Critical Out-of-Bounds Memory Access Vulnerability in libXv
Summary
ALPINE-CVE-2016-5407: The (1) XvQueryAdaptors and (2) XvQueryEncodings functions in X.org libXv before 1.0.11 allow remote X servers to trigger out-of-bounds memory access operations via vectors involving length specifications in received dat... Affects libxv versions < 1.0.10-r1. Fixed in 1.0.10-r1. How to fix ↓
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Background
libXv is a library that provides an interface for the X Video Extension, allowing applications to access video hardware capabilities. It is commonly used in graphical applications to enhance video playback. The library is integral for systems that rely on X11 for graphical output, making it a crucial component for many Linux distributions, including Alpine Linux. The vulnerability in question affects versions prior to 1.0.11, exposing systems to potential remote exploitation.
Vulnerability Detail
The vulnerability arises from the XvQueryAdaptors and XvQueryEncodings functions in libXv, which allow remote X servers to trigger out-of-bounds memory access operations. This can lead to severe consequences, including arbitrary code execution, data corruption, or system crashes. The flaw is rooted in improper handling of length specifications in received data, making it critical for users of affected versions to address it promptly.
How To Fix
Minimum fixed version
1.0.10-r1
This is the first release that contains the fix.
sudo apk add --upgrade libxvTip — 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 the affected functions until the package is updated. However, this is not a permanent solution and updating the package is strongly recommended.
Conclusion
The vulnerability in libXv poses a serious risk to systems utilizing this library, particularly those running affected versions. It is crucial for users to update to the patched versions as soon as possible to mitigate potential exploitation risks. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
See every vulnerability recorded for libxv →
FAQ
The CVSS score of this vulnerability is 9.8, indicating a critical level of severity.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to arbitrary code execution, data corruption, or system crashes, posing significant risks to system integrity.
Yes, you can restrict access to the X server or limit the use of the affected functions as a temporary measure until you can apply the update.
More information about libXv can be found in the official documentation or repositories related to the X Window System.
References
Related vulnerabilities
Recent vulnerabilities recorded for libxv.
