(Gentoo Issues Fix) FireHOL Unsafe Temporary Files Let Local Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1013059 |
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SecurityTracker URL: http://securitytracker.com/id/1013059
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Feb 2 2005
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Impact:
Modification of system information, Modification of user information, Root access via local system, User access via local system
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 1.214
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Description:
A vulnerability was reported in FireHOL. A local user may be able to gain elevated privileges.
Sam Couter reported that FireHOL uses temporary files with known filenames in a temporary directory that has a predicatble name based on the process ID.
A local user can create a symbolic link (symlink) from a critical file on the system to a temporary file to be used by FireHOL. Then, when a target user runs FireHOL, the symlinked file may be overwritten with the privileges of the target user.
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Impact:
A local user may be able to gain elevated privileges.
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Solution:
Gentoo has released a fix and indicates that all FireHOL users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-firewall/firehol-1.224"
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Vendor URL: firehol.sourceforge.net/ (Links to External Site)
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Cause:
Access control error, State 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: Tue, 1 Feb 2005 22:36:03 +0100
Subject: [gentoo-announce] [ GLSA 200502-01 ] FireHOL: Insecure temporary file creation
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Gentoo Linux Security Advisory GLSA 200502-01
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http://security.gentoo.org/
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Severity: Normal
Title: FireHOL: Insecure temporary file creation
Date: February 01, 2005
Bugs: #79330
ID: 200502-01
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Synopsis
========
FireHOL is vulnerable to symlink attacks, potentially allowing a local
user to overwrite arbitrary files.
Background
==========
FireHOL is an iptables rules generator.
Affected packages
=================
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Package / Vulnerable / Unaffected
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1 net-firewall/firehol < 1.224 >= 1.224
Description
===========
FireHOL insecurely creates temporary files with predictable names.
Impact
======
A local attacker could create malicious symbolic links to arbitrary
system files. When FireHOL is executed, this could lead to these files
being overwritten with the rights of the user launching FireHOL,
usually the root user.
Workaround
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There is no known workaround at this time.
Resolution
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All FireHOL users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-firewall/firehol-1.224"
References
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[ 1 ] FireHOL CVS log
http://cvs.sourceforge.net/viewcvs.py/firehol/firehol/firehol.sh
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200502-01.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 2005 Gentoo Foundation, 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/2.0
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