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AUSCERT External Security Bulletin Redistribution
ESB-2019.3707
Cisco Email Security Appliance Filter Bypass Vulnerability
3 October 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Email Security Appliance
Publisher: Cisco Systems
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-12706
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-esa-bypass
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Cisco Email Security Appliance Filter Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20191002-esa-bypass
First Published: 2019 October 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvq35034
CVE-2019-12706
CWE-20
CVSS Score:
6.5 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the Sender Policy Framework (SPF) functionality of Cisco
AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an
unauthenticated, remote attacker to bypass the configured user filters on
an affected device.
The vulnerability exists because the affected software insufficiently
validates certain incoming SPF messages. An attacker could exploit this
vulnerability by sending a custom SPF packet to an affected device. A
successful exploit could allow the attacker to bypass the configured header
filters, which could allow malicious content to pass through the device.
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-20191002-esa-bypass
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco AsyncOS
Software for Cisco Email Security Appliance (ESA) releases earlier than
Release 13.5.
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 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
At the time of publication, Cisco AsyncOS Software for Cisco Email Security
Appliance (ESA) releases 13.5 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 Cisco would like to thank Fabian Henneke of the University of Bonn for
reporting this vulnerability.
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-20191002-esa-bypass
Revision History
o +---------+--------------------------+---------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2019-October-02 |
+---------+--------------------------+---------+--------+-----------------+
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