CVE-2019-1905: Cisco Email Security Appliance GZIP Content Filter Bypass Vulnerability
First published: Thu Jun 20 2019(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Email Security Appliance | =11.1.2 | |
| Cisco Email Security Appliance | =12.0.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1905?
CVE-2019-1905 is a vulnerability in the GZIP decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA).
How does CVE-2019-1905 affect Cisco Email Security Appliance?
CVE-2019-1905 allows an unauthenticated, remote attacker to bypass configured content filters on Cisco Email Security Appliance.
What is the severity of CVE-2019-1905?
CVE-2019-1905 has a severity rating of 5.8 (medium).
How can I fix CVE-2019-1905?
To fix CVE-2019-1905, users are advised to apply the necessary updates provided by Cisco.
Where can I find more information about CVE-2019-1905?
You can find more information about CVE-2019-1905 on the Cisco Security Advisory and SecurityFocus websites.
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