Vulnerabilities > CVE-2024-26643 - Improper Locking vulnerability in multiple products
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout While the rhashtable set gc runs asynchronously, a race allows it to collect elements from anonymous sets with timeouts while it is being released from the commit path. Mingi Cho originally reported this issue in a different path in 6.1.x with a pipapo set with low timeouts which is not possible upstream since 7395dfacfff6 ("netfilter: nf_tables: use timestamp to check for set element timeout"). Fix this by setting on the dead flag for anonymous sets to skip async gc in this case. According to 08e4c8c5919f ("netfilter: nf_tables: mark newset as dead on transaction abort"), Florian plans to accelerate abort path by releasing objects via workqueue, therefore, this sets on the dead flag for abort path too.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
- Leveraging Race Conditions via Symbolic Links This attack leverages the use of symbolic links (Symlinks) in order to write to sensitive files. An attacker can create a Symlink link to a target file not otherwise accessible to her. When the privileged program tries to create a temporary file with the same name as the Symlink link, it will actually write to the target file pointed to by the attackers' Symlink link. If the attacker can insert malicious content in the temporary file she will be writing to the sensitive file by using the Symlink. The race occurs because the system checks if the temporary file exists, then creates the file. The attacker would typically create the Symlink during the interval between the check and the creation of the temporary file.
References
- https://git.kernel.org/stable/c/291cca35818bd52a407bc37ab45a15816039e363
- https://git.kernel.org/stable/c/291cca35818bd52a407bc37ab45a15816039e363
- https://git.kernel.org/stable/c/406b0241d0eb598a0b330ab20ae325537d8d8163
- https://git.kernel.org/stable/c/406b0241d0eb598a0b330ab20ae325537d8d8163
- https://git.kernel.org/stable/c/5224afbc30c3ca9ba23e752f0f138729b2c48dd8
- https://git.kernel.org/stable/c/5224afbc30c3ca9ba23e752f0f138729b2c48dd8
- https://git.kernel.org/stable/c/552705a3650bbf46a22b1adedc1b04181490fc36
- https://git.kernel.org/stable/c/552705a3650bbf46a22b1adedc1b04181490fc36
- https://git.kernel.org/stable/c/b2d6f9a5b1cf968f1eaa71085ceeb09c2cb276b1
- https://git.kernel.org/stable/c/b2d6f9a5b1cf968f1eaa71085ceeb09c2cb276b1
- https://git.kernel.org/stable/c/d75a589bb92af1abf3b779cfcd1977ca11b27033
- https://git.kernel.org/stable/c/d75a589bb92af1abf3b779cfcd1977ca11b27033
- https://git.kernel.org/stable/c/e2d45f467096e931044f0ab7634499879d851a5c
- https://git.kernel.org/stable/c/e2d45f467096e931044f0ab7634499879d851a5c
- https://git.kernel.org/stable/c/edcf1a3f182ecf8b6b805f0ce90570ea98c5f6bf
- https://git.kernel.org/stable/c/edcf1a3f182ecf8b6b805f0ce90570ea98c5f6bf
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html