Multiple vulnerabilities in LHa
Gentoo Linux Security Advisory
||GLSA 200405-02 / lha
||May 09, 2004
||October 20, 2006: 02
All supported architectures
Two stack-based buffer overflows and two directory traversal problems have
been found in LHa. These vulnerabilities can be used to execute arbitrary
code or as a denial of service attack.
LHa is a console-based program for packing and unpacking LHarc archives.
Ulf Harnhammar found two stack overflows and two directory traversal
vulnerabilities in LHa version 1.14 and 1.17. A stack overflow occurs when
testing or extracting archives containing long file or directory names.
Furthermore, LHa doesn't contain sufficient protection against relative or
absolute archive paths.
The stack overflows can be exploited to execute arbitrary code with the
rights of the user testing or extracting the archive. The directory
traversal vulnerabilities can be used to overwrite files in the filesystem
with the rights of the user extracting the archive, potentially leading to
denial of service or privilege escalation. Since LHa is often interfaced to
other software like an email virus scanner, this attack can be used
There is no known workaround at this time. All users are advised to upgrade
to the latest available version of LHa.
All users of LHa should upgrade to the latest stable version:
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=app-arch/lha-114i-r2"
# emerge ">=app-arch/lha-114i-r2"