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AUSCERT External Security Bulletin Redistribution
ESB-2020.2422.2
Cisco Content Security Management Appliance Filter Bypass Vulnerability
17 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Content Security Management Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3370
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ESA-filt-39jXvMfM
Revision History: July 17 2020: Replaced SMA with ESA
July 16 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Email Security Appliance Filter Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ESA-filt-39jXvMfM
First Published: 2020 July 15 16:00 GMT
Last Updated: 2020 July 16 16:44 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvs58807
CVE-2020-3370
CWE-20
CVSS Score:
4.0 AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in URL filtering for Cisco Email Security Appliance (ESA)
could allow an unauthenticated, remote attacker to bypass URL filtering on
an affected device.
The vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by sending a crafted, malicious HTTP
request to an affected device. A successful exploit could allow the
attacker to redirect users to malicious sites.
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-ESA-filt-39jXvMfM
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco ESA software
releases earlier than Release 13.0.1 and Release 13.5.1.
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.
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 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, Cisco ESA software releases 13.0.1 and later
and releases 13.5.1 and later contained the fix for this vulnerability.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 Dennis McCabe Jr. 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-ESA-filt-39jXvMfM
Revision History
o +---------+----------------------------+-----------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+----------------------------+-----------+--------+-------------+
| 1.1 | Replaced SMA with ESA | Multiple. | Final | 2020-JUL-16 |
| | throughout advisory. | | | |
+---------+----------------------------+-----------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2020-JUL-15 |
+---------+----------------------------+-----------+--------+-------------+
- --------------------------END INCLUDED TEXT--------------------
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