glsa-200909-01.xml


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

<glsa id="200909-01">
  <title>Linux-PAM: Privilege escalation</title>
  <synopsis>
    An error in the handling of user names of Linux-PAM might allow remote
    attackers to cause a Denial of Service or escalate privileges.
  </synopsis>
  <product type="ebuild">pam</product>
  <announced>September 07, 2009</announced>
  <revised>September 07, 2009: 01</revised>
  <bug>261512</bug>
  <access>remote</access>
  <affected>
    <package name="sys-libs/pam" auto="yes" arch="*">
      <unaffected range="ge">1.0.4</unaffected>
      <vulnerable range="lt">1.0.4</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Linux-PAM (Pluggable Authentication Modules) is an architecture
    allowing the separation of the development of privilege granting
    software from the development of secure and appropriate authentication
    schemes.
    </p>
  </background>
  <description>
    <p>
    Marcus Granado repoted that Linux-PAM does not properly handle user
    names that contain Unicode characters. This is related to integer
    signedness errors in the pam_StrTok() function in libpam/pam_misc.c.
    </p>
  </description>
  <impact type="normal">
    <p>
    A remote attacker could exploit this vulnerability to cause a Denial of
    Service. A remote authenticated attacker could exploit this
    vulnerability to log in to a system with the account of a user that has
    a similar user name, but with non-ASCII characters.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All Linux-PAM users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=sys-libs/pam-1.0.4&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0887">CVE-2009-0887</uri>
  </references>
  <metadata tag="requester" timestamp="Fri, 10 Jul 2009 18:01:34 +0000">
    craig
  </metadata>
  <metadata tag="submitter" timestamp="Fri, 28 Aug 2009 16:33:27 +0000">
    a3li
  </metadata>
  <metadata tag="bugReady" timestamp="Mon, 31 Aug 2009 03:38:46 +0000">
    a3li
  </metadata>
</glsa>