glsa-200406-18.xml


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

<glsa id="200406-18">
  <title>gzip: Insecure creation of temporary files</title>
  <synopsis>
    gzip contain a bug potentially allowing an attacker to execute arbitrary
    commands.
  </synopsis>
  <product type="ebuild">gzip</product>
  <announced>June 24, 2004</announced>
  <revised>May 22, 2006: 02</revised>
  <bug>54890</bug>
  <access>local</access>
  <affected>
    <package name="app-arch/gzip" auto="yes" arch="*">
      <unaffected range="ge">1.3.3-r4</unaffected>
      <vulnerable range="le">1.3.3-r3</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    gzip (GNU zip) is popular compression program. The included gzexe
    utility allows you to compress executables in place and have them
    automatically uncompress and execute when you run them.
    </p>
  </background>
  <description>
    <p>
    The script gzexe included with gzip contains a bug in the code that
    handles tempfile creation. If the creation of a temp file fails when
    using gzexe fails instead of bailing out it executes the command given
    as argument.
    </p>
  </description>
  <impact type="normal">
    <p>
    This could lead to priviege escalation by running commands under the
    rights of the user running the self extracting file.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time. All users are encouraged to
    upgrade to the latest available version.
    </p>
  </workaround>
  <resolution>
    <p>
    All gzip users should upgrade to the latest stable version:
    </p>
    <code>
    # emerge sync
    
    # emerge -pv &quot;&gt;=app-arch/gzip-1.3.3-r4&quot;
    # emerge &quot;&gt;=app-arch/gzip-1.3.3-r4&quot;</code>
    <p>
    Additionally, once the upgrade is complete, all self extracting files
    created with earlier versions gzexe should be recreated, since the
    vulnerability is actually embedded in those executables.
    </p>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0603">CVE-2004-0603</uri>
  </references>
  <metadata tag="submitter">
    jaervosz
  </metadata>
</glsa>