Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in the ZIP inspection engine of Cisco AsyncOS for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the engine protection and deliver malicious ZIP files.
The vulnerability is due to improper implementation of the logic for analyzing the content of a ZIP file. An attacker could exploit this vulnerability by crafting the ZIP file before sending it through the system.
Cisco has confirmed the vulnerability in a security notice and released software updates.
An exploit of this vulnerability could allow an attacker to bypass security restrictions on a targeted system, which could be used to send malicious ZIP files to be processed by the system. Processing the malicious ZIP files could be used to conduct further attacks.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Customers are advised to consult Cisco bug ID CSCup07934 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco AsyncOS Software for Cisco ESA versions 8.5 and prior were vulnerable. Later versions of Cisco AsyncOS for Cisco ESA may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
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 2014-Oct-14
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