Critical Buffer Overflow in libxml2: Remote Code Execution Risk
Summary
CVE-2017-7376: Buffer overflow in libxml2 allows remote attackers to execute arbitrary code by leveraging an incorrect limit for port values when handling redirects. Affects libxml2 across 2 version ranges.
< 2.9.4+dfsg1-3.1
< 2960178fe8f9fe690b7f8c1c49093ff54bb56934
Fixed in 2.9.4+dfsg1-3.1. 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 integral to many applications and systems, offering features such as validation, XPath support, and document manipulation. However, libxml2 has been found to have a critical vulnerability that can be exploited by remote attackers, potentially leading to severe security breaches.
Vulnerability Detail
The vulnerability, identified as CVE-2017-7376, is a buffer overflow issue in libxml2 that arises from an incorrect limit for port values when handling redirects. This flaw allows remote attackers to execute arbitrary code on affected systems. The vulnerability is particularly dangerous because it can be exploited without user interaction, making it a significant threat to systems using vulnerable versions of libxml2.
How To Fix
Minimum fixed version
2.9.4+dfsg1-3.1
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 an immediate upgrade is not feasible, consider implementing network-level protections such as firewalls to restrict access to vulnerable services. Additionally, monitor your systems for unusual activity that could indicate exploitation attempts.
Conclusion
CVE-2017-7376 represents a critical vulnerability in libxml2 that poses a significant risk of remote code execution. Users are strongly advised to upgrade to the latest version to protect their systems. Additionally, utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
See every vulnerability recorded for libxml2 →
FAQ
CVE-2017-7376 is a buffer overflow vulnerability in libxml2 that allows remote attackers to execute arbitrary code.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score for CVE-2017-7376 is 9.8, indicating a critical level of severity.
Exploitation of this vulnerability can lead to remote code execution, allowing attackers to gain control over affected systems.
Yes, implementing network-level protections and monitoring for unusual activity can help mitigate the risk until an upgrade is possible.
References
Related vulnerabilities
Recent vulnerabilities recorded for libxml2.
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