September 2005
Gentoo - Two Security Advisories
ID: 00816
Ref: 760/05
Date: 21 September 2005:14:20:12
Version: 1
Title: Gentoo - Two Security Advisories
Abstract: 1. Zebedee: Denial of Service vulnerability [GLSA 200509-14], 2. util-linux: umount command validation error [GLSA 200509-15]
Vendors affected: Gentoo
Operating systems affected: Gentoo
Applications affected: Gentoo
Title
=====
Gentoo - Two Security Advisories:
1. Zebedee: Denial of Service vulnerability [GLSA 200509-14]
2. util-linux: umount command validation error [GLSA 200509-15]
Detail
======
Security advisory summaries:
1. A bug in Zebedee allows a remote attacker to perform a Denial of
Service attack.
2. A command validation error in umount can lead to an escalation of
privileges.
Security advisory content follows:
1.
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Gentoo Linux Security Advisory GLSA 200509-14
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http://security.gentoo.org/
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Severity: Normal
Title: Zebedee: Denial of Service vulnerability
Date: September 20, 2005
Bugs: #105115
ID: 200509-14
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Synopsis
========
A bug in Zebedee allows a remote attacker to perform a Denial of
Service attack.
Background
==========
Zebedee is an application that establishes an encrypted, compressed
tunnel for TCP/IP or UDP data transfer between two systems.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/zebedee < 2.5.3 *>= 2.4.1-r1
>= 2.5.3
Description
===========
"Shiraishi.M" reported that Zebedee crashes when "0" is received as the
port number in the protocol option header.
Impact
======
By performing malformed requests a remote attacker could cause Zebedee
to crash.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All Zebedee users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose net-misc/zebedee
References
==========
[ 1 ] BugTraq ID 14796
http://www.securityfocus.com/bid/14796
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200509-14.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
2.
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Gentoo Linux Security Advisory GLSA 200509-15
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http://security.gentoo.org/
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Severity: High
Title: util-linux: umount command validation error
Date: September 20, 2005
Bugs: #105805
ID: 200509-15
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Synopsis
========
A command validation error in umount can lead to an escalation of
privileges.
Background
==========
util-linux is a suite of useful Linux programs including umount, a
program used to unmount filesystems.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-apps/util-linux < 2.12q-r3 >= 2.12q-r3
Description
===========
When a regular user mounts a filesystem, they are subject to
restrictions in the /etc/fstab configuration file. David Watson
discovered that when unmounting a filesystem with the '-r' option, the
read-only bit is set, while other bits, such as nosuid or nodev, are
not set, even if they were previously.
Impact
======
An unprivileged user facing nosuid or nodev restrictions can umount -r
a filesystem clearing those bits, allowing applications to be executed
suid, or have device nodes interpreted. In the case where the user can
freely modify the contents of the filesystem, privilege escalation may
occur as a custom program may execute with suid permissions.
Workaround
==========
Two workarounds exist, first, the suid bit can be removed from the
umount utility, or users can be restricted from mounting and unmounting
filesystems in /etc/fstab.
Resolution
==========
All util-linux users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/util-linux-2.12q-r3"
References
==========
[ 1 ] CAN-2005-2876
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2005-2876
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200509-15.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