5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2024-22365

CVE-2024-22365: linux-pam (aka Linux PAM) before 1.6.0 allows attackers to cause a denial of service (blocked...

linux-pam (aka Linux PAM) before 1.6.0 allows attackers to cause a denial of service (blocked login process) via mkfifo because the openat call (for protect_dir) lacks O_DIRECTORY.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2024-22365

CVE-2024-22365:

5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The commit 031bb5a5d0d950253b68138b498dc93be69a64cb directly addresses the vulnerability. The patch modifies the protect_dir function in modules/pam_namespace/pam_namespace.c. The core of the vulnerability lies in how protect_dir used openat. Before the patch, openat was called with flags = O_RDONLY. If the path pointed to a FIFO, openat would block. The patch changes flags to O_RDONLY | O_DIRECTORY, which causes openat to fail if the path is not a directory, thus preventing the blocking behavior and the DoS. The removed code block, which manually checked if the opened path was a directory using fstat and S_ISDIR, further confirms that protect_dir was the function handling the problematic logic.

Vulnerable functions

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WAF Rule

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Reasoning

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