Bypassing Content Filters in Cisco Email Security Appliance through GZIP Decompression Vulnerability

Bypassing Content Filters in Cisco Email Security Appliance through GZIP Decompression Vulnerability

CVE-2019-1905 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

A vulnerability in the GZIP decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass configured content filters on the device. The vulnerability is due to improper validation of GZIP-formatted files. An attacker could exploit this vulnerability by sending a malicious file inside a crafted GZIP-compressed file. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email.

Learn more about our Cis Benchmark Audit For Cisco.