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AUSCERT External Security Bulletin Redistribution
ESB-2021.1467.2
Multiple Cisco Products Snort HTTP Detection Engine File
Policy Bypass Vulnerability
5 July 2021
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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——————–
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