[ GLSA 200407-10 ] rsync: Directory traversal in rsync daemon

From: Kurt Lieber (klieber_at_gentoo.org)
Date: 07/12/04

  • Next message: David Huecking: "Re: [Full-Disclosure] Firefox 0.92 DoS via TinyBMP"
    Date: Mon, 12 Jul 2004 13:51:29 +0000
    To: gentoo-announce@lists.gentoo.org
    
    
    

    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Gentoo Linux Security Advisory GLSA 200407-10
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                                http://security.gentoo.org/
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

      Severity: Normal
         Title: rsync: Directory traversal in rsync daemon
          Date: July 12, 2004
          Bugs: #49534
            ID: 200407-10

    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    Synopsis
    ========

    Under specific conditions, the rsync daemon is vulnerable to a
    directory traversal allowing to write files outside a sync module.

    Background
    ==========

    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.

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-misc/rsync <= 2.6.0-r1 >= 2.6.0-r2

    Description
    ===========

    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.

    Impact
    ======

    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.

    Workaround
    ==========

    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".

    Resolution
    ==========

    All users should update to the latest version of the rsync package.

        # emerge sync

        # emerge -pv ">=net-misc/rsync-2.6.0-r2"
        # emerge ">=net-misc/rsync-2.6.0-r2"

    References
    ==========

      [ 1 ] CAN-2004-0426
            http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0426

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

        http://security.gentoo.org/glsa/glsa-200407-10.xml

    Concerns?
    =========

    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users machines is of utmost
    importance to us. Any security concerns should be addressed to
    security@gentoo.org or alternatively, you may file a bug at
    http://bugs.gentoo.org.

    License
    =======

    Copyright 2004 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/1.0

    
    



  • Next message: David Huecking: "Re: [Full-Disclosure] Firefox 0.92 DoS via TinyBMP"