Critical Shift Value Validation Vulnerability in Linux Kernel (CVE-2022-49553)
Summary
CVE-2022-49553: In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate BOOT sectors_per_clusters When the NTFS BOOT sectors_per_clusters field is > 0x80, it represents a shift value. Affects linux versions < 5.18.2-1. Fixed in 5.18.2-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It supports a wide range of functionalities, including file systems, process management, and device control. The NTFS file system, commonly used in Windows environments, is also supported by the Linux kernel through the ntfs3 module. This vulnerability specifically affects the validation of the BOOT sectors_per_clusters field in NTFS, which can lead to serious errors if not properly handled.
Vulnerability Detail
The vulnerability identified as CVE-2022-49553 arises from improper validation of the sectors_per_clusters field in NTFS BOOT sectors. When this field exceeds 0x80, it indicates a shift value that can potentially be negative or larger than the maximum allowed size (2MB). This can lead to undefined behavior, including a UBSAN error indicating a shift-out-of-bounds condition. If exploited, this vulnerability could cause system instability or crashes, impacting the reliability of systems utilizing the Linux kernel.
How To Fix
Minimum fixed version
5.18.2-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch as soon as it is available.
Conclusion
CVE-2022-49553 is a critical vulnerability in the Linux kernel that affects the NTFS file system's handling of the BOOT sectors_per_clusters field. It is essential to update to the fixed version to ensure system stability and security. Users are encouraged to utilize tools like Vulert to monitor their systems for vulnerabilities.
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FAQ
CVE-2022-49553 is a vulnerability in the Linux kernel related to improper validation of the NTFS BOOT sectors_per_clusters field, which can lead to system instability.
You can use Vulert, which monitors open-source vulnerabilities in your software. By utilizing the Vulert playground, you can check if your application is affected by this vulnerability without needing to sign up.
If exploited, this vulnerability can cause system crashes or undefined behavior, leading to potential data loss or corruption.
Yes, the patched version of the Linux package is 5.18.2-1 for both Debian 12 and 13.
While there are no specific workarounds, it is crucial to monitor your system for any unusual behavior and plan to apply the update as soon as possible.
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