Out-of-Bounds Write Vulnerability in libXrender: CVE-2016-7950
Summary
DEBIAN-CVE-2016-7950: The XRenderQueryFilters function in X.org libXrender before 0.9.10 allows remote X servers to trigger out-of-bounds write operations via vectors involving filter name lengths. Affects libxrender versions < 1:0.9.10-1. Fixed in 1:0.9.10-1. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
libXrender is a library that provides an interface for rendering X11 graphics. It is commonly used in various applications that require graphical output in X Window System environments. The library facilitates advanced rendering techniques, enabling applications to produce high-quality graphics. However, certain versions of libXrender are vulnerable to a specific issue that allows remote X servers to exploit the library, leading to potential security risks.
Vulnerability Detail
The vulnerability, identified as CVE-2016-7950, arises from the XRenderQueryFilters function in X.org libXrender versions prior to 0.9.10. This flaw allows remote X servers to trigger out-of-bounds write operations by manipulating filter name lengths. Such exploitation can lead to unauthorized memory access, potentially allowing attackers to execute arbitrary code or crash the application, thereby compromising the integrity and availability of the system.
How To Fix
Minimum fixed version
1:0.9.10-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libxrenderTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can restrict access to the X server or limit the use of remote X connections until the package is updated. This can be done by configuring the X server settings to allow only trusted clients.
Conclusion
CVE-2016-7950 is a significant vulnerability affecting the libXrender library, allowing remote exploitation through out-of-bounds write operations. It is crucial for users to update to the patched version to safeguard their systems. Temporary workarounds can help mitigate risks until the update is applied.
See every vulnerability recorded for libxrender →
FAQ
CVE-2016-7950 is a vulnerability in the libXrender library that allows remote X servers to perform out-of-bounds write operations, potentially leading to security breaches.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The risks include unauthorized memory access, potential execution of arbitrary code, and application crashes, which can compromise system security.
Yes, the patched version of libXrender is 1:0.9.10-1. Updating to this version will resolve the vulnerability.
If immediate updating is not possible, consider restricting access to the X server or limiting remote X connections as a temporary measure.
References
Related vulnerabilities
Recent vulnerabilities recorded for libxrender.
