UnAce: Buffer overflow and directory traversal vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200502-32 / unace
Release Date	February 28, 2005
Latest Revision	February 28, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-arch/unace	<= 1.2b, >= 2.0	revision >= 1.2b-r1	All supported architectures

Related bugreports: #81958

Synopsis

UnAce is vulnerable to several buffer overflow and directory traversal attacks.

2. Impact Information

Background

UnAce is an utility to extract, view and test the contents of an ACE archive.

Description

Ulf Harnhammar discovered that UnAce suffers from buffer overflows when testing, unpacking or listing specially crafted ACE archives (CAN-2005-0160). He also found out that UnAce is vulnerable to directory traversal attacks, if an archive contains "./.." sequences or absolute filenames (CAN-2005-0161).

Impact

An attacker could exploit the buffer overflows to execute malicious code or the directory traversals to overwrite arbitrary files.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All UnAce users should upgrade to the latest available 1.2 version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/unace-1.2b-r1"

4. References

Page updated February 28, 2005

Summary: This is a Gentoo Linux Security Advisory

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