unp: Arbitrary command execution

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200801-01 / remote
Release Date	January 09, 2008
Latest Revision	January 09, 2008: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-arch/unp	< 1.0.14	>= 1.0.14	All supported architectures

Related bugreports: #203106

Synopsis

unp allows execution of arbitrary code via malicious file names.

2. Impact Information

Background

unp is a script for unpacking various file formats.

Description

Erich Schubert from Debian discovered that unp does not escape file names properly before passing them to calls of the shell.

Impact

A remote attacker could entice a user or automated system to unpack a compressed archive with a specially crafted file name, leading to the execution of shell commands from within the filename. That code will be executed with the privileges of the user running unp.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All unp users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/unp-1.0.14"

4. References

CVE-2007-6610

Updated January 09, 2008

Summary: This is a Gentoo Linux Security Advisory

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