SUSE Security Announcement: pwdutils, shadow (SUSE-SA:2005:064)

4 Nov 2005

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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                pwdutils, shadow
        Announcement ID:        SUSE-SA:2005:064
        Date:                   Fri, 04 Nov 2005 14:00:00 +0000
        Affected Products:      SUSE LINUX 10.0
                                SUSE LINUX 9.3
                                SUSE LINUX 9.2
                                SUSE LINUX 9.1
                                SuSE Linux 9.0
                                SuSE Linux Desktop 1.0
                                SuSE Linux Enterprise Server 8
                                SUSE SLES 9
                                UnitedLinux 1.0
        Vulnerability Type:     local privilege escalation
        Severity (1-10):        7
        SUSE Default Package:   yes
        Cross-References:       -

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             pwdutils privilege escalation
           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

   Thomas Gerisch found that the setuid 'chfn' program contained in the
   pwdutils suite insufficiently checks it's arguments when changing
   the GECOS field. This bug leads to a trivially exploitable local
   privilege escalation that allows users to gain root access.

   We like to thank Thomas Gerisch for pointing out the problem.

2) Solution or Work-Around

   Removing the setuid bit from /usr/bin/chfn renders chfn useless but
   also prevents successful exploitation. Note that this workaround
   only lasts until the next run of SuSEconfig which will restore the
   setuid bit if you are on permissions level 'easy' or 'secure'.

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/pwdutils-3.0.4-4.2.i586.rpm
          385e9ef4f03e67ddb50a6a21d5b9f0e9

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/pwdutils-2.6.96-4.2.i586.rpm
          4705772232599de3a2d9dc83c922ee47

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/pwdutils-2.6.90-6.2.i586.rpm
          aae77d1eab9d617be89ab993f9f8a47d

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/pwdutils-2.6.4-2.18.3.i586.rpm
          5e957e0370ac82874979e0c02187517e

   SuSE Linux 9.0:
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/shadow-4.0.3-267.i586.rpm
          8cf127c4d2e74f17cf0ff058f4feaf00

   Power PC Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/pwdutils-3.0.4-4.2.ppc.rpm
          533274d92b8375bc51b6a3684c1cf506

   x86-64 Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/pwdutils-3.0.4-4.2.x86_64.rpm
          cc54040195f24925474d1896c45ccb30

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/pwdutils-2.6.96-4.2.x86_64.rpm
          785543d9276bd5de611ce0e82bc3c066

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/pwdutils-2.6.90-6.2.x86_64.rpm
          82b384b4d65189c2af84677d7fc02dba

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/pwdutils-2.6.4-2.18.3.x86_64.rpm
          f5d860c203d8dc5c6b85318229fe68d8

   SuSE Linux 9.0:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/shadow-4.0.3-267.x86_64.rpm
          384136f520ebf09d3be779291da92c8d

   Sources:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/pwdutils-3.0.4-4.2.src.rpm
          f4b6aedde6cf93e1fe5b47bda874e72a

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/pwdutils-2.6.96-4.2.src.rpm
          cb0d28c88ecf013418234ed39ff87e85

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/pwdutils-2.6.90-6.2.src.rpm
          e8854e2433279f4a2650d354a07f3605

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/pwdutils-2.6.4-2.18.3.src.rpm
          81453f140a633eeb0b0a841b857e49a5
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/pwdutils-2.6.4-2.18.3.src.rpm
          7f5d161dae57bf1fb64cd39269b5255c

   SuSE Linux 9.0:
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/shadow-4.0.3-267.src.rpm
          6cc9c84bdea5f04c290c55c942327bb0
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/shadow-4.0.3-267.src.rpm
          d463b528a727655b392230302d998976

   Our maintenance customers are notified individually. The packages are
   offered for installation from the maintenance web:

   http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/185153682667ec68...
   http://portal.suse.com/psdb/185153682667ec6862eeea0f4622dde5.html
   http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/53225e252af46c1f...
   http://portal.suse.com/psdb/53225e252af46c1f6a71fe03f1d76317.html

______________________________________________________________________________

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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Ludwig Nussel

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