Critical Use-After-Free Vulnerability in libxml2 Package
Summary
DEBIAN-CVE-2022-49043: xmlXIncludeAddNode in xinclude.c in libxml2 before 2.11.0 has a use-after-free. Affects libxml2 versions < 2.9.10+dfsg-6.7+deb11u6. Fixed in 2.9.10+dfsg-6.7+deb11u6. How to fix ↓
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Background
libxml2 is a widely used XML parsing library that provides a range of functionalities for processing XML documents. It is known for its performance and compliance with standards, making it a crucial component in many applications. However, it has been identified to have a critical vulnerability that can lead to severe security risks if not addressed promptly.
Vulnerability Detail
The vulnerability identified as DEBIAN-CVE-2022-49043 affects libxml2 versions prior to 2.11.0. It is a use-after-free vulnerability located in the xmlXIncludeAddNode function within the xinclude.c file. This flaw can be exploited by attackers to execute arbitrary code or cause a denial of service, potentially compromising the integrity and availability of applications relying on this library.
How To Fix
Minimum fixed version
2.9.10+dfsg-6.7+deb11u6
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libxml2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, if updating the package is not immediately feasible, consider isolating the application that uses libxml2 from untrusted input to mitigate the risk of exploitation until a proper update can be applied.
Conclusion
The identified use-after-free vulnerability in the libxml2 package poses significant risks to applications that utilize this library. It is crucial to update to the latest patched versions to mitigate these risks and ensure the security of your software.
See every vulnerability recorded for libxml2 →
FAQ
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed, potentially allowing attackers to manipulate the memory and execute arbitrary code.
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Exploitation of this vulnerability can lead to arbitrary code execution, data corruption, or denial of service, which can severely impact the security and stability of applications.
Yes, you should upgrade to the patched versions: 2.9.10+dfsg-6.7+deb11u6 for Debian 11, 2.9.14+dfsg-1.3~deb12u2 for Debian 12, and 2.12.7+dfsg+really2.9.14-0.4 for Debian 13 and 14.
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References
Related vulnerabilities
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