Linux Kernel up to 6.7.4 nf_tables timestamp information disclosure

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.7.4. The affected element is an unknown function of the component nf_tables. Such manipulation of the argument timestamp leads to information disclosure. This vulnerability is referenced as CVE-2024-27397. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 6.7.4. Affected by this issue is some unknown functionality of the component nf_tables. The manipulation of the argument timestamp with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: use timestamp to check for set element timeout Add a timestamp field at the beginning of the transaction, store it in the nftables per-netns area. Update set backend .insert, .deactivate and sync gc path to use the timestamp, this avoids that an element expires while control plane transaction is still unfinished. .lookup and .update, which are used from packet path, still use the current time to check if the element has expired. And .get path and dump also since this runs lockless under rcu read size lock. Then, there is async gc which also needs to check the current time since it runs asynchronously from a workqueue.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2024-27397 since 02/25/2024. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 208224 (CBL Mariner 2.0 Security Update: hyperv-daemons (CVE-2024-27397)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.7.5 or 6.8 eliminates this vulnerability. Applying the patch 383182db8d58/7395dfacfff6 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (208224). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.7.0
• 6.7.1
• 6.7.2
• 6.7.3
• 6.7.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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