UnZip: User-assisted execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200804-06 / unzip
Release Date	April 06, 2008
Latest Revision	April 06, 2008: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-arch/unzip	< 5.52-r2	>= 5.52-r2	All supported architectures

Related bugreports: #213761

Synopsis

A double free vulnerability discovered in UnZip might lead to the execution of arbitrary code.

2. Impact Information

Background

Info-ZIP's UnZip is a tool to list and extract files inside PKZIP compressed files.

Description

Tavis Ormandy of the Google Security Team discovered that the NEEDBITS macro in the inflate_dynamic() function in the file inflate.c can be invoked using invalid buffers, which can lead to a double free.

Impact

Remote attackers could entice a user or automated system to open a specially crafted ZIP file that might lead to the execution of arbitrary code or a Denial of Service.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All UnZip users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/unzip-5.52-r2"

4. References

CVE-2008-0888

Page updated April 06, 2008

Summary: This is a Gentoo Linux Security Advisory

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