LHa: Multiple vulnerabilities

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.

Workaround

There is no known workaround at this time.

Resolution

All LHa users should upgrade to the latest stable version:

 # emerge sync

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