Denial of Service Vulnerability in libxml2
Summary
DSA-2978-2: libxml2 - security update. Affects libxml2 versions < 2.8.0+dfsg1-7+wheezy3. Fixed in 2.8.0+dfsg1-7+wheezy3. How to fix ↓
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Background
libxml2 is a widely used open-source library for parsing and manipulating XML files. It provides various functionalities for XML processing, including parsing, validation, and XPath querying. The library is commonly used in applications that deal with XML data, such as web browsers, document editors, and content management systems. However, a vulnerability has been discovered in libxml2 that can lead to a denial of service (DoS) attack.
Vulnerability Detail
The vulnerability in libxml2 is related to entity substitution. An attacker can exploit this vulnerability by crafting a malicious XML file that triggers excessive entity substitution, causing the application using libxml2 to consume excessive CPU resources and memory. This can lead to a DoS condition, where the affected application becomes unresponsive or crashes. The vulnerability can be particularly dangerous in scenarios where the application processes untrusted XML data, such as in web applications that accept user-generated XML content.
How To Fix
Minimum fixed version
2.8.0+dfsg1-7+wheezy3
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
There is no known workaround for this vulnerability. It is essential to apply the recommended fix by upgrading the libxml2 package to the fixed versions.
Conclusion
In conclusion, the libxml2 library is vulnerable to a denial of service (DoS) attack due to a flaw in entity substitution. To mitigate this vulnerability, it is crucial to upgrade the libxml2 package to the fixed versions mentioned. Failure to do so may result in the application becoming unresponsive or crashing when processing malicious XML files. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for libxml2 →
FAQ
libxml2 is an open-source library for parsing and manipulating XML files. It provides various functionalities for XML processing, including parsing, validation, and XPath querying.
The vulnerability can lead to a denial of service (DoS) attack, where an attacker can craft a malicious XML file that consumes excessive CPU resources and memory, causing the affected application to become unresponsive or crash.
Any application that uses the libxml2 library for XML processing is potentially affected by this vulnerability. This includes web browsers, document editors, content management systems, and other applications that deal with XML data.
No, there is no known workaround for this vulnerability. It is crucial to upgrade the libxml2 package to the fixed versions to mitigate the risk.
To fix this vulnerability, you need to upgrade the libxml2 package to version 2.8.0+dfsg1-7+wheezy1 or later for the stable distribution (wheezy), and version 2.9.1+dfsg1-4 or later for the unstable distribution (sid).
Related vulnerabilities
Recent vulnerabilities recorded for libxml2.
