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AUSCERT External Security Bulletin Redistribution
ESB-2020.3640
Multiple Cisco Products SNORT HTTP Detection Engine File
Policy Bypass Vulnerability
22 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Products
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3299
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-bypass-3eCfd24j
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Multiple Cisco Products SNORT HTTP Detection Engine File Policy Bypass
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ftd-bypass-3eCfd24j
First Published: 2020 October 21 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvm69545CSCvq96573
CVE-2020-3299
CWE-693
CVSS Score:
5.8 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
o Multiple Cisco products are affected by a vulnerability in the Snort
detection engine that could allow an unauthenticated, remote attacker to
bypass a configured File Policy for HTTP.
The vulnerability is due to incorrect detection of modified HTTP packets
used in chunked responses. An attacker could exploit this vulnerability 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 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-ftd-bypass-3eCfd24j
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco software:
1000 Series Integrated Services Routers (ISRs)
3000 Series Industrial Security Appliances (ISAs)
4000 Series Integrated Services Routers (ISRs)
Cloud Services Router 1000V
Firepower Threat Defense (FTD) Software
Integrated Services Virtual Router (ISRv)
Meraki MX Series Security Appliances ^ 1
1. See Products Confirmed Not Vulnerable section in this advisory for
exceptions.
This vulnerability also affects the open-source Snort project version prior
to 2.9.13.1. For more information, see the Snort website .
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
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:
Adaptive Security Appliance (ASA) Software
Firepower Management Center (FMC) Software
Meraki MX64 Security Appliances
Meraki MX64W Security Appliances
Meraki vMX100 Virtual Appliances
Meraki Z1 Appliances
Meraki Z3 Series Appliances
Workarounds
o There are no workarounds that address this vulnerability. Please contact
TAC for mitigations.
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 vulnerability described in
this advisory and which release included the fix for this vulnerability.
Cisco FTD Software
Cisco FTD Software Release First Fixed Release for This Vulnerability
6.0 ^1 6.3.0.1
6.0.1 ^1 6.3.0.1
6.1.0 6.3.0.1
6.2.0 6.3.0.1
6.2.1 6.3.0.1
6.2.2 6.3.0.1
6.2.3 6.3.0.1
6.3.0 6.3.0.1
6.4.0 Not vulnerable.
6.5.0 Not vulnerable.
6.6.0 Not vulnerable.
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.
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 UTD Snort IPS Engine Software for IOS XE
UTD SNORT IPS Engine IOS XE First Fixed Release for This
Release Vulnerability
16.9 16.9.5
16.12 16.12.2
17.1 Not vulnerable.
17.2 Not vulnerable.
See the Details section in the bug IDs CSCvq96573 for the most complete and
current information.
Cisco UTD Engine Software for IOS XE SD-WAN
UTD Engine IOS XE SD-WAN Release First Fixed Release for This Vulnerability
16.10 16.10.3b
16.12 16.12.1d
17.2 Not vulnerable.
See the Details section in the bug IDs CSCvq96573 for the most complete and
current information.
Meraki MX Series Security Appliances
Meraki MX Series Security Appliance First Fixed Release for This
Release Vulnerability
MX 14 MX 14.53
MX 15 MX 15.33 (beta)
Open Source SNORT
This is fixed in the open-source Snort project version 2.9.13.1 and later.
For more information, 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 vulnerability that is
described in this advisory.
Source
o This vulnerability was 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-ftd-bypass-3eCfd24j
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-OCT-21 |
+----------+---------------------------+----------+--------+--------------+
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