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