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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="200609-17">
  <title>OpenSSH: Denial of Service</title>
  <synopsis>
    A flaw in the OpenSSH daemon allows remote unauthenticated attackers to
    cause a Denial of Service.
  </synopsis>
  <product type="ebuild">openssh</product>
  <announced>September 27, 2006</announced>
  <revised>September 27, 2006: 02</revised>
  <bug>148228</bug>
  <access>remote</access>
  <affected>
    <package name="net-misc/openssh" auto="yes" arch="*">
      <unaffected range="ge">4.3_p2-r5</unaffected>
      <vulnerable range="lt">4.3_p2-r5</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    OpenSSH is a free suite of applications for the SSH protocol, developed
    and maintained by the OpenBSD project.
    </p>
  </background>
  <description>
    <p>
    Tavis Ormandy of the Google Security Team discovered a Denial of
    Service vulnerability in the SSH protocol version 1 CRC compensation
    attack detector.
    </p>
  </description>
  <impact type="normal">
    <p>
    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.
    </p>
  </impact>
  <workaround>
    <p>
    The system administrator may disable SSH protocol version 1 in
    /etc/ssh/sshd_config.
    </p>
  </workaround>
  <resolution>
    <p>
    All OpenSSH users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=net-misc/openssh-4.3_p2-r5&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4924">CVE-2006-4924</uri>
  </references>
  <metadata tag="submitter" timestamp="Thu, 21 Sep 2006 22:24:46 +0000">
    taviso
  </metadata>
  <metadata tag="bugReady" timestamp="Wed, 27 Sep 2006 16:06:09 +0000">
    vorlon078
  </metadata>
</glsa>