Race Condition Vulnerability in ubifs Package
Summary
GSD-2021-1001294: ubifs: Fix races between xattr_{set|get} and listxattr operations. Affects Kernel versions >= 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d, < 38dde03eb239605f428f3f1e4baa73d4933a4cc6. No fix is published. How to fix ↓
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Background
The ubifs package is a component of the Linux Kernel, which is responsible for the Unsorted Block Image File System. It provides a file system implementation for flash memory devices. The package allows for the storage of extended attributes (xattrs) on files and directories. However, a race condition vulnerability has been identified in the xattr_{set|get} and listxattr operations of ubifs, which can lead to potential security issues.
Vulnerability Detail
The race condition vulnerability in ubifs occurs when multiple threads or processes attempt to perform xattr_{set|get} and listxattr operations simultaneously. This can result in inconsistent or incorrect handling of extended attributes, potentially leading to data corruption or unauthorized access to sensitive information. The vulnerability was introduced in version v2.6.27 of the Linux Kernel and has been fixed in version v5.10.51.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, it is advisable to avoid concurrent xattr_{set|get} and listxattr operations in ubifs. This can be achieved by implementing proper synchronization mechanisms, such as locks or semaphores, to ensure that only one operation is performed at a time. Here is an example of how to use a lock to prevent concurrent operations:
#include <linux/mutex.h>
static DEFINE_MUTEX(xattr_mutex);
void set_xattr(const char *path, const char *name, const void *value, size_t size)
{
mutex_lock(&xattr_mutex);
// Perform xattr set operation
mutex_unlock(&xattr_mutex);
}
void get_xattr(const char *path, const char *name, void *value, size_t size)
{
mutex_lock(&xattr_mutex);
// Perform xattr get operation
mutex_unlock(&xattr_mutex);
}
void list_xattr(const char *path, char *list, size_t size)
{
mutex_lock(&xattr_mutex);
// Perform listxattr operation
mutex_unlock(&xattr_mutex);
}
Conclusion
In conclusion, the race condition vulnerability in ubifs can lead to data corruption or unauthorized access to sensitive information. It is crucial to update the Linux Kernel to version v5.10.51 or later to mitigate this vulnerability. Implementing proper synchronization mechanisms can also serve as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
ubifs is a file system implementation for flash memory devices in the Linux Kernel. It provides a way to store and manage data on flash storage efficiently.
The race condition vulnerability in ubifs can lead to data corruption or unauthorized access to sensitive information. It is important to apply the fix to ensure the integrity and security of the system.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and it will analyze the dependencies for any known vulnerabilities.
Yes, a workaround is available for this vulnerability. It involves implementing proper synchronization mechanisms, such as locks or semaphores, to prevent concurrent xattr_{set|get} and listxattr operations.
You can find detailed instructions on how to update the Linux Kernel in the official documentation provided by the Linux Kernel community.
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