FreeBSD NFS Client readdir injection

Summaryinfo

A vulnerability described as problematic has been identified in FreeBSD. The affected element is the function readdir of the component NFS Client. Such manipulation leads to injection. This vulnerability is referenced as CVE-2024-6759. It is possible to launch the attack remotely. No exploit is available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in FreeBSD (unknown version). It has been rated as problematic. Affected by this issue is the function readdir of the component NFS Client. The manipulation with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality. CVE summarizes:

When mounting a remote filesystem using NFS, the kernel did not sanitize remotely provided filenames for the path separator character, "/". This allows readdir(3) and related functions to return filesystem entries with names containing additional path components. The lack of validation described above gives rise to a confused deputy problem. For example, a program copying files from an NFS mount could be tricked into copying from outside the intended source directory, and/or to a location outside the intended destination directory.

The advisory is available at freebsd.org. This vulnerability is handled as CVE-2024-6759. The exploitation is known to be difficult. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/13/2024). This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

Applying a patch is able to eliminate this problem.

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Productinfo

Type

• Operating System

Name

• FreeBSD

License

• open-source

Website

• Product: https://www.freebsd.org/

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