Memory Corruption Vulnerability in OpenRC Package
Summary
ALPINE-CVE-2021-42341: checkpath in OpenRC before 0.44.7 uses the direct output of strlen() to allocate strings, which does not account for the '\0' byte at the end of the string. Affects openrc versions < 0.43.3-r2. Fixed in 0.43.3-r2. How to fix ↓
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Background
OpenRC is a dependency management tool used in Alpine Linux that facilitates service management and initialization. It is designed to be lightweight and efficient, providing a simple interface for managing system services. However, a vulnerability has been identified in OpenRC that can lead to memory corruption, impacting the stability and security of systems relying on this package.
Vulnerability Detail
The vulnerability, identified as CVE-2021-42341, arises from the checkpath function in OpenRC versions prior to 0.44.7. This function uses the direct output of strlen() to allocate strings without accounting for the null terminator ('\0') at the end of the string. As a result, this oversight can lead to memory corruption, potentially allowing an attacker to exploit the system. The vulnerability was introduced in git commit 63db2d99e730547339d1bdd28e8437999c380cae during the development of OpenRC version 0.44.0.
How To Fix
Minimum fixed version
0.43.3-r2
This is the first release that contains the fix.
sudo apk add --upgrade openrcTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can limit the use of the affected functions in OpenRC until the package is updated. However, the most effective solution is to apply the patch as soon as possible.
Conclusion
The identified vulnerability in OpenRC, CVE-2021-42341, poses a significant risk due to memory corruption issues. It is crucial for users to update their OpenRC packages to the latest patched versions to mitigate this risk. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2021-42341 is a vulnerability in the OpenRC package that can lead to memory corruption due to improper string allocation.
You can use Vulert, which monitors and alerts for open-source vulnerabilities. Visit Vulert Scanner to check if your application is affected without any signup.
The vulnerability can lead to memory corruption, which may result in system instability, crashes, or exploitation by attackers.
You can update the OpenRC package using the command 'apk add openrc@<patched_version>' in your terminal, replacing <patched_version> with the appropriate version number.
While the primary risk is system instability, there is a potential for data loss if the memory corruption leads to crashes or unexpected behavior.
References
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