Critical Format String Vulnerability in libxml2: CVE-2016-4448
Summary
CVE-2016-4448: Format string vulnerability in libxml2 before 2.9.4 allows attackers to have unspecified impact via format string specifiers in unknown vectors. Affects libxml2 versions < 2.9.4+dfsg1-1. Fixed in 2.9.4+dfsg1-1. 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 flexibility, making it a popular choice in various applications and systems. However, prior to version 2.9.4, libxml2 was susceptible to a format string vulnerability, which could allow attackers to exploit the library through crafted input.
Vulnerability Detail
The format string vulnerability in libxml2 before version 2.9.4 allows attackers to exploit the library by injecting format string specifiers into the input. This can lead to various impacts, including information disclosure, denial of service, or even remote code execution, depending on the context in which the library is used. The vulnerability arises from improper handling of user-supplied data, which can be manipulated to control the output format, potentially leading to severe consequences for affected systems.
How To Fix
Minimum fixed version
2.9.4+dfsg1-1
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
If upgrading is not immediately possible, consider restricting access to the affected application or service until the upgrade can be performed. Additionally, review and sanitize any input that may be processed by libxml2 to reduce the risk of exploitation.
Conclusion
CVE-2016-4448 represents a significant security risk for applications utilizing libxml2 versions prior to 2.9.4. It is crucial for users to upgrade to the fixed version to protect against potential exploits. Regular monitoring and vulnerability management practices, such as using tools like Vulert, can help maintain the security of your software.
See every vulnerability recorded for libxml2 →
FAQ
CVE-2016-4448 is a critical format string vulnerability found in libxml2 versions prior to 2.9.4, which can be exploited by attackers to manipulate the library's output.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
The vulnerability can lead to information disclosure, denial of service, or remote code execution, depending on how the library is utilized in your application.
Yes, you can restrict access to the affected application and sanitize inputs to reduce the risk of exploitation until an upgrade can be performed.
The CVSS score for CVE-2016-4448 is 9.8, indicating a critical level of severity.
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