A vulnerability in the uuencode inspection engine of Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass engine protection and deliver a malicious file as an email attachment. The vulnerability is due to improper implementation of the logic for decoding uuencoded content. An attacker could exploit this vulnerability sending a crafted uuencoded email message that contains a malicious attachment. Cisco has confirmed the vulnerability in a security notice and released software updates. Successful exploitation could allow the attacker to evade email filtering and deliver malicious content to a targeted user, which could be used to conduct further attacks. Administrators are advised to implement effective mitigations.
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.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2015-Feb-06 |
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