Memory Initialization Flaw in xorg-server Leading to Potential ASLR Bypass
Summary
ALPINE-CVE-2020-14347: A flaw was found in the way xserver memory was not properly initialized. Affects xorg-server versions < 1.20.5-r1. Fixed in 1.20.5-r1. How to fix ↓
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Background
xorg-server is a crucial component of the X Window System, responsible for managing graphical displays on Unix-like operating systems. It facilitates communication between the operating system and the graphical hardware, enabling users to interact with their systems visually. The xorg-server package is widely used in various Linux distributions, including Alpine Linux. However, a vulnerability has been identified that compromises its security, particularly when running with elevated privileges.
Vulnerability Detail
A flaw was discovered in the xorg-server where memory was not properly initialized. This oversight could lead to the leakage of sensitive server memory to X clients. If the xorg-server operates with elevated privileges, this vulnerability poses a significant risk, potentially allowing an attacker to bypass Address Space Layout Randomization (ASLR), which is a security technique used to prevent exploitation of memory corruption vulnerabilities.
How To Fix
Minimum fixed version
1.20.5-r1
This is the first release that contains the fix.
sudo apk add --upgrade xorg-serverTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a workaround, users can consider running the xorg-server with reduced privileges or disabling features that require elevated access until the package can be updated. However, this may limit certain functionalities of the graphical environment.
Conclusion
The xorg-server vulnerability identified as ALPINE-CVE-2020-14347 poses a significant risk due to improper memory initialization, which could lead to ASLR bypass. Users are strongly advised to update to the patched versions of the package to mitigate this risk. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
The CVSS score of this vulnerability is 5.5, indicating a moderate level of risk.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If exploited, this vulnerability could allow an attacker to bypass ASLR, potentially leading to unauthorized access to sensitive information or system compromise.
Yes, versions 1.20.5-r1, 1.20.6-r1, and 1.20.8-r4 are patched and safe to use for Alpine Linux versions 3.10, 3.11, and 3.12 respectively.
If an immediate update is not possible, consider running the xorg-server with reduced privileges or disabling features that require elevated access as a temporary measure.
References
Related vulnerabilities
Recent vulnerabilities recorded for xorg-server.
