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AUSCERT External Security Bulletin Redistribution
ESB-2020.1620.2
Multiple Cisco Products Snort HTTP Detection Engine File
Policy Bypass Vulnerability
11 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Snort HTTP Detection Engine
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3315
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort_filepolbypass-m4X5DgOP
Revision History: May 11 2020: Vendor added fixed release information (1.1)
May 7 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-snort_filepolbypass-m4X5DgOP
First Published: 2020 May 6 16:00 GMT
Last Updated: 2020 May 8 15:54 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvr01675CSCvr82603CSCvt10151CSCvt28138
CVE-2020-3315
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 the configured file policies on an affected system.
The vulnerability is due to errors in how the Snort detection engine
handles specific HTTP responses. An attacker could exploit this
vulnerability by sending crafted HTTP packets that would flow through an
affected system. A successful exploit could allow the attacker to bypass
the configured file policies and deliver a malicious payload to the
protected network.
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-snort_filepolbypass-m4X5DgOP
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) ^ 1
3000 Series Industrial Security Appliances (ISAs)
4000 Series Integrated Services Routers (ISRs)
Cloud Services Router 1000V Series
Firepower Threat Defense (FTD) Software
Integrated Services Virtual Router (ISRv) ^ 1
1. This vulnerability affected these products only if they were running a
Cisco IOS XE SD-WAN Software image.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
This vulnerability also affected all open source Snort project releases
earlier than Release 2.9.16. For more information, see the Snort website .
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 MX Security Appliances
Workarounds
o There are no workarounds that address this vulnerability.
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 and Alerts 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
Cisco FTD Software
At the time of publication, Cisco FTD Software releases 6.6.0 and later
contained the fix for this vulnerability. ^ 1
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
1. Cisco FMC and FTD Software releases 6.0.1 and earlier 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, customers can 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 Cisco IOS XE Software
At the time of publication, Cisco Unified Threat Defense (UTD) Snort
Intrusion Protection System (IPS) Engine Software for Cisco IOS XE Software
releases 17.2.1r and later contained the fix for the CSCvt10151 portion of
this vulnerability.
At the time of publication, Cisco had not released updates that address the
CSCvt28138 portion of this vulnerability for Cisco Unified Threat Defense
(UTD) Snort Intrusion Protection System (IPS) Engine Software for Cisco IOS
XE Software.
See the Details section in the bug IDs CSCvt10151 and CSCvt28138 for the
most complete and current information.
Cisco UTD Snort IPS Engine Software for Cisco IOS XE SD-WAN Software
At the time of publication, Cisco had not released updates that address
this vulnerability for Cisco UTD Snort IPS Engine Software for Cisco IOS XE
SD-WAN Software.
See the Details section in the bug IDs CSCvt10151 and CSCvt28138 for the
most complete and current information.
Open Source Snort
At the time of publication, open source Snort project releases 2.9.16 and
later contained the fix for this vulnerability. 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-snort_filepolbypass-m4X5DgOP
Revision History
o +---------+------------------------------+---------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+------------------------------+---------+--------+-------------+
| | Added fixed release | | | |
| 1.1 | information for Cisco UTD | Fixed | Final | 2020-MAY-08 |
| | Snort IPS Engine for Cisco | Release | | |
| | IOS XE Software. | | | |
+---------+------------------------------+---------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2020-MAY-06 |
+---------+------------------------------+---------+--------+-------------+
- --------------------------END INCLUDED TEXT--------------------
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