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Cisco Security Advisory 20150612-esa

Cisco Security Advisory 20150612-esa
Posted Nov 5, 2015
Authored by Cisco Systems | Site cisco.com

Cisco Security Advisory - A vulnerability in the anti-spam scanner of Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the anti-spam functionality of the ESA. The vulnerability is due to improper error handling of a malformed packet in the anti-spam scanner. An attacker could exploit this vulnerability by sending a crafted DNS Sender Policy Framework (SPF) text record. A successful exploit could allow the attacker to bypass the anti-spam scanner and generate a malformed packet alert. Cisco has released software updates that address this vulnerability. There are no workarounds that mitigate this vulnerability.

tags | advisory, remote
systems | cisco
SHA-256 | 04792a2b425ec2b1a11b8ca2deabf0a4ad7402e2c7458a4e4df4da38129ba17c

Cisco Security Advisory 20150612-esa

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Cisco Email Security Appliance Anti-Spam Scanner Bypass Vulnerability

Advisory ID: cisco-sa-20150612-esa

Revision 2.0

For Public Release 2015 November 4 16:00 UTC (GMT)

+---------------------------------------------------------------------

Summary
=======

A vulnerability in the anti-spam scanner of Cisco AsyncOS for Cisco
Email Security Appliance (ESA) could allow an unauthenticated, remote
attacker to bypass the anti-spam functionality of the ESA.

The vulnerability is due to improper error handling of a malformed
packet in the anti-spam scanner. An attacker could exploit this
vulnerability by sending a crafted DNS Sender Policy Framework (SPF)
text record. A successful exploit could allow the attacker to bypass
the anti-spam scanner and generate a malformed packet alert.

Cisco has released software updates that address this vulnerability.
There are no workarounds that mitigate this vulnerability.

This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150612-esa


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