LHa: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200409-13 / lha
Release Date	September 08, 2004
Latest Revision	October 20, 2006: 02
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-arch/lha	revision <= 114i-r3	revision >= 114i-r4	All supported architectures

Related bugreports: #62618

Synopsis

Several buffer overflows and a shell metacharacter command execution vulnerability have been found in LHa. These vulnerabilities can be used to execute arbitrary code.

2. Impact Information

Background

LHa is a console-based program for packing and unpacking LHarc archives.

Description

The command line argument as well as the archive parsing code of LHa lack sufficient bounds checking. Furthermore, a shell meta character command execution vulnerability exists in LHa, since it does no proper filtering on directory names.

Impact

Using a specially crafted command line argument or archive, an attacker can cause a buffer overflow and could possibly run arbitrary code. The shell meta character command execution could lead to the execution of arbitrary commands by an attacker using directories containing shell meta characters in their names.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All LHa users should upgrade to the latest stable version:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=app-arch/lha-114i-r4"
# emerge ">=app-arch/lha-114i-r4"

4. References

Updated September 08, 2004

Summary: This is a Gentoo Linux Security Advisory

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