GNUMP3d: Directory traversal and insecure temporary file creation

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200511-16 / GNUMP3d
Release Date	November 21, 2005
Latest Revision	August 21, 2007: 02
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-sound/gnump3d	< 2.9_pre7	>= 2.9_pre7	All supported architectures

Related bugreports: #111990

Synopsis

Two vulnerabilities have been identified in GNUMP3d allowing for limited directory traversal and insecure temporary file creation.

2. Impact Information

Background

GNUMP3d is a streaming server for MP3s, OGG vorbis files, movies and other media formats.

Description

Ludwig Nussel from SUSE Linux has identified two vulnerabilities in GNUMP3d. GNUMP3d fails to properly check for the existence of /tmp/index.lok before writing to the file, allowing for local unauthorized access to files owned by the user running GNUMP3d. GNUMP3d also fails to properly validate the "theme" GET variable from CGI input, allowing for unauthorized file inclusion.

Impact

An attacker could overwrite files owned by the user running GNUMP3d by symlinking /tmp/index.lok to the file targeted for overwrite. An attacker could also include arbitrary files by traversing up the directory tree (at most two times, i.e. "../..") with the "theme" GET variable.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All GNUMP3d users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-sound/gnump3d-2.9_pre7"

4. References

Page updated November 21, 2005

Summary: This is a Gentoo Linux Security Advisory

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