Critical Buffer Overflow Vulnerability in mcrypt Package
Summary
DEBIAN-CVE-2012-4409: Stack-based buffer overflow in the check_file_head function in extra.c in mcrypt 2.6.8 and earlier allows user-assisted remote attackers to execute arbitrary code via an encrypted file with a crafted header containing lo... Affects mcrypt versions < 2.6.8-1.1. Fixed in 2.6.8-1.1. How to fix ↓
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Background
mcrypt is a widely used encryption library that provides a simple interface for various encryption algorithms. It is commonly utilized in applications requiring secure data storage and transmission. However, versions 2.6.8 and earlier are vulnerable to a stack-based buffer overflow, which can be exploited by attackers to execute arbitrary code.
Vulnerability Detail
The vulnerability arises from a stack-based buffer overflow in the check_file_head function located in extra.c of mcrypt version 2.6.8 and earlier. This flaw allows user-assisted remote attackers to execute arbitrary code by providing an encrypted file with a specially crafted header containing excessively long salt data. If exploited, this could lead to unauthorized access, data corruption, or complete system compromise.
How To Fix
Minimum fixed version
2.6.8-1.1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade mcryptTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users are advised to avoid using mcrypt for handling untrusted encrypted files until the package is updated to a secure version. Additionally, validating the integrity of encrypted files before processing can help mitigate the risk.
Conclusion
The mcrypt package has a critical vulnerability that can lead to severe security risks if not addressed. Users are strongly encouraged to update to the latest patched version to protect their systems from potential exploitation. Utilizing tools like Vulert can further enhance security by providing real-time alerts for open-source vulnerabilities.
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FAQ
The vulnerability is a stack-based buffer overflow that can be exploited through specially crafted encrypted files.
Versions 2.6.8 and earlier of mcrypt are affected by this vulnerability.
Exploitation could lead to arbitrary code execution, allowing attackers to gain unauthorized access or control over the system.
You can use Vulert, which monitors open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
Yes, avoid processing untrusted encrypted files and validate the integrity of files before handling them.
References
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