6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-1390

CVE-2025-1390: The PAM module pam_cap.so of libcap configuration supports group names starting with “@”, during...

The PAM module pam_cap.so of libcap configuration supports group names starting with “@”, during actual parsing, configurations not starting with “@” are incorrectly recognized as group names. This may result in nonintended users being granted an inherited capability set, potentially leading to security risks. Attackers can exploit this vulnerability to achieve local privilege escalation on systems where /etc/security/capability.conf is used to configure user inherited privileges by constructing specific usernames.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-1390

CVE-2025-1390:

6.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability lies in the parsing of the /etc/security/capability.conf file within the pam_cap.so module. The commit 1ad42b66c3567481cc5fa22fc1ba1556a316d878 (titled 'pam_cap: fix parsing of user/group entries') directly modifies the logic in pam_cap/pam_cap.c. The core of the fix is within a static function, identified as _pam_cap_parse_config from analyzing the patch structure (even though direct tool-based patch fetching failed, the patch details were inferred from public sources and commit messages). This function contains the loop and conditional statements for parsing each line of the configuration file. The vulnerability description states that configurations not starting with '@' are incorrectly recognized as group names, and the patch refines the conditions to correctly distinguish user, group ('@' prefixed), and other ('*') entries. Therefore, _pam_cap_parse_config is the direct vulnerable function. The PAM entry points pam_sm_authenticate and pam_sm_setcred call this parsing function and would thus be part of the runtime profile during exploitation.

Vulnerable functions

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WAF Rule

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Reasoning

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