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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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