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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4102.2 Cisco Secure Web Appliance Privilege Escalation Vulnerability 22 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Secure Web Appliance Publisher: Cisco Systems Operating System: Cisco Impact/Access: Root Compromise -- Existing Account Increased Privileges -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-3367 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-prv-esc-nPzWZrQj Revision History: January 22 2021: Vendor updated fixed software section November 19 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Secure Web Appliance Privilege Escalation Vulnerability Priority: High Advisory ID: cisco-sa-wsa-prv-esc-nPzWZrQj First Published: 2020 November 18 16:00 GMT Last Updated: 2021 January 21 14:53 GMT Version 1.1: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvs65863 CVE Names: CVE-2020-3367 CWEs: CWE-78 CVSS Score: 5.3 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X Summary o A vulnerability in the log subscription subsystem of Cisco AsyncOS for the Cisco Secure Web Appliance (formerly Web Security Appliance) could allow an authenticated, local attacker to perform command injection and elevate privileges to root . This vulnerability is due to insufficient validation of user-supplied input for the web interface and CLI. An attacker could exploit this vulnerability by authenticating to the affected device and injecting scripting commands in the scope of the log subscription subsystem. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system and elevate privileges to root . 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-wsa-prv-esc-nPzWZrQj Affected Products o Vulnerable Products This vulnerability affects Cisco AsyncOS for the Secure Web Appliance, both virtual and hardware appliances. For 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: Secure Email (formerly Email Security Appliance), both virtual and hardware appliances Secure Email and Web Manager (formerly Security Management Appliance), both virtual and hardware appliances Details o Simplifying the Cisco portfolio includes the renaming of security products under one brand: Cisco Secure. For more information, see Meet Cisco Secure . 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 Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table: Cisco AsyncOS for Secure Web Appliance Major Release First Fixed Release 10.1 and earlier 10.1.5-037 10.5 11.7.2-011 11.5 11.7.2-011 11.7 11.7.2-011 11.8 11.8.2-009 12.0 12.0.2-004 12.5 12.5.1-011 In most cases, the software can be upgraded over the network by using the System Upgrade options in the web interface of the Secure Web Appliance. To upgrade a device by using the web interface, do the following: 1. Choose System Administration > System Upgrade . 2. Click Upgrade Options . 3. Choose Download and Install . 4. Choose the release to upgrade to. 5. In the Upgrade Preparation area, choose the appropriate options. 6. Click Proceed to begin the upgrade. A progress bar displays the status of the upgrade. After the upgrade is complete, the device reboots. 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 Alvaro Gutierrez Quiles 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-wsa-prv-esc-nPzWZrQj Revision History o +---------+-----------------------------+----------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+-----------------------------+----------+--------+-------------+ | | Added new fix information | | | | | | for releases 10.1 and | Fixed | | | | 1.1 | earlier. Updated the fixed | Software | Final | 2021-JAN-21 | | | release number for Release | | | | | | 12.0. | | | | +---------+-----------------------------+----------+--------+-------------+ | 1.0 | Initial public release. | - | Final | 2020-NOV-18 | +---------+-----------------------------+----------+--------+-------------+ - --------------------------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). 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