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Vigil@nce: Screen, file corruption via screen-exchange

March 2009 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

A local attacker can create a symbolic link in order to corrupt a
file with privileges of Screen users.

Gravity: 1/4

Consequences: data creation/edition

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: medium (2/3)

Creation date: 25/03/2009

IMPACTED PRODUCTS
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The Screen program is used to split a console in several areas.

The screen-exchange feature saves a buffer in the
/tmp/screen-exchange file, which is shared between several users.

However, this shared file is created without checking if a
symbolic link is present. A local attacker can therefore create a
link from /tmp/screen-exchange to a sensitive file in order to
force its corruption with rights of Screen users.

A local attacker can thus create a symbolic link in order to
corrupt a file with privileges of Screen users.

CHARACTERISTICS

Identifiers: 25296, VIGILANCE-VUL-8561
http://vigilance.fr/vulnerability/Screen-file-corruption-via-screen-exchange-8561


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