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Vigil@nce: pam_mount, mounting without restrictions

September 2008 by Vigil@nce

A local attacker can use the pam_mount module to mount directories with no restriction.

- Gravity: 1/4
- Consequences: data reading, data creation/edition
- Provenance: user shell
- Means of attack: 1 attack
- Ability of attacker: technician (2/4)
- Confidence: confirmed by the editor (5/5)
- Diffusion of the vulnerable configuration: medium (2/3)
- Creation date: 08/09/2008
- Identifier: VIGILANCE-VUL-8095

IMPACTED PRODUCTS

- Unix - plateform

DESCRIPTION

The pam_mount module (Pluggable Authentication Module) mounts a directory when user is authenticated.

The "luserconf" configuration directive indicates the filename ( /.pam_mount.conf.xml) containing directories that user wishes to mount. Normally, user should only be allowed to mount directories that he owns. However, the code doing this check was incorrectly suppressed.

A local attacker can therefore use his luserconf file to mount directories to which he can normally not access.

CHARACTERISTICS

- Identifiers: BID-31041, VIGILANCE-VUL-8095
- Url: https://vigilance.aql.fr/tree/1/8095




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