Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3503.2 Cisco IOS XE SD-WAN Software Command Injection Vulnerability 22 February 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XE SD-WAN Software Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2021-1529 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-rhpbE34A Comment: CVSS (Max): 7.8 CVE-2021-1529 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVSS Source: NVD Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Revision History: February 22 2022: Updated metadata to add affected releases to CVRF data October 21 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOS XE SD-WAN Software Command Injection Vulnerability Priority: High Advisory ID: cisco-sa-sd-wan-rhpbE34A First Published: 2021 October 20 16:00 GMT Last Updated: 2022 February 17 18:13 GMT Version 1.1: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvx50713 CVE Names: CVE-2021-1529 CWEs: CWE-78 Summary o A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges. The vulnerability is due to insufficient input validation by the system CLI. An attacker could exploit this vulnerability by authenticating to an affected device and submitting crafted input to the system CLI. A successful exploit could allow the attacker to execute commands on the underlying operating system 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-sd-wan-rhpbE34A Affected Products o Vulnerable Products This vulnerability affects the following Cisco products if they are running a vulnerable release of universal Cisco IOS XE Software in Controller mode or a vulnerable release of standalone Cisco IOS XE SD-WAN Software: 1000 Series Integrated Services Routers (ISRs) 4000 Series ISRs ASR 1000 Series Aggregation Services Routers Catalyst 8000 Series Edge Platforms Cloud Services Router (CSR) 1000V Series For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Note : The standalone Cisco IOS XE SD-WAN release images are separate from the universal Cisco IOS XE Software release images. The SD-WAN feature was first integrated into universal Cisco IOS XE Software with Release 17.2.1r. For more information, see the Cisco SD-WAN Getting Started Guide . Determine the Device Configuration There are two methods for determining whether the Controller mode is enabled on a device that is running universal Cisco IOS XE Software. A device must be in Controller mode to use the Cisco SD-WAN feature. Option 1: Use the show running-config | include sdwan Command To determine whether the Controller mode is enabled on a device, use the show running-config | include sdwan command and check tunnel mode in the output. If the command returns tunnel mode sdwan , the SD-WAN feature is enabled. Therefore, the device is in Controller mode and is vulnerable. If the command returns no output or the command does not exist, 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 is in Controller mode: 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 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 is in Controller mode: 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. Universal Cisco IOS XE Software releases earlier than Release 17.2.1r are not affected by this vulnerability because they do not include the SD-WAN feature. Cisco has confirmed that this vulnerability does not affect the following Cisco products: IOS Software IOS XE Software that is running in Autonomous Mode SD-WAN vBond Orchestrator Software SD-WAN vEdge Cloud Routers 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 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. Fixed Releases Standalone IOS XE SD-WAN Software Cisco has not released and will not release updates to standalone Cisco IOS XE SD-WAN Software to address the vulnerability described in this advisory. Customers are advised to upgrade to a universal Cisco IOS XE Software release. Universal IOS XE Software Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table(s): Cisco IOS XE Universal Release First Fixed Release 16.12 and earlier Not vulnerable 17.2 17.2.3 17.3 17.3.4 17.4 17.4.2 17.5 17.5.1a 17.6 17.6.1 The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory. Exploitation and Public Announcements o The Cisco 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 Julien Legras of Synacktiv 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-sd-wan-rhpbE34A Revision History o +---------+------------------------------+---------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+------------------------------+---------+--------+-------------+ | | Updated metadata to add | | | | | 1.1 | affected releases to CVRF | - | Final | 2022-FEB-17 | | | data. | | | | +---------+------------------------------+---------+--------+-------------+ | 1.0 | Initial public release. | - | Final | 2021-OCT-20 | +---------+------------------------------+---------+--------+-------------+ - --------------------------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 iQIVAwUBYhQ4U+NLKJtyKPYoAQgQ0Q//XkpGNJaN66g8JsU9LJFM4yHKRODjhqGT nXI+20DhuaJi/mR0IAfpaQQL0Ra0nV9EWQ3vrdp+i9qcnHqn43Se6RdrErj2+QSc hp07V9MNyR1713/bI4mZ08FxDv+EIdSOZG/4vAULtFvn9iW0wBBsAOxPCMyM1p4g 6Cpwikk41QyN7ZB3BPsekYUp5XG2qV8MX/z1fARSCbaHsZmkcLkpe/I3pXTBuXyY Y/OQs+ePQ7+b3ilHc4zJ5ND+VTDDFrJvoFE+FmzFQ5vWChZZ7TJ9Iltxi6wMK4GK zl8rL/tjmQOcsESZXb+Q4oZN1Jud8TPwV0x4YuEWPFAIyHa4RLRfmWngZ0a9hcVw Grjm7INkvaSLCh9NPM3AIzQKaQJ7cRTHugx/I7VQ50Etzc1SjjdJpY1OXtIIUn5w AIyMeUF5z7PoF09uYTFqhDHZkgSioAIZq8jqgAcpswpBMMM/9bGsYyQzC8Q+1N8z fjDXWDlE4XFrU4g6+yCNaO5vSwMouwGhUsF44JXpz412fuOEoT0RuiTIfaG/SobP oj/yhQNNQzln+pqMnMIyh4Fzu7fR9YgN40YYu8iDMY9ulLBbGtgnUf6CX6SMOF+h IyJkUdZNZGuMnMCAXeZRHeeB9HEBsXM6nhOsasu7nOe3SBpm9+0Y0kag/y6UoUX0 CzahHpmG5nA= =3ckb -----END PGP SIGNATURE-----