Severity: 2/4
 Consequences: privileged access/rights
 Provenance: user shell
 Means of attack: no proof of concept, no attack
 Ability of attacker: expert (4/4)
 Confidence: confirmed by the editor (5/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 23/02/2010

IMPACTED PRODUCTS

 Mandriva Enterprise Server
 Mandriva Linux
 Red Hat Enterprise Linux
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The "runas_default" directive of the /etc/sudoers file defines a default user. For example, if the file contains: Defaults runas_default=test the user can enter: sudo command instead of: sudo -u test command

However, when this option is used, the user stays a member of root’s groups (root, bin, daemon, sys, adm, disk, wheel), instead of becoming a member of groups of user "test".

When the /etc/sudoers file contains "runas_default", a local attacker can therefore execute a command with privileges of root’s groups.

CHARACTERISTICS

 Identifiers: CVE-2010-0427, MDVSA-2010:052, RHSA-2010:0122-01, VIGILANCE-VUL-9469
 Url: http://vigilance.fr/vulnerability/s...