Advisories, September 27, 2006

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Gentoo Linux

Gentoo Linux Security Advisory GLSA 200609-17

http://security.gentoo.org/

Severity: Normal
Title: OpenSSH: Denial of Service
Date: September 27, 2006
Bugs: #148228
ID: 200609-17

Synopsis

A flaw in the OpenSSH daemon allows remote unauthenticated
attackers to cause a Denial of Service.

Background

OpenSSH is a free suite of applications for the SSH protocol,
developed and maintained by the OpenBSD project.

Affected packages

     Package           /   Vulnerable   /                   Unaffected

  1  net-misc/openssh      < 4.3_p2-r5                    >= 4.3_p2-r5

Description

Tavis Ormandy of the Google Security Team discovered a Denial of
Service vulnerability in the SSH protocol version 1 CRC
compensation attack detector.

Impact

A remote unauthenticated attacker may be able to trigger
excessive CPU usage by sending a pathological SSH message, denying
service to other legitimate users or processes.

Workaround

The system administrator may disable SSH protocol version 1 in
/etc/ssh/sshd_config.

Resolution

All OpenSSH users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/openssh-4.3_p2-r3"

References

[ 1 ] CVE-2006-4924

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4924

Availability

This GLSA and any updates to it are available for viewing at the
Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200609-17.xml

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 2006 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/2.5

rPath Linux

rPath Security Advisory: 2006-0174-1
Published: 2006-09-27
Products: rPath Linux 1
Rating: Minor
Exposure Level Classification: Remote Deterministic Denial of
Service
Updated Versions:
gnome-ssh-askpass=/conary.rpath.com@rpl:devel//1/4.2p1-2.2-1

openssh=/conary.rpath.com@rpl:devel//1/4.2p1-2.2-1

openssh-client=/conary.rpath.com@rpl:devel//1/4.2p1-2.2-1

openssh-server=/conary.rpath.com@rpl:devel//1/4.2p1-2.2-1

References:

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4924

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4925

https://issues.rpath.com/browse/RPL-661

Description:

Previous versions of the openssh package are vulnerable to a
remote denial of service attack that cause the server to consume
CPU when presented with certain data. They also have a bug (not a
vulnerability) that causes the client to crash harmlessly instead
of exiting cleanly under some attacks; this is not a vulnerability
but is also fixed in this update.

Web Webster

Web Webster has more than 20 years of writing and editorial experience in the tech sector. He’s written and edited news, demand generation, user-focused, and thought leadership content for business software solutions, consumer tech, and Linux Today, he edits and writes for a portfolio of tech industry news and analysis websites including webopedia.com, and DatabaseJournal.com.