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
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
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:
For information about which Cisco software releases were vulnerable at the time of release, see the Fixed Software section of this advisory.
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:
There are no workarounds that address these vulnerabilities.
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.
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 6.2.21 | 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 | 6.6.42 |
| 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:
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 SD-WAN Software1 | First Fixed Release for these 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 |
1Starting 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.
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.
These vulnerabilities were found by Santosh Krishnamurthy of Cisco during internal security testing.
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.
| Version | Description | Section | Status | Date |
|---|---|---|---|---|
| 1.1 | Added CVE-2021-1494 to the advisory | - | Final | 2021-MAY-20 |
| 1.0 | Initial public release. | - | Final | 2021-APR-28 |
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