October 2006

ID: 00670
Ref: 642/2006
Date: 02 October 2006:15:02:19
Version: 1

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Title: OpenPKG Security Advisory: OpenPKG-SA-2006.022 - openssh
Abstract: According to a vendor security advisory [0], multiple vulnerabilities exist in the Secure Shell (SSH) implementation OpenSSH [1].
Vendors affected: OpenPkg
Operating systems affected: OpenPkg
Applications affected: OpenPkg

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Title
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OpenPKG Security Advisory: OpenPKG-SA-2006.022 - openssh

Detail
======

According to a vendor security advisory [0], multiple vulnerabilities
exist in the Secure Shell (SSH) implementation OpenSSH [1].



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________________________________________________________________________

http://www.openpkg.org/security/ http://www.openpkg.org
openpkg-security@openpkg.org openpkg@openpkg.org
OpenPKG-SA-2006.022 01-Oct-2006
________________________________________________________________________

Package: openssh
Vulnerability: denial of service
OpenPKG Specific: no

OpenPKG Series: Affected Packages: Corrected Packages:
CURRENT <= openssh-4.3p2-20060924 >= openssh-4.4p1-20060928
2-STABLE <= openssh-4.3p2-2.20060622 >= openssh-4.4p1-2.20060929
2-STABLE-20060622 <= openssh-4.3p2-2.20060622 >= openssh-4.4p1-2.20060929
2.5-RELEASE <= openssh-4.2p1-2.5.3 >= openssh-4.2p1-2.5.4

Description:
According to a vendor security advisory [0], multiple vulnerabilities
exist in the Secure Shell (SSH) implementation OpenSSH [1]:

First, a pre-authentication denial of service was found by Tavis
Ormandy that would cause sshd(8) to spin until the login grace time
expired. The Common Vulnerabilities and Exposures (CVE) project
assigned the ids CVE-2006-4924 [2] and CVE-2006-4925 [3] to the
problem.

Second, an unsafe signal handler, reported by Mark Dowd, was fixed.
The signal handler was vulnerable to a race condition that could be
exploited to perform a pre-authentication denial of service. This
vulnerability could theoretically lead to pre-authentication remote
code execution if some authentication methods like GSSAPI are enabled,
but the likelihood of successful exploitation appears remote. The
Common Vulnerabilities and Exposures (CVE) project assigned the id
CVE-2006-5051 [4] to the problem.
________________________________________________________________________

References:
[0] http://www.openssh.com/txt/release-4.4
[1] http://www.openssh.com/
[2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4924
[3] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4925
[4] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5051
________________________________________________________________________

For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG " (ID 63C4CB9F) of the
OpenPKG project which you can retrieve from http://pgp.openpkg.org and
hkp://pgp.openpkg.org. Follow the instructions on http://pgp.openpkg.org
for details on how to verify the integrity of this advisory.
________________________________________________________________________

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