Double Free Vulnerability in cifs Package
Summary
GSD-2022-1003163: cifs: fix potential double free during failed mount. Affects Kernel versions < 9a167fc440e5693c1cdd7f07071e05658bd9d89d. No fix is published. How to fix ↓
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Background
The cifs package is a part of the Linux Kernel ecosystem and is responsible for providing support for the Common Internet File System (CIFS) protocol. CIFS allows Linux systems to access files and resources on remote Windows servers. It is widely used for network file sharing and provides features like authentication, file and directory access, and file locking. However, a vulnerability has been discovered in the cifs package that could lead to a potential double free during a failed mount operation.
Vulnerability Detail
The vulnerability in the cifs package arises during a failed mount operation. When attempting to mount a remote file system using CIFS, if the mount operation fails, there is a possibility of a double free occurring. A double free vulnerability occurs when a program attempts to free a memory block that has already been freed, potentially leading to memory corruption and exploitation by an attacker. In this case, an attacker could potentially trigger the double free vulnerability during a failed mount operation and execute arbitrary code or cause a denial of service.
How To Fix
No fixed version is published for this vulnerability.
The vulnerability has been fixed in the Linux Kernel version v5.17.14 by commit 9a167fc440e5693c1cdd7f07071e05658bd9d89d. To fix the vulnerability, users are advised to update their Linux Kernel to version v5.17.14 or later. This can be done by downloading the updated kernel source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compiling it for their specific system. Alternatively, users can also wait for their Linux distribution to release an updated package containing the fixed version of the kernel.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel to the patched version.
Conclusion
The cifs package in the Linux Kernel is vulnerable to a double free vulnerability during a failed mount operation. This vulnerability has been fixed in the Linux Kernel version v5.17.14. Users are advised to update their Linux Kernel to the patched version to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The cifs package is a component of the Linux Kernel that provides support for the Common Internet File System (CIFS) protocol, allowing Linux systems to access files and resources on remote Windows servers.
A double free vulnerability occurs when a program attempts to free a memory block that has already been freed, potentially leading to memory corruption and exploitation by an attacker.
The vulnerability can be fixed by updating the Linux Kernel to version v5.17.14 or later. Users can download the updated kernel source code from the official Linux Kernel repository and compile it for their system.
There are no specific workarounds mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel.
If exploited, this vulnerability could allow an attacker to execute arbitrary code or cause a denial of service on a system running the vulnerable version of the cifs package.
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