CVE-2024-2746

Technical Description

Incomplete fix for CVE-2024-1929

The problem with CVE-2024-1929 was that the dnf5 D-Bus daemon accepted arbitrary configuration parameters from unprivileged users, which allowed a

local root exploit by tricking the daemon into loading a user controlled "plugin". All of this happened before Polkit authentication was even started.

The dnf5 library code does not check whether non-root users control the directory in question. 

On one hand, this poses a Denial-of-Service attack vector by making the daemonoperate on a blocking file (e.g. named FIFO special file) or a very large file

that causes an out-of-memory situation (e.g. /dev/zero). On the other hand, this can be used to let the daemon process privileged files like /etc/shadow.

The file in question is parsed as an INI file. Error diagnostics resulting from parsing privileged files could cause information leaks, if these diagnostics

are accessible to unprivileged users. In the case of libdnf5, no such user accessible diagnostics shou

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References