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Vigil@nce: Solaris, file corruption via dircmp

April 2009 by Vigil@nce

A local attacker can alter a file with privileges of a dircmp user.

 Severity: 1/4
 Consequences: 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: high (3/3)
 Creation date: 01/04/2009

IMPACTED PRODUCTS

 OpenSolaris
 Sun Solaris
 Sun Trusted Solaris

DESCRIPTION OF THE VULNERABILITY

The /usr/bin/dircmp script is used to compare two directories.

This script stores differences in temporary files starting by
"/usr/tmp/dc$$". However, these filenames are predictable, files
are stored in a public directory and the script does not check if
a symbolic link is present.

A local attacker can therefore create a symbolic link in order to
alter a file with privileges of a dircmp user.

CHARACTERISTICS

 Identifiers: 253468, 6633566, BID-34316, VIGILANCE-VUL-8583
 Url: http://vigilance.fr/vulnerability/Solaris-file-corruption-via-dircmp-8583


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