cisco-sa-esa-dos-87mBkc8n: Cisco Email Security Appliance Zip Decompression Engine Denial of Service Vulnerability
First published: Wed Jan 22 2020(Updated: )
A vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of zip files. An attacker could exploit this vulnerability by sending an email message with a crafted zip-compressed attachment. A successful exploit could trigger a restart of the content-scanning process, causing a temporary DoS condition. Cisco has released software updates that address the vulnerability described in this advisory. 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-esa-dos-87mBkc8n
| 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-esa-dos-87mBkc8n?
The severity of cisco-sa-esa-dos-87mBkc8n is classified as high due to its potential to cause a denial of service on affected devices.
How do I fix cisco-sa-esa-dos-87mBkc8n?
To fix cisco-sa-esa-dos-87mBkc8n, upgrade to the latest version of Cisco AsyncOS Software for the Email Security Appliance.
Which Cisco products are affected by cisco-sa-esa-dos-87mBkc8n?
Cisco Email Security Appliance (ESA) is the affected product for the vulnerability cisco-sa-esa-dos-87mBkc8n.
What type of attack does cisco-sa-esa-dos-87mBkc8n enable?
cisco-sa-esa-dos-87mBkc8n enables a denial of service (DoS) attack due to improper validation in the zip decompression engine.
Is authentication required to exploit cisco-sa-esa-dos-87mBkc8n?
No, exploitation of cisco-sa-esa-dos-87mBkc8n does not require authentication as it can be executed by an unauthenticated remote attacker.
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