CVE-2019-19449: Vulnerability in linux-libc-dev package leads to slab-out-of-bounds read access
Summary
CVE-2019-19449: In the Linux kernel 5.0.21, mounting a crafted f2fs filesystem image can lead to slab-out-of-bounds read access in f2fs_build_segment_manager in fs/f2fs/segment.c, related to init_min_max_mtime in fs/f2fs/segment.c (beca... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The linux-libc-dev package is a development package that provides the necessary header files and libraries for compiling C programs that use the Linux kernel interfaces. It is an essential component for building and running applications on Linux systems. The vulnerability in this package, identified as CVE-2019-19449, allows an attacker to trigger a slab-out-of-bounds read access when mounting a crafted f2fs filesystem image. This vulnerability exists in the fs/f2fs/segment.c file, specifically in the f2fs_build_segment_manager function. The issue arises due to the lack of validation of the second argument to the get_seg_entry function, which can be exploited by an attacker to read sensitive information from kernel memory.
Vulnerability Detail
The vulnerability (CVE-2019-19449) in the linux-libc-dev package arises from a flaw in the f2fs filesystem implementation. By mounting a specially crafted f2fs filesystem image, an attacker can trigger a slab-out-of-bounds read access in the f2fs_build_segment_manager function. This vulnerability can be exploited to read sensitive information from kernel memory, potentially leading to further compromise of the system. The issue is caused by the absence of proper validation of the second argument to the get_seg_entry function in the fs/f2fs/segment.c file. As a result, an attacker can manipulate this argument to access out-of-bounds memory and retrieve sensitive data.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can avoid mounting untrusted or unknown f2fs filesystem images until the package is updated with the necessary security patches. By refraining from mounting such filesystems, the risk of exploitation can be minimized. Additionally, it is recommended to follow best practices for system security, such as restricting access to privileged operations and regularly monitoring for any suspicious activity.
Conclusion
The vulnerability in the linux-libc-dev package (CVE-2019-19449) exposes systems to a slab-out-of-bounds read access issue when mounting a crafted f2fs filesystem image. This can lead to unauthorized access to sensitive information stored in kernel memory. To mitigate this vulnerability, it is crucial to update the linux-libc-dev package to a fixed version as soon as possible. Regularly monitoring for updates and following best practices for system security are essential to ensure the integrity and safety of the system. For further assistance or support in vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability allows an attacker to read sensitive information from kernel memory, potentially leading to further compromise of the system. It can be exploited by mounting a specially crafted f2fs filesystem image.
At the time of this report, there is no known public exploit available for this vulnerability. However, it is important to apply the necessary security patches to mitigate the risk.
The vulnerability is present in linux-libc-dev package version 6.1.90-1. It is recommended to update to a fixed version to eliminate the vulnerability.
As a temporary mitigation, users can avoid mounting untrusted or unknown f2fs filesystem images until the package is updated. Regularly monitoring for updates and promptly applying them is crucial for maintaining system security.
For more information about this vulnerability, you can refer to the CVE-2019-19449 entry on the National Vulnerability Database (NVD) website.
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