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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1033 Cisco IOS XE SD-WAN Software multiple vulnerabilities 25 March 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XE SD-WAN Publisher: Cisco Systems Operating System: Cisco Impact/Access: Root Compromise -- Existing Account Execute Arbitrary Code/Commands -- Existing Account Overwrite Arbitrary Files -- Existing Account Read-only Data Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-1454 CVE-2021-1436 CVE-2021-1434 CVE-2021-1432 CVE-2021-1383 CVE-2021-1382 CVE-2021-1281 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-clipriv-9TO2QGVp https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwpathtrav-nsrue2Mt https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xesdwpinj-V4weeqzU https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xesdwcinj-t68PPW7m https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-arbfile-FUxskKDE https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwarbcmdexec-sspOMUr3 Comment: This bulletin contains six (6) Cisco Systems security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOS XE SD-WAN Software Privilege Escalation Vulnerability Priority: Medium Advisory ID: cisco-sa-sdwan-clipriv-9TO2QGVp First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvv65659 CVE Names: CVE-2021-1281 CWEs: CWE-399 Summary o A vulnerability in CLI management in Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to access the underlying operating system as the root user. This vulnerability is due to the way the software handles concurrent CLI sessions. An attacker could exploit this vulnerability by authenticating to the device as an administrative user and executing a sequence of commands. A successful exploit could allow the attacker to obtain access to the underlying operating system as the root user. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-clipriv-9TO2QGVp Affected Products o Vulnerable Products At the time of publication, this vulnerability affected universal Cisco IOS XE Software earlier than the first fixed release if it was running in Controller mode. At the time of publication, this vulnerability affected all standalone Cisco IOS XE SD-WAN Software releases earlier than the first fixed release. Note: The standalone Cisco IOS XE SD-WAN release images are separate from the universal Cisco IOS XE Software releases. The SD-WAN feature set was first integrated into the universal Cisco IOS XE Software releases starting with IOS XE Software Release 17.2.1r. For additional information, see the Install and Upgrade Cisco IOS XE Release 17.2.1r and Later chapter of the Cisco SD-WAN Getting Started Guide . For additional information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: IOS Software IOS XE Software in autonomous mode SD-WAN vBond Orchestrator Software SD-WAN vEdge Routers SD-WAN vManage Software SD-WAN vSmart Controller Software Workarounds o There are no workarounds that address this vulnerability. Fixed Software o When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page , to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Cisco IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified ("Combined First Fixed"). Customers can use the Cisco Software Checker to search advisories in the following ways: Choose the software and one or more releases Upload a .txt file that includes a list of specific releases Enter the output of the show version command After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S. By default, the Cisco Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search. Standalone Cisco IOS XE SD-WAN Software At the time of publication, standalone Cisco IOS XE SD-WAN Software releases 16.12(5) and later contained the fix for this vulnerability. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o This vulnerability was found by Daemon Yang of Cisco during internal security testing. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-clipriv-9TO2QGVp Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE SD-WAN Software Path Traversal Vulnerability Priority: Medium Advisory ID: cisco-sa-iosxe-sdwpathtrav-nsrue2Mt First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvu28373 CVE Names: CVE-2021-1436 CWEs: CWE-22 Summary o A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to conduct path traversal attacks and obtain read access to sensitive files on an affected system. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to an affected system. A successful exploit could allow the attacker to view arbitrary files on the affected system. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwpathtrav-nsrue2Mt Affected Products o Vulnerable Products At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco IOS XE SD-WAN Software and had the SD-WAN feature enabled. The SD-WAN feature is not enabled by default. 1000 Series Integrated Services Routers (ISRs) 4000 Series ISRs ASR 1000 Series Aggregation Services Routers Cloud Services Router 1000V Series For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. Determine the Device Configuration There are two methods for determining whether the SD-WAN feature is enabled on a device: Option 1: Use the show running-config | include sdwan Command To determine whether sdwan mode is enabled on a device, use the show running-config | include sdwan command and check the tunnel mode in the output. If the command returns tunnel mode sdwan , the sdwan feature is enabled and the device is vulnerable. If the command returns no output or the command does not exist, the SD-WAN feature is not enabled and the device is not affected by this vulnerability. The following example shows the output of the show running-config | include sdwan command on a device that has the SD-WAN feature enabled: Router# show running-config | include sdwan tunnel mode sdwan Router# Option 2: Use the show version Command Alternatively, use the show version command to determine whether the Cisco IOS XE device is in Controller mode. The end of the output includes the router operating mode, which indicates whether the device is in Controller mode. The following example shows part of the show version command output on a device that has the SD-WAN feature enabled: Router# show version . . . Router operating mode: Controller-Managed . . . Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: IOS Software IOS XR Software NX-OS Software Workarounds o There are no workarounds that address this vulnerability. Fixed Software o When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page , to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Cisco IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified ("Combined First Fixed"). Customers can use the Cisco Software Checker to search advisories in the following ways: Choose the software and one or more releases Upload a .txt file that includes a list of specific releases Enter the output of the show version command After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S. By default, the Cisco Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search. For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes , Cisco IOS XE 3S Release Notes , or Cisco IOS XE 3SG Release Notes , depending on the Cisco IOS XE Software release. Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o This vulnerability was found by James Spadaro III of Cisco during internal security testing. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwpathtrav-nsrue2Mt Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE SD-WAN Software Parameter Injection Vulnerabilities Priority: Medium Advisory ID: cisco-sa-xesdwpinj-V4weeqzU First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvk59304 CSCvw64834 CVE Names: CVE-2021-1383 CVE-2021-1454 CWEs: CWE-20 CWE-88 Summary o Multiple vulnerabilities in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to access the underlying operating system with root privileges. These vulnerabilities are due to insufficient input validation of certain CLI commands. An attacker could exploit these vulnerabilities by authenticating to the device and submitting crafted input to the CLI. The attacker must be authenticated as an administrative user to execute the affected commands. A successful exploit could allow the attacker to access the underlying operating system with root privileges. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xesdwpinj-V4weeqzU Affected Products o Vulnerable Products At the time of publication, these vulnerabilities affected universal Cisco IOS XE Software earlier than the first fixed release if it was running in Controller mode. At the time of publication, these vulnerabilities affected all standalone Cisco IOS XE SD-WAN Software releases . Note: The standalone Cisco IOS XE SD-WAN Software release images are separate from the universal Cisco IOS XE Software releases. The SD-WAN feature set was first integrated into the universal Cisco IOS XE Software releases starting with Cisco IOS XE Software Release 17.2.1r. For additional information, see the Install and Upgrade Cisco IOS XE Release 17.2.1r and Later chapter of the Cisco SD-WAN Getting Started Guide . For additional information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by these vulnerabilities. Cisco has confirmed that these vulnerabilities do not affect the following Cisco products: IOS Software IOS XE Software in autonomous mode SD-WAN vBond Orchestrator Software SD-WAN vEdge Routers SD-WAN vManage Software SD-WAN vSmart Controller Software Workarounds o There are no workarounds that address these vulnerabilities. Fixed Software o When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page , to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Cisco IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified ("Combined First Fixed"). Customers can use the Cisco Software Checker to search advisories in the following ways: Choose the software and one or more releases Upload a .txt file that includes a list of specific releases Enter the output of the show version command After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S. By default, the Cisco Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search. Standalone Cisco IOS XE SD-WAN Software Cisco will not fix these vulnerabilities in standalone Cisco IOS XE SD-WAN Software releases. Customers who are running a standalone release must upgrade to a universal Cisco IOS XE Software release to address these vulnerabilities. The SD-WAN feature set was first integrated into the universal Cisco IOS XE Software releases starting with Cisco IOS XE Software Release 17.2.1r. For additional information, see the Install and Upgrade Cisco IOS XE Release 17.2.1r and Later chapter of the Cisco SD-WAN Getting Started Guide . Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory. Source o Cisco would like to thank Orange Group for reporting the vulnerability that is described in CVE-2021-1383. The vulnerability that is described in CVE-2021-1454 was found by Cisco during internal security testing. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xesdwpinj-V4weeqzU Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE SD-WAN Software Command Injection Vulnerability Priority: Medium Advisory ID: cisco-sa-xesdwcinj-t68PPW7m First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvw64828 CVE Names: CVE-2021-1382 CWEs: CWE-77 Summary o A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to inject arbitrary commands to be executed with root privileges on the underlying operating system. This vulnerability is due to insufficient input validation on certain CLI commands. An attacker could exploit this vulnerability by authenticating to the device and submitting crafted input to the CLI. The attacker must be authenticated as an administrative user to execute the affected commands. A successful exploit could allow the attacker to execute commands with root privileges. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xesdwcinj-t68PPW7m Affected Products o Vulnerable Products At the time of publication, this vulnerability affected universal Cisco IOS XE Software releases 17.3.1 and later (but earlier than the first fixed release) if they were running in Controller mode. At the time of publication, this vulnerability did not affect standalone Cisco IOS XE SD-WAN Software releases. Note: The standalone Cisco IOS XE SD-WAN release images are separate from the universal Cisco IOS XE Software releases. The SD-WAN feature set was first integrated into the universal Cisco IOS XE Software releases starting with IOS XE Software Release 17.2.1r. For additional information, see the Install and Upgrade Cisco IOS XE Release 17.2.1r and Later chapter of the Cisco SD-WAN Getting Started Guide . For additional information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: IOS Software IOS XE Software in autonomous mode SD-WAN vBond Orchestrator Software SD-WAN vEdge Routers SD-WAN vManage Software SD-WAN vSmart Controller Software Standalone Cisco IOS XE SD-WAN Software Workarounds o There are no workarounds that address this vulnerability. Fixed Software o When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page , to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Cisco IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified ("Combined First Fixed"). Customers can use the Cisco Software Checker to search advisories in the following ways: Choose the software and one or more releases Upload a .txt file that includes a list of specific releases Enter the output of the show version command After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S. By default, the Cisco Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search. Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o Cisco would like to thank Orange Group for reporting this vulnerability. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xesdwcinj-t68PPW7m Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE SD-WAN Software Arbitrary File Corruption Vulnerability Priority: Medium Advisory ID: cisco-sa-iosxe-arbfile-FUxskKDE First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvu39228 CVE Names: CVE-2021-1434 CWEs: CWE-552 Summary o A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to overwrite arbitrary files in the underlying file system. This vulnerability is due to insufficient validation of the parameters of a specific CLI command. An attacker could exploit this vulnerability by issuing that command with specific parameters. A successful exploit could allow the attacker to overwrite the content of any arbitrary file that resides on the underlying host file system. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-arbfile-FUxskKDE Affected Products o Vulnerable Products At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco IOS XE SD-WAN Software and had the SD-WAN feature enabled. The SD-WAN feature is not enabled by default. 1000 Series Integrated Services Routers (ISRs) 4000 Series ISRs ASR 1000 Series Aggregation Services Routers Cloud Services Router 1000V Series For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. Determine the Device Configuration There are two methods for determining whether the SD-WAN feature is enabled on a device: Option 1: Use the show running-config | include sdwan Command To determine whether sdwan mode is enabled on a device, use the show running-config | include sdwan command and check the tunnel mode in the output. If the command returns tunnel mode sdwan , the sdwan feature is enabled and the device is vulnerable. If the command returns no output or the command does not exist, the SD-WAN feature is not enabled and the device is not affected by this vulnerability. The following example shows the output of the show running-config | include sdwan command on a device that has the SD-WAN feature enabled: Router# show running-config | include sdwan tunnel mode sdwan Router# Option 2: Use the show version Command Alternatively, use the show version command to determine whether the Cisco IOS XE device is in Controller mode. The end of the output includes the router operating mode, which indicates whether the device is in Controller mode. The following example shows part of the show version command output on a device that has the SD-WAN feature enabled: Router# show version . . . Router operating mode: Controller-Managed . . . Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: IOS Software IOS XR Software NX-OS Software Workarounds o There are no workarounds that address this vulnerability. Fixed Software o When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page , to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Cisco IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified ("Combined First Fixed"). Customers can use the Cisco Software Checker to search advisories in the following ways: Choose the software and one or more releases Upload a .txt file that includes a list of specific releases Enter the output of the show version command After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S. By default, the Cisco Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search. For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes , Cisco IOS XE 3S Release Notes , or Cisco IOS XE 3SG Release Notes , depending on the Cisco IOS XE Software release. Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o This vulnerability was found during the resolution of a Cisco TAC support case. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-arbfile-FUxskKDE Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE SD-WAN Software Arbitrary Command Execution Vulnerability Priority: High Advisory ID: cisco-sa-iosxe-sdwarbcmdexec-sspOMUr3 First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvu50633 CVE Names: CVE-2021-1432 CWEs: CWE-20 Summary o A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system as the root user. The attacker must be authenticated on the affected device as a low-privileged user to exploit this vulnerability. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by injecting arbitrary commands to a file as a lower-privileged user. The commands are then executed on the device by the root user. A successful exploit could allow the attacker to execute arbitrary commands as the root user. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwarbcmdexec-sspOMUr3 This advisory is part of the March 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication . Affected Products o Vulnerable Products This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco IOS XE SD-WAN Software and have the SD-WAN feature enabled. The SD-WAN feature is not enabled by default. 1000 Series Integrated Services Routers (ISRs) 4000 Series ISRs ASR 1000 Series Aggregation Services Routers Cloud Services Router 1000V Series For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the Device Configuration There are two methods for determining whether the SD-WAN feature is enabled on a device: Option 1: Use the show running-config | include sdwan Command To determine whether sdwan mode is enabled on a device, use the show running-config | include sdwan command and check the tunnel mode in the output. If the command returns tunnel mode sdwan , the sdwan feature is enabled and the device is vulnerable. If the command returns no output or the command does not exist, the SD-WAN feature is not enabled and the device is not affected by this vulnerability. The following example shows the output of the show running-config | include sdwan command on a device that has the SD-WAN feature enabled: Router# show running-config | include sdwan tunnel mode sdwan Router# Option 2: Use the show version Command Alternatively, use the show version command to determine whether the Cisco IOS XE device is in Controller mode. The end of the output includes the router operating mode, which indicates whether the device is in Controller mode. The following example shows part of the show version command output on a device that has the SD-WAN feature enabled: Router# show version . . . Router operating mode: Controller-Managed . . . Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: IOS Software IOS XR Software NX-OS Software Workarounds o There are no workarounds that address this vulnerability. Fixed Software o Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page , to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Customers Without Service Contracts Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c /en/us/support/web/tsd-cisco-worldwide-contacts.html Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Cisco IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified ("Combined First Fixed"). Customers can use the Cisco Software Checker to search advisories in the following ways: Choose the software and one or more releases Upload a .txt file that includes a list of specific releases Enter the output of the show version command After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S. By default, the Cisco Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search. For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes , Cisco IOS XE 3S Release Notes , or Cisco IOS XE 3SG Release Notes , depending on the Cisco IOS XE Software release. Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o This vulnerability was found by Andrew Kim of Cisco during internal security testing. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. Related to This Advisory o Cisco Event Response: March 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwarbcmdexec-sspOMUr3 Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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