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Vigil@nce - AIX: privilege escalation via Malloc

July 2014 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

A local attacker can force a suid/sgid application on AIX to
create a file with a privileged user/group, in order to escalate
his privileges.

Impacted products: AIX

Severity: 2/4

Creation date: 01/07/2014

DESCRIPTION OF THE VULNERABILITY

Functions of the Malloc family are used by programs to allocate
memory.

The MALLOCOPTIONS and MALLOCBUCKETS environment variables alter
the behavior of Malloc functions. The "bucket_statistics:path"
option indicates the path of the file where to write statistics on
Buckets (frequent allocation of small areas).

Suid/sgid programs use Malloc functions. However, the library does
not drop its privileges, before creating the statistic file.

A local attacker can therefore force a suid/sgid application on
AIX to create a file with a privileged user/group, in order to
escalate his privileges.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/AIX-privilege-escalation-via-Malloc-14956


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