GLSA 200405-02: Multiple vulnerabilities in LHa

http://security.gentoo.org/

Severity:	high
Title:	Multiple vulnerabilities in LHa
Date:	05/09/2004
Bugs:	#49961
ID:	200405-02

Synopsis

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.

Background

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

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-arch/lha	114i-r1	>= 114i-r2	All supported architectures

Description

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.

Impact

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 remotely.

Workaround

There is no known workaround at this time. All users are advised to upgrade to the latest available version of LHa.

Resolution

All users of LHa should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=app-arch/lha-114i-r2"
    # emerge ">=app-arch/lha-114i-r2"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200405-02.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.