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Vigil@nce: AIX, file creation via _LIB_INIT_DBG

August 2009 by Vigil@nce

A local attacker can use _LIB_INIT_DBG and a suid root program, in order to create a file owned by root.

Severity: 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: high (3/3)

Creation date: 05/08/2009

IMPACTED PRODUCTS

- IBM AIX

DESCRIPTION OF THE VULNERABILITY

The _LIB_INIT_DBG and _LIB_INIT_DBG_FILE environment variables are used to debug applications linked to libc.a or libC.a. Debugging information is stored in the file indicated by _LIB_INIT_DBG_FILE.

However, if a suid root program is debugged, the debug file is created with root privileges (instead to loosing privileges to those of the current user).

A local attacker can therefore use _LIB_INIT_DBG and a suid root program, in order to create a file owned by root.

CHARACTERISTICS

Identifiers: BID-35934, VIGILANCE-VUL-8917

http://vigilance.fr/vulnerability/A...




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