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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1467.2 Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability 5 July 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Series Integrated Services Routers (ISRs) Series Industrial Security Appliances (ISAs) Catalyst 8xxx Products Cloud Services Router 1000V Series Firepower Threat Defense (FTD) Software Integrated Services Virtual Router (ISRv) Open Source Snort 2 Publisher: Cisco Systems Operating System: Cisco Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-1495 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http-fp-bp-KfDdcQhc Revision History: July 5 2021: Added vulnerability CVE-2021-1494 April 29 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- TITLE: Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerabilities Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerabilities Priority: Medium Advisory ID: cisco-sa-http-fp-bp-KfDdcQhc First Published: 2021 April 28 16:00 GMT Last Updated: 2021 May 20 18:51 GMT Version 1.1: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvv70864 CSCvw19272 CSCvw26645 CSCvw59055 CVE Names: CVE-2021-1494 CVE-2021-1495 CWEs: CWE-693 Summary o Multiple Cisco products are affected by vulnerabilities in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. These vulnerabilities are due to incorrect handling of specific HTTP header parameters. An attacker could exploit these vulnerabilities by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file policy for HTTP packets and deliver a malicious payload. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http-fp-bp-KfDdcQhc Affected Products o Vulnerable Products At the time of publication, these vulnerabilities affected all open source Snort project releases earlier than Release 2.9.17.1. For more information on open source Snort, see the Snort website . At the time of publication, these vulnerabilities affected the following Cisco products if they were running a vulnerable release of Cisco UTD Snort IPS Engine Software for Cisco IOS XE Software or Cisco UTD Engine for Cisco IOS XE SD-WAN Software and were configured with a Snort HTTP Detection Engine File Policy: 1000 Series Integrated Services Routers (ISRs) 3000 Series Industrial Security Appliances (ISAs) 4000 Series Integrated Services Routers (ISRs) Catalyst 8000V Edge Software Catalyst 8200 Series Edge Platforms Catalyst 8300 Series Edge Platforms Catalyst 8500L Series Edge Platforms Cloud Services Router 1000V Series Firepower Threat Defense (FTD) Software Integrated Services Virtual Router (ISRv) Open Source Snort 2 For information about which Cisco software releases were vulnerable at the time of release, 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 these vulnerabilities. Cisco has confirmed that these vulnerabilities do not affect the following Cisco products: Adaptive Security Appliance (ASA) Software Catalyst 8500 Series Edge Platforms Firepower Management Center (FMC) Software Meraki Security Appliances Open Source Snort 3 Workarounds o There are no workarounds that address these vulnerabilities. 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. Fixed Releases At the time of publication, the release information in the following table (s) was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerabilities described in this advisory and which release included the fix for these vulnerabilities. Cisco FTD Software Cisco FTD Software Release First Fixed Release for these Vulnerabilities Earlier than 6.2.2 ^1 Migrate to a fixed release. 6.2.2 Migrate to a fixed release. 6.2.3 Migrate to a fixed release. 6.3.0 Migrate to a fixed release. 6.4.0 6.4.0.12 6.5.0 Migrate to a fixed release. 6.6.0 6.6.4 ^2 6.7.0 6.7.0.2 1. Cisco FMC and FTD Software releases 6.0.1 and earlier, as well as releases 6.2.0 and 6.2.1, have reached end of software maintenance . Customers are advised to migrate to a supported release that includes the fix for this vulnerability. 2. The First Fixed Release for the 6.6.0 code train was 6.6.3; however, due to upgrade issues associated with CSCvx86231 the recommended release is 6.6.4. To upgrade to a fixed release of Cisco FTD Software, do one of the following: For devices that are managed by using Cisco Firepower Management Center (FMC), use the FMC interface to install the upgrade. After installation is complete, reapply the access control policy. For devices that are managed by using Cisco Firepower Device Manager (FDM), use the FDM interface to install the upgrade. After installation is complete, reapply the access control policy. Cisco IOS XE Software and Cisco IOS XE SD-WAN Software Cisco UTD Snort IPS Engine Software for IOS XE and Cisco UTD Engine for IOS XE First Fixed Release for these SD-WAN Software ^1 Vulnerabilities Earlier than 16.12 Migrate to a fixed release. 16.12 16.12.5 17.1 Migrate to a fixed release. 17.2 Migrate to a fixed release. 17.3 17.3.3 17.4 17.4.1 ^ 1 Starting with release 17.2.1, Cisco IOS XE Software and Cisco IOS XE SD-WAN Software share the same image file. Open Source Snort The open source Snort project releases 2.9.17.1 and later contain the fix for these vulnerabilities. For more information on open source Snort, see the Snort website . 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 vulnerabilities that are described in this advisory. Source o These vulnerabilities were found by Santosh Krishnamurthy 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-http-fp-bp-KfDdcQhc Revision History o +---------+------------------------------+---------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+------------------------------+---------+--------+-------------+ | 1.1 | Added CVE-2021-1494 to the | - | Final | 2021-MAY-20 | | | advisory | | | | +---------+------------------------------+---------+--------+-------------+ | 1.0 | Initial public release. | - | Final | 2021-APR-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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYOKUoONLKJtyKPYoAQjpAA//R/0+R1kD9YvgbPMkx8zJuXX4MR+0xTV3 8px4rs4qxL3Bs5oY1ig1AcV4UAlNXzZNByxw3VZ7L3BBOCUjTJj+Y2vPuNfwVMPD QJ00WXnqvf2W30k9dEPBbufeZcnasXl08RN+GI9ZGUlB+zyAfo2kw+arceDfxxsO jMlyUOECE7Qw5bPN5JPeRpg0hFesmy1dqgw+J04kHlprtmp2JD94ccMt115mEnIC aKE3uFaH7FPEQR7CD580xUdbtAOPrusTRoWpnPQXokvzT8FspvHmbuZHA40uevWI uto0MFr1wXLJS74cYnejswb7/iM5iyAMw9fYn/FvrpZzw/Cha01vxvk9yRRo+MQf vPoOqatyNfI+Vm56qjKM1YFkdSlUYw06wbQVIUEUSoDImEz1RpCI4aDYiA/weIhK vC6MjpEIJtig/lhp7VyXRyBh2atH+Vb2BMWZr7kj9yBq6InkwLCEyY5eoW1EAjGr JIiIuDILKZE702PnRRICCrcjuRaIuYTuGYJhasFsto2AxlDsIHNHUrgIiW7+8gjQ mGTL3UBtrYl3lV2IqFpwUMlUG8lh593UXdNZXdGsMdOzJiPasBgTOoC/D5jO2P+5 dBLgIXURlYJ1rDTroSZu9OdoZLDz6OkzgJ6bh/gxXRPtFou7cNHWW/6rm2ZL7Da/ dUh0i4P+vmI= =PFn3 -----END PGP SIGNATURE-----