Cisco Secure Email Gateway Malware Detection Evasion

Cisco Secure Email Gateways, formerly known as Cisco Ironport Email Security Appliances, that are configured to detect malicious email attachments, can easily be circumvented. A remote attacker can leverage error tolerance and different MIME decoding capabilities of email clients, compared with the gateway, to evade detection of malicious payloads by anti-virus components on the gateway. This exploit was successfully tested with a zip file containing the Eicar test virus and Cisco Secure Email Gateways with AsyncOS 14.2.0-620, 14.0.0-698, and others. An affected Email Client was Mozilla Thunderbird 91.11.0 (64-bit).Exploit Files ≈ Packet Storm  


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