Critical Integer Overflow Vulnerability in libxml2: Segmentation Fault Risk
Summary
DEBIAN-CVE-2022-40303: An issue was discovered in libxml2 before 2.10.3. Affects libxml2 versions < 2.9.10+dfsg-6.7+deb11u3. Fixed in 2.9.10+dfsg-6.7+deb11u3. 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 XML standards. However, prior to version 2.10.3, libxml2 is susceptible to a critical vulnerability that arises when parsing large XML documents with the XML_PARSE_HUGE option enabled, potentially leading to severe application crashes.
Vulnerability Detail
An issue was discovered in libxml2 before version 2.10.3. When parsing a multi-gigabyte XML document with the XML_PARSE_HUGE parser option enabled, several integer counters can overflow. This results in an attempt to access an array at a negative 2GB offset, typically leading to a segmentation fault. This vulnerability can be exploited by attackers to crash applications that rely on libxml2, leading to denial of service.
How To Fix
Minimum fixed version
2.9.10+dfsg-6.7+deb11u3
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 workaround, avoid using the XML_PARSE_HUGE option when parsing XML documents, especially if they are large. This can help mitigate the risk of triggering the vulnerability until a proper update can be applied.
Conclusion
The vulnerability in libxml2 poses a significant risk for applications that process large XML documents. It is crucial to update to the latest patched versions to mitigate the risk of segmentation faults and potential denial of service. Users should also consider using tools like Vulert for ongoing vulnerability monitoring.
See every vulnerability recorded for libxml2 →
FAQ
libxml2 is an open-source library for parsing XML documents, providing functionalities for reading, writing, and manipulating XML data.
The XML_PARSE_HUGE option allows libxml2 to parse very large XML documents, but it can also expose the library to vulnerabilities if not handled correctly.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploiting this vulnerability can lead to application crashes, resulting in denial of service and potential data loss.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
References
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