SUSE Security Announcement: nfs-server/rpc.mountd remote code execution (SUSE-SA:2006:005)

26 Jan 2006

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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                nfs-server
        Announcement ID:        SUSE-SA:2006:005
        Date:                   Thu, 26 Jan 2006 14:00:00 +0000
        Affected Products:      SUSE LINUX 10.0
                                SUSE LINUX 9.3
                                SUSE LINUX 9.2
                                SUSE LINUX 9.1
        Vulnerability Type:     remote code execution
        Severity (1-10):        7
        SUSE Default Package:   no
        Cross-References:       CVE-2006-0043

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             remote code execution in rpc.mountd of nfs-server
           Problem Description
        2) Solution or Work-Around
        3) Special Instructions and Notes
        4) Package Location and Checksums
        5) Pending Vulnerabilities, Solutions, and Work-Arounds:
            See SUSE Security Summary Report.
        6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

   An remotely exploitable problem exists in the rpc.mountd service in
   the user space NFS server package "nfs-server".

   Insufficient buffer space supplied to the realpath() function
   when processing mount requests can lead to a buffer overflow in
   the rpc.mountd and allows remote attackers to execute code as the
   root user.

   Code execution is definitely possible if the attacker can create
   symlinks on any of the file systems on the machine running rpc.mountd
   (/tmp , /home/attacker or similar).
   For attackers without filesystem access code execution is potentially
   possible.

   NOTE:
   The "nfs-server" package is obsolete and has been replaced by the
   "nfs-utils" package (kernel NFS server) in all currently supported
   SUSE Linux products already and is only included for completeness.
   The "nfs-utils" package itself is NOT affected by this problem.

   This issue is tracked by the Mitre CVE ID CVE-2006-0043.

2) Solution or Work-Around

   If you are still using the old user space nfs-server package, consider
   switching to the kernel level nfs-utils package which is not affected
   by this problem.

   If you are not using NFS serving at all, deinstall the RPM.

   Otherwise install the updated packages.

3) Special Instructions and Notes

   None.

4) Package Location and Checksums

   The preferred method for installing security updates is to use the YaST
   Online Update (YOU) tool. YOU detects which updates are required and
   automatically performs the necessary steps to verify and install them.
   Alternatively, download the update packages for your distribution manually
   and verify their integrity by the methods listed in Section 6 of this
   announcement. Then install the packages using the command

     rpm -Fhv <file.rpm>

   to apply the update, replacing <file.rpm> with the filename of the
   downloaded RPM package.

   x86 Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/nfs-server-2.2beta51-212.2.i586.rpm
          5e37fe16b2c59ecd4f5296ab63710080

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/nfs-server-2.2beta51-209.2.i586.rpm
          12d423a4df41149131c184ba98cd139f

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/nfs-server-2.2beta51-208.2.i586.rpm
          4df2803717ec4404204f2550c3aa8240

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/nfs-server-2.2beta51-206.4.i586.rpm
          0e4b9814cfc427d708ed664fcb2d5e83

   Power PC Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/nfs-server-2.2beta51-212.2.ppc.rpm
          e64aa29d0b1cdbf8c7801592df9bf199

   x86-64 Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/nfs-server-2.2beta51-212.2.x86_64.rpm
          961bef35240193e56c5f3bf6828611c8

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/nfs-server-2.2beta51-209.2.x86_64.rpm
          8cacbd583e70f204897f5f4449f4dedd

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/nfs-server-2.2beta51-208.2.x86_64.rpm
          24a0186b5f57fadd1fb7753e416d3d2a

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/nfs-server-2.2beta51-206.4.x86_64.rpm
          33b5dddc7a9e717fa229661efa9592d5

   Sources:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/nfs-server-2.2beta51-212.2.src.rpm
          2fc9d81e214d444cb305f8a485930a48

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/nfs-server-2.2beta51-209.2.src.rpm
          3d21171dda052e1e744d08ba7dd39742

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/nfs-server-2.2beta51-208.2.src.rpm
          0f7c7a1eea16a9eb1c444c54805d9ccd

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/nfs-server-2.2beta51-206.4.src.rpm
          e88cb3eae24d151197fc2a3e7731fd71
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/nfs-server-2.2beta51-206.4.src.rpm
          bceb7a43b4ad42cec21be4da14988d45

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

   See SUSE Security Summary Report.
______________________________________________________________________________

6) Authenticity Verification and Additional Information

  - Announcement authenticity verification:

    SUSE security announcements are published via mailing lists and on Web
    sites. The authenticity and integrity of a SUSE security announcement is
    guaranteed by a cryptographic signature in each announcement. All SUSE
    security announcements are published with a valid signature.

    To verify the signature of the announcement, save it as text into a file
    and run the command

      gpg --verify <file>

    replacing <file> with the name of the file where you saved the
    announcement. The output for a valid signature looks like:

      gpg: Signature made <DATE> using RSA key ID 3D25D3D9
      gpg: Good signature from "SuSE Security Team <security@suse.de>"

    where <DATE> is replaced by the date the document was signed.

    If the security team's key is not contained in your key ring, you can
    import it from the first installation CD. To import the key, use the
    command

      gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

  - Package authenticity verification:

    SUSE update packages are available on many mirror FTP servers all over the
    world. While this service is considered valuable and important to the free
    and open source software community, the authenticity and the integrity of
    a package needs to be verified to ensure that it has not been tampered
    with.

    There are two verification methods that can be used independently from
    each other to prove the authenticity of a downloaded file or RPM package:

    1) Using the internal gpg signatures of the rpm package
    2) MD5 checksums as provided in this announcement

    1) The internal rpm package signatures provide an easy way to verify the
       authenticity of an RPM package. Use the command

        rpm -v --checksig <file.rpm>

       to verify the signature of the package, replacing <file.rpm> with the
       filename of the RPM package downloaded. The package is unmodified if it
       contains a valid signature from build@suse.de with the key ID 9C800ACA.

       This key is automatically imported into the RPM database (on
       RPMv4-based distributions) and the gpg key ring of 'root' during
       installation. You can also find it on the first installation CD and at
       the end of this announcement.

    2) If you need an alternative means of verification, use the md5sum
       command to verify the authenticity of the packages. Execute the command

         md5sum <filename.rpm>

       after you downloaded the file from a SUSE FTP server or its mirrors.
       Then compare the resulting md5sum with the one that is listed in the
       SUSE security announcement. Because the announcement containing the
       checksums is cryptographically signed (by security@suse.de), the
       checksums show proof of the authenticity of the package if the
       signature of the announcement is valid. Note that the md5 sums
       published in the SUSE Security Announcements are valid for the
       respective packages only. Newer versions of these packages cannot be
       verified.

  - SUSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   General Linux and SUSE security discussion.
            All SUSE security announcements are sent to this list.
            To subscribe, send an e-mail to
                <suse-security-subscribe@suse.com>.

    suse-security-announce@suse.com
        -   SUSE's announce-only mailing list.
            Only SUSE's security announcements are sent to this list.
            To subscribe, send an e-mail to
                <suse-security-announce-subscribe@suse.com>.

    For general information or the frequently asked questions (FAQ),
    send mail to <suse-security-info@suse.com> or
    <suse-security-faq@suse.com>.

    =====================================================================
    SUSE's security contact is <security@suse.com> or <security@suse.de>.
    The <security@suse.de> public key is listed below.
    =====================================================================
______________________________________________________________________________

    The information in this advisory may be distributed or reproduced,
    provided that the advisory is not modified in any way. In particular, the
    clear text signature should show proof of the authenticity of the text.

    SUSE Linux Products GmbH provides no warranties of any kind whatsoever
    with respect to the information contained in this security advisory.

Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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Marcus Meissner

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