glsa-200407-10.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200407-10">
  <title>rsync: Directory traversal in rsync daemon</title>
  <synopsis>
    Under specific conditions, the rsync daemon is vulnerable to a directory
    traversal allowing to write files outside a sync module.
  </synopsis>
  <product type="ebuild">rsync</product>
  <announced>2004-07-12</announced>
  <revised count="01">2004-07-12</revised>
  <bug>49534</bug>
  <access>remote</access>
  <affected>
    <package name="net-misc/rsync" auto="yes" arch="*">
      <unaffected range="ge">2.6.0-r2</unaffected>
      <vulnerable range="le">2.6.0-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    rsync is a utility that provides fast incremental file transfers. It is
    used to efficiently synchronize files between hosts and is used by emerge
    to fetch Gentoo's Portage tree. rsyncd is the rsync daemon, which listens
    to connections from rsync clients.
    </p>
  </background>
  <description>
    <p>
    When rsyncd is used without chroot ("use chroot = false" in the rsyncd.conf
    file), the paths sent by the client are not checked thoroughly enough. If
    rsyncd is used with read-write permissions ("read only = false"), this
    vulnerability can be used to write files anywhere with the rights of the
    rsyncd daemon. With default Gentoo installations, rsyncd runs in a chroot,
    without write permissions and with the rights of the "nobody" user.
    </p>
  </description>
  <impact type="normal">
    <p>
    On affected configurations and if the rsync daemon runs under a privileged
    user, a remote client can exploit this vulnerability to completely
    compromise the host.
    </p>
  </impact>
  <workaround>
    <p>
    You should never set the rsync daemon to run with "use chroot = false". If
    for some reason you have to run rsyncd without a chroot, then you should
    not set "read only = false".
    </p>
  </workaround>
  <resolution>
    <p>
    All users should update to the latest version of the rsync package.
    </p>
    <code>
    # emerge sync

    # emerge -pv "&gt;=net-misc/rsync-2.6.0-r2"
    # emerge "&gt;=net-misc/rsync-2.6.0-r2"</code>
  </resolution>
  <references>
    <uri link="https://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0426">CAN-2004-0426</uri>
  </references>
  <metadata tag="submitter">
    koon
  </metadata>
</glsa>