Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:H/RL:OF/RC:C
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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.
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Customers are advised to consult Cisco bug ID CSCzv54343 for a complete list of affected product versions.
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Administrators are advised to apply the appropriate updates.
Users are advised not to open unsolicited email attachments. Users should verify that attachments are safe before opening them.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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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.
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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.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2015-Feb-06
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