glsa-200412-01.xml


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

<glsa id="200412-01">
  <title>rssh, scponly: Unrestricted command execution</title>
  <synopsis>
    rssh and scponly do not filter command-line options that can be exploited
    to execute any command, thereby allowing a remote user to completely bypass
    the restricted shell.
  </synopsis>
  <product type="ebuild">scponly</product>
  <announced>December 03, 2004</announced>
  <revised>May 22, 2006: 03</revised>
  <bug>72815</bug>
  <bug>72816</bug>
  <access>remote</access>
  <affected>
    <package name="net-misc/scponly" auto="yes" arch="*">
      <unaffected range="ge">4.0</unaffected>
      <vulnerable range="lt">4.0</vulnerable>
    </package>
    <package name="app-shells/rssh" auto="yes" arch="*">
      <unaffected range="ge">2.2.3</unaffected>
      <vulnerable range="le">2.2.2</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    rssh and scponly are two restricted shells, allowing only a few
    predefined commands. They are often used as a complement to OpenSSH to
    provide access to remote users without providing any remote execution
    privileges.
    </p>
  </background>
  <description>
    <p>
    Jason Wies discovered that when receiving an authorized command from an
    authorized user, rssh and scponly do not filter command-line options
    that can be used to execute any command on the target host.
    </p>
  </description>
  <impact type="normal">
    <p>
    Using a malicious command, it is possible for a remote authenticated
    user to execute any command (or upload and execute any file) on the
    target machine with user rights, effectively bypassing any restriction
    of scponly or rssh.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All scponly users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=net-misc/scponly-4.0&quot;</code>
    <p>
    All rssh users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=app-shells/rssh/rssh-2.2.3&quot;</code>
  </resolution>
  <references>
    <uri link="http://www.securityfocus.com/archive/1/383046/2004-11-30/2004-12-06/0">BugTraq Posting</uri>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1161">CVE-2004-1161</uri>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1162">CVE-2004-1162</uri>
  </references>
  <metadata tag="requester" timestamp="Wed,  1 Dec 2004 09:03:59 +0000">
    koon
  </metadata>
  <metadata tag="submitter" timestamp="Thu,  2 Dec 2004 13:01:44 +0000">
    koon
  </metadata>
  <metadata tag="bugReady" timestamp="Fri,  3 Dec 2004 13:57:43 +0000">
    koon
  </metadata>
</glsa>