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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200611-06">
<title>OpenSSH: Multiple Denial of Service vulnerabilities</title>
Several Denial of Service vulnerabilities have been identified in OpenSSH.
<product type="ebuild">openssh</product>
<announced>November 13, 2006</announced>
<revised>November 13, 2006: 01</revised>
<package name="net-misc/openssh" auto="yes" arch="*">
<unaffected range="ge">4.4_p1-r5</unaffected>
<vulnerable range="lt">4.4_p1-r5</vulnerable>
OpenSSH is a complete SSH protocol version 1.3, 1.5 and 2.0
implementation and includes sftp client and server support.
Tavis Ormandy of the Google Security Team has discovered a
pre-authentication vulnerability, causing sshd to spin until the login
grace time has been expired. Mark Dowd found an unsafe signal handler
that was vulnerable to a race condition. It has also been discovered
that when GSSAPI authentication is enabled, GSSAPI will in certain
cases incorrectly abort.
<impact type="normal">
The pre-authentication and signal handler vulnerabilities can cause a
Denial of Service in OpenSSH. The vulnerability in the GSSAPI
authentication abort could be used to determine the validity of
usernames on some platforms.
There is no known workaround at this time.
All OpenSSH users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-misc/openssh-4.4_p1-r5&quot;</code>
<uri link="">CVE-2006-5051</uri>
<uri link="">CVE-2006-5052</uri>
<uri link="">OpenSSH Security Advisory</uri>
<metadata tag="requester" timestamp="Mon, 06 Nov 2006 00:03:31 +0000">
<metadata tag="bugReady" timestamp="Mon, 06 Nov 2006 12:18:14 +0000">
<metadata tag="submitter" timestamp="Mon, 06 Nov 2006 19:31:09 +0000">