Cert advisory for Solaris 2.5.1, 2.6, 7, and 8
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Thread: Cert advisory for Solaris 2.5.1, 2.6, 7, and 8

  1. #1
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    Cert advisory for Solaris 2.5.1, 2.6, 7, and 8

    CERT Advisory CA-2002-11 Heap Overflow in Cachefs Daemon (cachefsd)

    Original release date: May 06, 2002
    Last revised:
    Source: CERT/CC

    A complete revision history can be found at the end of this file.

    Systems Affected

    * Sun Solaris 2.5.1, 2.6, 7, and 8 (SPARC and Intel Architectures)

    Overview

    Sun's NFS/RPC file system cachefs daemon (cachefsd) is shipped and
    installed by default with Sun Solaris 2.5.1, 2.6, 7, and 8 (SPARC and
    Intel architectures). A remotely exploitable vulnerability exists in
    cachefsd that could permit a remote attacker to execute arbitrary code
    with the privileges of the cachefsd, typically root. The CERT/CC has
    received credible reports of scanning and exploitation of Solaris
    systems running cachefsd.

    I. Description

    A remotely exploitable heap overflow exists in the cachefsd program
    shipped and installed by default with Sun Solaris 2.5.1, 2.6, 7, and 8
    (SPARC and Intel architectures). Cachefsd caches requests for
    operations on remote file systems mounted via the use of NFS protocol.
    A remote attacker can send a crafted RPC request to the cachefsd
    program to exploit the vulnerability.

    Logs of exploitation attempts may resemble the following:


    May 16 22:46:08 victim-host inetd[600]: /usr/lib/fs/cachefs/cachefsd:
    Segmentation Fault - core dumped

    May 16 22:46:21 victim-host last message repeated 7 times

    May 16 22:46:22 victim-host inetd[600]: /usr/lib/fs/cachefs/cachefsd:
    Bus Error- core dumped

    May 16 22:46:24 victim-host inetd[600]: /usr/lib/fs/cachefs/cachefsd:
    Segmentation Fault - core dumped

    May 16 22:46:56 victim-host inetd[600]: /usr/lib/fs/cachefs/cachefsd:
    Bus Error - core dumped

    May 16 22:46:59 victim-host last message repeated 1 time

    May 16 22:47:02 victim-host inetd[600]: /usr/lib/fs/cachefs/cachefsd:
    Segmentation Fault - core dumped

    May 16 22:47:07 victim-host last message repeated 3 times

    May 16 22:47:09 victim-host inetd[600]: /usr/lib/fs/cachefs/cachefsd:
    Hangup

    May 16 22:47:11 victim-host inetd[600]: /usr/lib/fs/cachefs/cachefsd:
    Segmentation Fault - core dumped


    According a Sun Alert Notification, failed attempts to exploit this
    vulnerability may leave a core dump file in the root directory. The
    presence of the core file does not preclude the success of subsequent
    attacks. Additionally, if the file /etc/cachefstab exists, it may
    contain unusual entries.

    This issue is also being referenced as CAN-2002-0085:

    http://cve.mitre.org/cgi-bin/cvename...=CAN-2002-0085

    The Australian Computer Emergency Response Team has also issued an
    advisory related to incident activity exploiting cachefsd:

    http://www.auscert.org.au/Informatio...AA-2002.01.txt

    II. Impact

    A remote attacker may be able to execute code with the privileges of
    the cachefsd process, typically root.

    III. Solution

    Apply a patch from your vendor

    Appendix A contains information provided by vendors for this advisory.

    If a patch is not available, disable cachefsd in inetd.conf until a
    patch can be applied.

    If disabling the cachefsd is not an option, follow the suggested
    workaround in the Sun Alert Notification.

    Appendix A. - Vendor Information

    This appendix contains information provided by vendors for this
    advisory. As vendors report new information to the CERT/CC, we will
    update this section and note the changes in our revision history. If a
    particular vendor is not listed below, please check the Vulnerability
    Note (VU#635811) or contact your vendor directly.

    IBM

    IBM's AIX operating system, all versions, is not vulnerable.

    SGI

    SGI does not ship with SUN cachefsd, so IRIX is not vulnerable.

    Sun

    See the Sun Alert Notification available at
    http://sunsolve.sun.com/pub-cgi/retr...alert%2F44309.
    _________________________________________________________________

    The CERT/CC acknowledges the eSecurity Online Team for discovering and
    reporting on this vulnerability and thanks Sun Microsystems for their
    technical assistance.
    _________________________________________________________________

    Feedback can be directed to the authors:
    Jason A. Rafail and Jeffrey S. Havrilla
    ______________________________________________________________________

    This document is available from:
    http://www.cert.org/advisories/CA-2002-11.html
    ______________________________________________________________________

    CERT/CC Contact Information

    Email: cert@cert.org
    Phone: +1 412-268-7090 (24-hour hotline)
    Fax: +1 412-268-6989
    Postal address:
    CERT Coordination Center
    Software Engineering Institute
    Carnegie Mellon University
    Pittsburgh PA 15213-3890
    U.S.A.

    CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) /
    EDT(GMT-4) Monday through Friday; they are on call for emergencies
    during other hours, on U.S. holidays, and on weekends.

    Using encryption

    We strongly urge you to encrypt sensitive information sent by email.
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    http://www.cert.org/CERT_PGP.key

    If you prefer to use DES, please call the CERT hotline for more
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    Getting security information

    CERT publications and other security information are available from
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    http://www.cert.org/

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    * "CERT" and "CERT Coordination Center" are registered in the U.S.
    Patent and Trademark Office.
    ______________________________________________________________________

    NO WARRANTY
    Any material furnished by Carnegie Mellon University and the Software
    Engineering Institute is furnished on an "as is" basis. Carnegie
    Mellon University makes no warranties of any kind, either expressed or
    implied as to any matter including, but not limited to, warranty of
    fitness for a particular purpose or merchantability, exclusivity or
    results obtained from use of the material. Carnegie Mellon University
    does not make any warranty of any kind with respect to freedom from
    patent, trademark, or copyright infringement.
    _________________________________________________________________

    Conditions for use, disclaimers, and sponsorship information

    Copyright 2002 Carnegie Mellon University.

    Revision History
    May 06, 2002: Initial release
    America - Land of the free, home of the brave.

  2. #2
    Senior Member
    Join Date
    Apr 2002
    Posts
    712
    Many people have said it... many times... many ways... people don't listen...

    NFS IS EVIL!


    Perhaps about the only more-evil, similiar technology, is that little piece of SMB... *grin*
    \"Windows has detected that a gnat has farted in the general vicinity. You must reboot for changes to take affect. Reboot now?\"

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