Buffer Overflow in strlen in ocfs2
Summary
GSD-2021-1001919: ocfs2: mount fails with buffer overflow in strlen. Affects Kernel versions < ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb. No fix is published. How to fix ↓
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Background
ocfs2 is a file system implemented in the Linux kernel. It is designed to provide a shared file system for use with Oracle databases. The ocfs2 file system allows multiple nodes to concurrently access the same storage device. It provides features such as distributed metadata, caching, and high availability. However, a vulnerability has been discovered in ocfs2 that can lead to a buffer overflow in the strlen function.
Vulnerability Detail
The vulnerability in ocfs2 occurs due to a buffer overflow in the strlen function. When mounting an ocfs2 file system, the strlen function is used to determine the length of a string. However, if the string is longer than the buffer allocated for it, a buffer overflow can occur. This can potentially lead to arbitrary code execution or a denial of service attack. The vulnerability has been fixed in Linux Kernel version v4.4.290 by commit ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Linux Kernel is not immediately feasible, a possible workaround is to avoid mounting ocfs2 file systems until the vulnerability is fixed. This can be achieved by disabling the ocfs2 module or removing any ocfs2 file system entries from the /etc/fstab file. However, this workaround may impact the availability of ocfs2 file systems and should be considered temporary.
Conclusion
The buffer overflow vulnerability in strlen function in ocfs2 can be mitigated by updating the Linux Kernel to version v4.4.290 or later. If immediate update is not possible, avoiding the mounting of ocfs2 file systems can serve as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ocfs2 is a file system implemented in the Linux kernel, designed for use with Oracle databases. It allows multiple nodes to concurrently access the same storage device.
The vulnerability can lead to a buffer overflow, potentially enabling arbitrary code execution or causing a denial of service attack.
The vulnerability can be fixed by updating the Linux Kernel to version v4.4.290 or later.
A temporary workaround is to avoid mounting ocfs2 file systems until the vulnerability is fixed. This can be achieved by disabling the ocfs2 module or removing ocfs2 entries from the /etc/fstab file.
More information about the vulnerability can be found in the Open Source Vulnerability Database (OSVDB) entry: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001919.json
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