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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4826 Cisco IOS XE Software Web UI Command Injection Vulnerability 29 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XE Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2022-20851 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-cmdinj-Gje47EMn Comment: CVSS (Max): 5.5 CVE-2022-20851 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N) CVSS Source: Cisco Systems Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOS XE Software Web UI Command Injection Vulnerability Priority: Medium Advisory ID: cisco-sa-webui-cmdinj-Gje47EMn First Published: 2022 September 28 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvz74822 CVE Names: CVE-2022-20851 CWEs: CWE-77 Summary o A vulnerability in the web UI feature of Cisco IOS XE Software could allow an authenticated, remote attacker to perform an injection attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web UI API. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with root privileges. To exploit this vulnerability, an attacker must have valid Administrator privileges on the affected 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-webui-cmdinj-Gje47EMn This advisory is part of the September 2022 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: September 2022 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 products 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, 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 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. Related to This Advisory o Cisco Event Response: September 2022 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-cmdinj-Gje47EMn Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2022-SEP-28 | +----------+---------------------------+----------+--------+--------------+ - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYzTyHMkNZI30y1K9AQgzrhAAt0VMUJya5xr/nJU5vw/VLDJaWh6F1e4x d1NHtyd2BHNHjaZJZ83TxaB8aLZZkbrKSZQ4xQgDrRYHfYthlmMpF5T6d+lZEc8j GIXHMUV9/dKO1Q5+N/Gl11Qy19YM/QcGCHQ4K5gGKg1sYJZHA0Bp0eRvdOJmxDnt ojDLBlmd97cFLE3G6oe5chVdlMinLbXjEZXi8SDZQ3E2+RQK1g92vsLXBRm4HFEi qSb7CVe0yX9arxfcR+FnTa5PGKuMB4PsYIYJsvRidU2+uX9yv48y+GP5IjUs6wVO CfrrM5jrAWwvLtz+lBKPBDK7WNzfSHZ0tpP15UrVZMhzICkzUtUd4VP1hxkCV4jP /wS7OSuq+OdmbfopDDyeNvF3ukO78mtngtQW8NsQD4zjyG/Z+1t3NSUYULk3l+Rv wtT6F3exnbLuHgBIpT9tHb8QwlIOOnEOf/oXxxdV9ZMbL7tfD9wKDDvG0dAIEQZY +ZvGAuk9lBQnGE73E2JlLBzEbrTCJENmdCTTd61V5LDDG9naoqsZcdyrzpxHO/Fk mnxsMnSp3WTHq5Ft3ejv0eLfD2cJFiJV8y4lNpXQRj7oesKnyf4xyZ8wph96Etiu UtrqI1sWidZEsxUr76/olvcV/v0JOTsnCxhyVY+gmV1yix0deXN5vk54akI2f3Wk jGh/rnhggmk= =YYFn -----END PGP SIGNATURE-----