Global Buffer Over-read Vulnerability in libxml2: CVE-2020-24977
Summary
UBUNTU-CVE-2020-24977: GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at libxml2/entities.c. Affects libxml2 versions < 2.9.1+dfsg1-3ubuntu4.13+esm2. Fixed in 2.9.1+dfsg1-3ubuntu4.13+esm2. How to fix ↓
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Background
libxml2 is a widely used XML parsing library that provides a variety of functionalities for processing XML documents. It is essential for applications that require XML manipulation, including web browsers, document editors, and data interchange systems. The library is known for its performance and compliance with XML standards. However, it has been found to be vulnerable to a global buffer over-read, which can lead to potential data exposure.
Vulnerability Detail
The vulnerability identified as CVE-2020-24977 is a global buffer over-read in the xmlEncodeEntitiesInternal function located in libxml2/entities.c. This flaw allows an attacker to read beyond the allocated memory buffer, potentially exposing sensitive information. The issue arises from improper handling of input data, which can lead to unintended memory access. If exploited, this vulnerability could allow an attacker to gain access to confidential data, impacting the integrity and confidentiality of the affected systems.
How To Fix
Minimum fixed version
2.9.1+dfsg1-3ubuntu4.13+esm2
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, users can limit the input data size to the xmlEncodeEntitiesInternal function to prevent the over-read condition. However, this is not a permanent solution and updating the package is strongly recommended.
Conclusion
CVE-2020-24977 is a significant vulnerability in the libxml2 library that can lead to global buffer over-reads, potentially exposing sensitive information. It is crucial for users to update their libxml2 installations to the latest patched versions to mitigate this risk. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
CVE-2020-24977 is a vulnerability in the libxml2 library that allows for a global buffer over-read, potentially exposing sensitive information.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
Exploitation of this vulnerability can lead to unauthorized access to sensitive data, compromising the security and privacy of affected systems.
Yes, a patched version of libxml2 is available. Users should update to at least version 2.9.10+dfsg-5ubuntu0.20.04.1 to mitigate the risk.
The CVSS score for CVE-2020-24977 is 6.5, indicating a medium severity level.
References
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