cisco-sa-20191120-esa-mp3-bypass: Cisco Email Security Appliance MP3 Content Filter Bypass Vulnerability
First published: Wed Nov 20 2019(Updated: )
A vulnerability in the MP3 detection 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 certain MP3 file types. An attacker could exploit this vulnerability by sending a crafted MP3 file through the targeted device. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-esa-mp3-bypass
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Email Security Appliance Firmware |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20191120-esa-mp3-bypass?
The severity of cisco-sa-20191120-esa-mp3-bypass is classified as medium due to the potential for unauthorized access to content filtering mechanisms.
How do I fix cisco-sa-20191120-esa-mp3-bypass?
To fix cisco-sa-20191120-esa-mp3-bypass, ensure you apply the latest patches and updates provided by Cisco for the Email Security Appliance firmware.
Who is affected by cisco-sa-20191120-esa-mp3-bypass?
Any organization using Cisco Email Security Appliance running a vulnerable version of AsyncOS is affected by cisco-sa-20191120-esa-mp3-bypass.
What can an attacker do with cisco-sa-20191120-esa-mp3-bypass?
An attacker can bypass configured content filters, potentially allowing the delivery of malicious content to users.
Is authentication required to exploit cisco-sa-20191120-esa-mp3-bypass?
No, authentication is not required to exploit cisco-sa-20191120-esa-mp3-bypass, making it a greater risk.
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