BEAST: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200704-22 / BEAST
Release Date	April 27, 2007
Latest Revision	April 27, 2007: 01
Impact	low
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-sound/beast	< 0.7.1	>= 0.7.1	All supported architectures

Related bugreports: #163146

Synopsis

A vulnerability has been discovered in BEAST allowing for a Denial of Service.

2. Impact Information

Background

BEdevilled Audio SysTem is an audio compositor, supporting a wide range of audio formats.

Description

BEAST, which is installed as setuid root, fails to properly check whether it can drop privileges accordingly if seteuid() fails due to a user exceeding assigned resource limits.

Impact

A local user could exceed his resource limit in order to prevent the seteuid() call from succeeding. This may lead BEAST to keep running with root privileges. Then, the local user could use the "save as" dialog box to overwrite any file on the vulnerable system, potentially leading to a Denial of Service.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All BEAST users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-sound/beast-0.7.1"

4. References

Updated April 27, 2007

Summary: This is a Gentoo Linux Security Advisory

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