Integer Overflow and Double-Free Vulnerability in libX11: CVE-2020-14363
Summary
ALPINE-CVE-2020-14363: An integer overflow vulnerability leading to a double-free was found in libX11. Affects libx11 versions < 1.6.12-r0. Fixed in 1.6.12-r0. How to fix ↓
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Background
libX11 is a core library for the X Window System, providing essential functions for managing windows, graphics, and user input in UNIX-like operating systems. It serves as a fundamental component for applications that require graphical user interfaces. The library is widely used across various applications, making its security critical. This specific vulnerability exposes libX11 to potential exploitation, affecting the integrity and availability of systems that rely on it.
Vulnerability Detail
An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity, and system availability. The vulnerability arises from improper handling of integer values, which can be exploited to manipulate memory management, leading to severe consequences for affected applications.
How To Fix
Minimum fixed version
1.6.12-r0
This is the first release that contains the fix.
sudo apk add --upgrade libx11Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, consider restricting access to applications that utilize libX11 to trusted users only, thereby minimizing the risk of exploitation until the package can be updated.
Conclusion
The integer overflow and double-free vulnerability in libX11 (CVE-2020-14363) poses significant risks to applications relying on this library. It is crucial to update to the patched version to mitigate these risks. Users should also consider implementing temporary workarounds to limit exposure until the update is applied.
See every vulnerability recorded for libx11 →
FAQ
CVE-2020-14363 is a vulnerability in the libX11 library that can lead to integer overflow and double-free errors, potentially allowing 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 consequences include application crashes and potential arbitrary code execution, which can compromise system integrity and availability.
Yes, a patch is available in libX11 version 1.6.12-r0 and later. Updating to this version will resolve the vulnerability.
The CVSS score for this vulnerability is 7.8, indicating a high severity level.
References
Related vulnerabilities
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