Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2332.2 Cisco Web Security Appliance Privilege Escalation Vulnerability 10 August 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Web Security Appliance Publisher: Cisco Systems Operating System: Cisco Impact/Access: Root Compromise -- Existing Account Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-1359 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-scr-web-priv-esc-k3HCGJZ Revision History: August 10 2021: Added a new fixed release July 8 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Web Security Appliance Privilege Escalation Vulnerability Priority: High Advisory ID: cisco-sa-scr-web-priv-esc-k3HCGJZ First Published: 2021 July 7 16:00 GMT Last Updated: 2021 July 30 14:10 GMT Version 1.1: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvv81569 CVE Names: CVE-2021-1359 CWEs: CWE-112 Summary o A vulnerability in the configuration management of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to perform command injection and elevate privileges to root . This vulnerability is due to insufficient validation of user-supplied XML input for the web interface. An attacker could exploit this vulnerability by uploading crafted XML configuration files that contain scripting code to a vulnerable device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system and elevate privileges to root . An attacker would need a valid user account with the rights to upload configuration files to exploit this vulnerability. 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-scr-web-priv-esc-k3HCGJZ Affected Products o Vulnerable Products This vulnerability affects Cisco AsyncOS for Cisco WSA, 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: Email Security Appliance, both virtual and hardware appliances Content Security Management Appliance, both virtual and hardware appliances 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 Web Security Appliance First Fixed Release Major Release 11.8 and earlier 11.8.4-004 12.0 12.0.3-005 12.5 12.5.2 ^1 14.0 Not affected. 1. Release 12.5.2 will be a Maintenance Release (MR) a few days after the publication date of this security advisory. In most cases, the software can be upgraded over the network by using the System Upgrade options in the Cisco WSA web interface. 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 Cisco would like to thank Alvaro Gutierrez of mnemonic 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-scr-web-priv-esc-k3HCGJZ Revision History o +---------+-------------------------+--------------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+-------------------------+--------------+--------+-------------+ | 1.1 | Added a new fixed | Fixed | Final | 2021-JUL-30 | | | release. | Software | | | +---------+-------------------------+--------------+--------+-------------+ | 1.0 | Initial public release. | - | Final | 2021-JUL-07 | +---------+-------------------------+--------------+--------+-------------+ - --------------------------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 iQIVAwUBYRHlUeNLKJtyKPYoAQgo/BAAnPHExA441ZWUwqaf+nx2SvwEp2MK3RcM 5kwk7aQ7sg4XiArTn75+YbQ/gF58UKwCo92CEbSmNJKbP0mxl4zj3v2N3KjvkwHW HojJAPc22BMILxwpwpkfGlpSkAp0SA+N/XtLWlT35Rt/XSTPAjF+30mUvzVe7Xiv YNoU4BTol/2Jap4oQocKlfJl7KyiRwYFe5miEb0L//Yd2j7GJXbtXTvf7i7HQuXf 7DCGkA28dtKOFzTmjHUaLH+QWXVV0D8gcb/sMjUYXuth88wwhExvnbGgTovSFQUB 4HzyGOCGQb8QNJLHnNzAAe+yLhGdTts1J2Jq3HfdpABiVJVv8MrhJ+pMCHbd5MTH UGn61uJuUZ2lZmyz5oBHl8LENR2o9RFRVAywN4XMTWvfG6jf9kSfYMOdCarjnw1M /q1ajsQbUwXX9CzrlZmukiB/qTZTpfloim73InrJyWCudHbtN/ZBobE1ScS82iIR 2Qxz2BAug9gthVbCQFSWXQBqA8MTyrXZ7j/fhGf/jjV64R65DkaDa3G4EJGH8jIX YOpXTQFH8ouVUDlarsyXbbDARxrWUZ4Ulv3UTYRZaKnR5Isn/v/X/I9QNOJK13ic JOZSeyJlfXW2qy/akn7Olfy6alzVD0fXgFIInKXPTqwiMIRUUdK5P9JfmOHIvxxp oF0mMtyVqYE= =B9Lh -----END PGP SIGNATURE-----