Exim4 - Arbitrary Code Execution
Summary
DLA-1001-1: exim4 - security update. Affects exim4 versions < 4.80-7+deb7u5. Fixed in 4.80-7+deb7u5. How to fix ↓
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Background
Exim4 is a mail transfer agent (MTA) used on Unix-like operating systems. It is responsible for receiving, routing, and delivering email messages. Exim4 is widely used due to its flexibility and extensive configuration options. However, a vulnerability has been discovered in Exim4 that allows attackers to execute arbitrary code on the affected system.
Vulnerability Detail
The vulnerability in Exim4 arises from the use of multiple "-p" command line arguments that are allocated memory but never freed. This, in combination with other issues, enables attackers to exploit the system and execute arbitrary code. By crafting malicious input, an attacker can trigger a buffer overflow or other memory corruption vulnerabilities, leading to remote code execution. This can have severe consequences, including unauthorized access, data theft, or complete compromise of the affected system.
How To Fix
Minimum fixed version
4.80-7+deb7u5
This is the first release that contains the fix.
sudo apt-get install --only-upgrade exim4Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is crucial to apply the security update as soon as possible to mitigate the risk of exploitation.
Conclusion
The vulnerability in Exim4 can allow attackers to execute arbitrary code on the affected system, potentially leading to unauthorized access or complete compromise. It is crucial to upgrade the Exim4 package to version 4.80-7+deb7u5 or later to mitigate this risk. For further support on vulnerability remediation, you can reach out to DevNack.com.
See every vulnerability recorded for exim4 →
FAQ
Exim4 is a mail transfer agent used for routing and delivering email messages on Unix-like systems.
The vulnerability allows attackers to execute arbitrary code on the affected system, potentially leading to unauthorized access, data theft, or complete compromise.
To fix this vulnerability, upgrade the Exim4 package to version 4.80-7+deb7u5 or later.
No, there is no known workaround for this vulnerability. Applying the security update is the recommended solution.
You can find more information about Debian LTS security advisories, including how to apply updates and frequently asked questions, at https://wiki.debian.org/LTS
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