(Gentoo Issues Fix) lha Buffer Overflows Let Remote Users Create Malicious Archives to Execute Arbitrary Code
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SecurityTracker Alert ID: 1010100 |
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SecurityTracker URL: http://securitytracker.com/id/1010100
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CVE Reference:
CAN-2004-0234, CAN-2004-0235
(Links to External Site)
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Date: May 10 2004
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Impact:
Execution of arbitrary code via network, Modification of system information, Modification of user information, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Description:
Several vulnerabilities were reported in the 'lha' LHarc archive processor. A remote user can create a malicious archive that will execute arbitrary code or write files to other directories on the system.
Red Hat reported that there are two stack buffer overflows and two directory traversal flaws in LHA.
A remote user can create a specially crafted LHA archive that, when loaded by the target user, will execute arbitrary code on the target user's system.
A remote user can also create a specially crafted LHA archive that, when expanded by the target user, will create files on the target user's system in a location outside of the current directory.
Ulf Harnhammar is credited with discovering these flaws.
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Impact:
A remote user can create an archive that, when processed by a target user, will execute arbitrary code on the target user's system with the privileges of the target user or will create files on the target user's system that are located outside of the expected directory.
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Solution:
Gentoo has released a fix and indicates that 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"
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Cause:
Access control error, Boundary error, Input validation error
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Underlying OS:
Linux (Gentoo)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Sun, 09 May 2004 19:40:16 +0200
Subject: [gentoo-announce] [ GLSA 200405-02 ] Multiple vulnerabilities in LHa
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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Gentoo Linux Security Advisory GLSA 200405-02
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http://security.gentoo.org/
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Severity: High
Title: Multiple vulnerabilities in LHa
Date: May 09, 2004
Bugs: #49961
ID: 200405-02
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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
-------------------------------------------------------------------
1 app-arch/lha <= 114i-r1 >= 114i-r2
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
==========
[ 1 ] CAN-2004-0234
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0234
[ 2 ] CAN-2004-0235
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0235
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
http://bugs.gentoo.org.
License
=======
Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/1.0
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