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Vigil@nce: sudo, privilege elevation

March 2010 by Vigil@nce

A local attacker, allowed to execute sudoedit, can execute
commands with root privileges.

 Severity: 2/4
 Consequences: administrator access/rights
 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: high (3/3)
 Creation date: 23/02/2010

IMPACTED PRODUCTS

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

DESCRIPTION OF THE VULNERABILITY

The sudo program is used to allow users to execute some commands
with privileges of other users. For example, to allow the edition
of a file with root privileges:
user ALL = sudoedit filename
The sudoedit command does not have a full path (/bin/sudoedit),
because it is a pseudo-command, which is interpreted especially.

However, since sudo version 1.6.9, if a real command has this
name, this rule is also applied. This real command is thus run
with root privileges.

A local attacker, allowed to execute sudoedit, can therefore
execute commands with root privileges.

CHARACTERISTICS

 Identifiers: CVE-2010-0426, MDVSA-2010:049, RHSA-2010:0122-01,
VIGILANCE-VUL-9468
 Url: http://vigilance.fr/vulnerability/sudo-privilege-elevation-9468


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