Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1025 Cisco IOS XE Software Web UI multiple vulnerabilities 25 March 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XE Software Web UI Cisco IOS XE Software Web UI OS Publisher: Cisco Systems Operating System: Cisco Impact/Access: Root Compromise -- Existing Account Execute Arbitrary Code/Commands -- Existing Account Increased Privileges -- Existing Account Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-1443 CVE-2021-1435 CVE-2021-1403 CVE-2021-1356 CVE-2021-1220 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webcmdinjsh-UFJxTgZD https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-cswsh-FKk9AzT5 https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-z9yqYQAn https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-os-cmd-inj-Ef6TV5e9 Comment: This bulletin contains four (4) Cisco Systems security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOS XE Software Web UI Command Injection Vulnerability Priority: Medium Advisory ID: cisco-sa-iosxe-webcmdinjsh-UFJxTgZD First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvq32553 CVE Names: CVE-2021-1435 CWEs: CWE-22 CVSS Score: 6.6 AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X Summary o A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to inject arbitrary commands that can be executed as the root user. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted request to the web UI of an affected device with arbitrary commands injected into a portion of the request. 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-webcmdinjsh-UFJxTgZD Affected Products o Vulnerable Products At the time of publication, this vulnerability affected Cisco devices if they were running a vulnerable release of Cisco IOS XE Software and had the web UI feature enabled. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the HTTP Server Configuration To determine whether the HTTP Server feature is enabled for a device, log in to the device and use the show running-config | include ip http server| secure|active command in the CLI to check for the presence of the ip http server command or the ip http secure-server command in the global configuration. If either command is present and configured, the HTTP Server feature is enabled for the device. The following example shows the output of the show running-config | include ip http server|secure|active command for a device that has the HTTP Server feature enabled: Router# show running-config | include ip http server|secure|active ip http server ip http secure-server Note: The presence of either command or both commands in the device configuration indicates that the web UI feature is enabled. If the ip http server command is present and the configuration also contains ip http active-session-modules none , the vulnerability is not exploitable over HTTP. If the ip http secure-server command is present and the configuration also contains ip http secure-active-session-modules none , the vulnerability is not exploitable over HTTPS. 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 : [ ] [Check] 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 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-webcmdinjsh-UFJxTgZD Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE Software Web UI Cross-Site WebSocket Hijacking Vulnerability Priority: High Advisory ID: cisco-sa-iosxe-cswsh-FKk9AzT5 First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvu98441 CVE Names: CVE-2021-1403 CWEs: CWE-345 Summary o A vulnerability in the web UI feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a cross-site WebSocket hijacking (CSWSH) attack and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient HTTP protections in the web UI on an affected device. An attacker could exploit this vulnerability by persuading an authenticated user of the web UI to follow a crafted link. A successful exploit could allow the attacker to corrupt memory on the affected device, forcing it to reload and causing a DoS condition. 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-cswsh-FKk9AzT5 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 Cisco devices if they are running a vulnerable release of Cisco IOS XE Software and have the HTTP Server feature enabled. The default state of the HTTP Server feature in Cisco IOS XE Software is version and platform dependent. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the HTTP Server Configuration To determine whether the HTTP Server feature is enabled for a device, log in to the device and use the show running-config | include ip http server| secure|active command in the CLI to check for the presence of the ip http server command or the ip http secure-server command in the global configuration. If either command is present and configured, the HTTP Server feature is enabled for the device. The following example shows the output of the show running-config | include ip http server|secure|active command for a device that has the HTTP Server feature enabled: Router# show running-config | include ip http server|secure|active ip http server ip http secure-server Note: The presence of either command or both commands in the device configuration indicates that the web UI feature is enabled. If the ip http server command is present and the configuration also contains ip http active-session-modules none , the vulnerability is not exploitable over HTTP. If the ip http secure-server command is present and the configuration also contains ip http secure-active-session-modules none , the vulnerability is not exploitable over HTTPS. 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. Disabling the HTTP Server feature eliminates the attack vector for this vulnerability and may be a suitable mitigation until affected devices can be upgraded. To disable the HTTP Server feature, use the no ip http server or no ip http secure-server command in global configuration mode. If both the HTTP server and HTTPS server are in use, both commands are required to disable the HTTP Server feature. While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment. 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 : [ ] [Check] 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 Marcin Kopec, Fabian Beck, and Jiri Kulda of Deutsche Telekom 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. 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-cswsh-FKk9AzT5 Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE Software Web UI Denial of Service Vulnerabilities Priority: Medium Advisory ID: cisco-sa-xe-webui-dos-z9yqYQAn First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvu94117 CSCvu99729 CVE Names: CVE-2021-1220 CVE-2021-1356 CWEs: CWE-20 Summary o Multiple vulnerabilities in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker with read -only privileges to cause the web UI software to become unresponsive and consume vty line instances, resulting in a denial of service (DoS) condition. These vulnerabilities are due to insufficient error handling in the web UI. An attacker could exploit these vulnerabilities by sending crafted HTTP packets to an affected device. A successful exploit could allow the attacker to cause the web UI software to become unresponsive and consume all available vty lines, preventing new session establishment and resulting in a DoS condition. Manual intervention would be required to regain web UI and vty session functionality. Note: These vulnerabilities do not affect the console connection. 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-xe-webui-dos-z9yqYQAn Affected Products o Vulnerable Products At the time of publication, these vulnerabilities affected Cisco devices if they were running a vulnerable release of Cisco IOS XE Software and had the HTTP Server feature enabled. The default state of the HTTP Server feature in Cisco IOS XE Software is version and platform dependent. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the HTTP Server Configuration To determine whether the HTTP Server feature is enabled for a device, log in to the device and use the show running-config | include ip http server| secure|active command in the CLI to check for the presence of the ip http server command or the ip http secure-server command in the global configuration. If either command is present and configured, the HTTP Server feature is enabled for the device. The following example shows the output of the show running-config | include ip http server|secure|active command for a device that has the HTTP Server feature enabled: Router# show running-config | include ip http server|secure|active ip http server ip http secure-server Note: The presence of either command or both commands in the device configuration indicates that the web UI feature is enabled. If the ip http server command is present and the configuration also contains ip http active-session-modules none , these vulnerabilities are not exploitable over HTTP. If the ip http secure-server command is present and the configuration also contains ip http secure-active-session-modules none , these vulnerabilities are not exploitable over HTTPS. 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 XR Software NX-OS Software Indicators of Compromise o Unexpected idle vty sessions may be an indicator that these vulnerabilities have been exploited. Use the show user command to display console and vty sessions. The initial session that causes these vulnerabilities could appear as an idle vty connection with a valid username, such as user1 in the examples below. If the attack persists, additional idle vty sessions will be displayed in the Host(s) column as HTTP CP . The following example shows output from the show user command on a device that has been compromised: eWLC#show user Line User Host(s) Idle Location * 0 con 0 idle 00:00:00 2 vty 0 user1 idle 00:31:45 3 vty 1 HTTP CP 00:47:15 4 vty 2 HTTP CP 00:47:15 If the web UI is not responding and unexpected idle vty sessions are identified, the administrator may be able to clear these lines. Use the Idle time as an indicator and not the Host(s) value. Start at the first idle vty session and clear each line in succession until all have been cleared. All idle lines must be cleared before any listed sessions will disappear from the list. Once the last session is cleared, all of these vty lines should be freed. Use the clear line x command to clear the idle vty sessions. The vty line is the left-most number. In this example, the CLI command clear line 2 will clear the user1 user session: eWLC#clear line 2 Line User Host(s) Idle Location * 0 con 0 idle 00:00:00 2 vty 0 user1 idle 00:31:45 3 vty 1 HTTP CP 00:47:15 4 vty 2 HTTP CP 00:47:15 If the vty lines cannot be cleared, the device may need to be reloaded in order to restore the web UI and vty session functionality. Workarounds o There are no workarounds that address these vulnerabilities. Disabling the HTTP Server feature eliminates the attack vector for these vulnerabilities and may be a suitable mitigation until affected devices can be upgraded. To disable the HTTP Server feature, use the no ip http server or no ip http secure-server command in global configuration mode. If both the HTTP server and HTTPS server are in use, both commands are required to disable the HTTP Server feature. While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment. 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 : [ ] [Check] 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 vulnerabilities that are described in this advisory. Source o Cisco would like to thank Marcin Kopec, Fabian Beck, and Jiri Kulda from Deutsche Telekom for reporting these vulnerabilities. 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-xe-webui-dos-z9yqYQAn Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-MAR-24 | +----------+---------------------------+----------+--------+--------------+ - -------------------------------------------------------------------------------- Cisco IOS XE Software Web UI OS Command Injection Vulnerability Priority: Medium Advisory ID: cisco-sa-ios-xe-os-cmd-inj-Ef6TV5e9 First Published: 2021 March 24 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvu60249 CVE Names: CVE-2021-1443 CWEs: CWE-77 Summary o A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to execute arbitrary code with root privileges on the underlying operating system of an affected device. The vulnerability exists because the affected software improperly sanitizes values that are parsed from a specific configuration file. An attacker could exploit this vulnerability by tampering with a specific configuration file and then sending an API call. A successful exploit could allow the attacker to inject arbitrary code that would be executed on the underlying operating system of the affected device. To exploit this vulnerability, the attacker would need to have a privileged set of credentials to the device. 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-ios-xe-os-cmd-inj-Ef6TV5e9 Affected Products o Vulnerable Products At the time of publication, this vulnerability affected Cisco devices if they were running a vulnerable release of Cisco IOS XE Software and had the HTTP Server feature enabled. The default state of the HTTP Server feature in Cisco IOS XE Software is version and platform dependent. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the HTTP Server Configuration To determine whether the HTTP Server feature is enabled for a device, log in to the device and use the show running-config | include ip http server| secure|active command in the CLI to check for the presence of the ip http server command or the ip http secure-server command in the global configuration. If either command is present and configured, the HTTP Server feature is enabled for the device. The following example shows the output of the show running-config | include ip http server|secure|active command for a device that has the HTTP Server feature enabled: Router# show running-config | include ip http server|secure|active ip http server ip http secure-server Note: The presence of either command or both commands in the device configuration indicates that the web UI feature is enabled. If the ip http server command is present and the configuration also contains ip http active-session-modules none , the vulnerability is not exploitable over HTTP. If the ip http secure-server command is present and the configuration also contains ip http secure-active-session-modules none , the vulnerability is not exploitable over HTTPS. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Workarounds o There are no workarounds that address this vulnerability. Disabling the HTTP Server feature eliminates the attack vector for this vulnerability and may be a suitable mitigation until affected devices can be upgraded. To disable the HTTP Server feature, use the no ip http server or no ip http secure-server command in global configuration mode. If both the HTTP server and HTTPS server are in use, both commands are required to disable the HTTP Server feature. While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment. 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 : [ ] [Check] 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 This vulnerability was found by X.B. 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-ios-xe-os-cmd-inj-Ef6TV5e9 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. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYFvoqeNLKJtyKPYoAQgL4w//RRzhB+yojnSTyrJrLFPgRvWsRBuLhzhv G/PZGU0s7B3WU27XzSBcspbYqsc8sRWzazsQ2yIbgvuUaJPZfG5jc3COwbguLsJL lh15k1J6AXjwNaiP8R6WrvtHLChTGxObilEHIXTCke76rlzAGMtpa2Cu0UTc7y1I s8jVL9PBLQo5tLhErcI19KLjLueqh6dxg9ca13aS2sYqzBr3MsKA2bhh5IeA/7/9 g3EOnd+ohnKWNxGJUBdR1P7lkBIyAXsWXU1gq2wuJ2pB2YugiX+bU6OsYLfdL0Be pmdfVUFnvrGkfB6p0fesgW6t521qmT38Eei9GRCsXmreIpPuv7cgOvzWLvNsPABT p8O2+ukUgGdD+FWfhXF9f8s5US6i5JiqYAK81HCS9AIdPKDFRmwS1gAtBkQHcI3c p+XSSUMnQeO77ujZCGxppJNH9FhZ3q6LNRT+e392lf/7WrpfiGoJ6gRUuzen+Q0q 2A00GDFMedH/WSxlBDgGhPCTmoEDRqOib+BcdJYOPkWpNZ6ItxSSshVubQDtZuQm lDAbPkxEC+PCrhuu5bjzNzIsbDNaFHw0xvnkpjmeR2jrJuahYVVNKEjQXUl778cX cwMjbFzvmiVZDAdfy3OBN0ocIUiYN/JdkrZgJeDKYELbOZyWdObcqOR/yr2oQdpA jxfDqtPdpXw= =v5fP -----END PGP SIGNATURE-----