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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2023.1726 Cisco IOS XE Software Web UI Path Traversal Vulnerability 23 March 2023 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XE Software Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2023-20066 Original Bulletin: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-pthtrv-es7GSb9V Comment: CVSS (Max): 6.5 CVE-2023-20066 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) CVSS Source: Cisco Systems Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOS XE Software Web UI Path Traversal Vulnerability Priority: Medium Advisory ID: cisco-sa-webui-pthtrv-es7GSb9V First Published: 2023 March 22 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCwc76009 CVE Names: CVE-2023-20066 Summary o A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to perform a directory traversal and access resources that are outside the filesystem mountpoint of the web UI. This vulnerability is due to an insufficient security configuration. An attacker could exploit this vulnerability by sending a crafted request to the web UI. A successful exploit could allow the attacker to gain read access to files that are outside the filesystem mountpoint of the web UI. Note: These files are located on a restricted filesystem that is maintained for the web UI. There is no ability to write to any files on this filesystem. 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-pthtrv-es7GSb9V This advisory is part of the March 2023 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 2023 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication . Affected Products o Vulnerable Products At the time of publication, this vulnerability affected Cisco IOS XE Software if it had the web UI enabled. For information about which Cisco software releases were vulnerable at the time of publication, 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, 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 Meraki products 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 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 . This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities that are described in all the advisories that the Software Checker identifies ("Combined First Fixed"). To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to determine whether a release is affected by any Cisco Security Advisory. To use the form, follow these steps: 1. Choose which advisories the tool will search-only this advisory, only advisories with a Critical or High Security Impact Rating (SIR) , or all advisories. 2. Enter a release number-for example, 15.9(3)M2 or 17.3.3. 3. Click Check . 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 Elias Ikkela-Koski 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. Subscribe to Cisco Security Notifications o Subscribe Related to This Advisory o Cisco Event Response: March 2023 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication URL o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-pthtrv-es7GSb9V Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2023-MAR-22 | +----------+---------------------------+----------+--------+--------------+ Legal Disclaimer o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBZBu4DMkNZI30y1K9AQgMpg/9GzH8FxfnJ+LAr8k2QRK9ADCOfIkoOEX1 IXwF+jxxQ1kC8XNK/6csV1SyVXW3CkfEL6KUiff8ozaRKsBykMmcWvUrFsMqNvWA nDCEslj0d5zFy5KLMKEG0pPpvbobfGVGqaD5SLwnbQw6GxoxOtT716F7fXuqiXDN Ixt8SIwpZ2fnSoZ38T56Lj1YGUiYZAogra2/no3gQ94z6e7fWpuKO3dtvAhW0kWL fzXlIwjsbZEnSzEsLTm5ugL1rNqtG/hgOYA9jPLoSsPPz+in0VIQzSnc0uz4hlnI rgvgjpAe/0J/h5Nu1E6F+Frbvw78ZQKRHzl2F/EsNO+ivM+Oc485AJm0z1wmeLIA /UZuQzVImvrkCGRuQLd3eE8TYAP37EeO8hBmHOh/RoKWhQMCdTJlcPXDWyZx6oUP GSo6e86NHqpB+uk8q1LJDWUwrWblFqFGaVcCvsoIxUh+9r4A29LhPZed0Ig/HSJq 27AEMRKmtc19ndnEHbEd0NtAlVU1rgt6kodea0v51PZa3ybjzS9Z1q1gJp3aAs+0 X9OFrBxKf4QBBJJwPljzuNUp5dhNcf3k6eSmzo9Dde+OwlVomblXuwACzATawla/ QaPWqtlH8GT7wEvp3AhbNchbVC+AWd1/L3qsSv8W5B80kl4IVW3HM8glh3CTFlwZ pBgH1h3yaXk= =o7Jb -----END PGP SIGNATURE-----