Critical Integer Overflow Vulnerability in libXcursor: Heap Buffer Overflow Risk
Summary
ALPINE-CVE-2017-16612: libXcursor before 1.1.15 has various integer overflows that could lead to heap buffer overflows when processing malicious cursors, e.g., with programs like GIMP. Affects libxcursor versions < 1.1.15-r0. Fixed in 1.1.15-r0. How to fix ↓
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Background
libXcursor is a library that provides functions for loading and manipulating X cursor images. It is widely used in graphical applications, including popular software like GIMP. The library is essential for rendering cursor graphics in X Window System environments. However, prior to version 1.1.15, libXcursor is susceptible to integer overflow vulnerabilities, which can lead to severe security risks.
Vulnerability Detail
libXcursor before version 1.1.15 has various integer overflows that could lead to heap buffer overflows when processing malicious cursor files. This vulnerability can be exploited by attackers to execute arbitrary code or crash applications that utilize the library. The issue originates from improper handling of cursor data, particularly in the cursor/xcursor.c file, which may also affect related code in Wayland environments. The CVSS score for this vulnerability is 7.5, indicating a high severity level.
How To Fix
Minimum fixed version
1.1.15-r0
This is the first release that contains the fix.
sudo apk add --upgrade libxcursorTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If you cannot update the package immediately, consider restricting access to applications that utilize libXcursor or running them in a controlled environment to mitigate potential risks until the update can be applied.
Conclusion
The integer overflow vulnerability in libXcursor poses significant risks to applications that rely on this library. It is crucial to update to the patched version 1.1.15-r0 to mitigate these risks. Users should also consider using tools like Vulert to monitor for vulnerabilities in their applications.
See every vulnerability recorded for libxcursor →
FAQ
The vulnerability can lead to heap buffer overflows, allowing attackers to execute arbitrary code or crash applications using the library.
You can use Vulert, which monitors open-source vulnerabilities using a manifest file like package-lock.json. Visit Vulert Scanner to check your application without needing to sign up.
The CVSS score for this vulnerability is 7.5, indicating a high severity level.
Yes, the patch is available in version 1.1.15-r0 of the libXcursor package.
Consider restricting access to applications that utilize libXcursor or running them in a controlled environment until the update can be applied.
References
Related vulnerabilities
Recent vulnerabilities recorded for libxcursor.
