unarj: Long filenames buffer overflow and a path traversal vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200411-29 / unarj
Release Date	November 19, 2004
Latest Revision	November 19, 2004: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-arch/unarj	< 2.63a-r2	>= 2.63a-r2	All supported architectures

Related bugreports: #70966

Synopsis

unarj contains a buffer overflow and a directory traversal vulnerability. This could lead to overwriting of arbitrary files or the execution of arbitrary code.

2. Impact Information

Background

unarj is an ARJ archive decompressor.

Description

unarj has a bounds checking vulnerability within the handling of long filenames in archives. It also fails to properly sanitize paths when extracting an archive (if the "x" option is used to preserve paths).

Impact

An attacker could trigger a buffer overflow or a path traversal by enticing a user to open an archive containing specially-crafted path names, potentially resulting in the overwrite of files or execution of arbitrary code with the permissions of the user running unarj.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All unarj users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/unarj-2.63a-r2"

4. References

Page updated November 19, 2004

Summary: This is a Gentoo Linux Security Advisory

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