SUSE Security Announcement: openssh (SUSE-SA:2006:008)

14 Feb 2006

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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                openssh
        Announcement ID:        SUSE-SA:2006:008
        Date:                   Tue, 14 Feb 2006 11:00:00 +0000
        Affected Products:      SUSE LINUX 10.0
                                SUSE LINUX 9.3
                                SUSE LINUX 9.2
                                SUSE LINUX 9.1
                                SuSE Linux Desktop 1.0
                                SuSE Linux Enterprise Server 8
                                SUSE SLES 9
                                UnitedLinux 1.0
        Vulnerability Type:     remote code execution
        Severity (1-10):        7
        SUSE Default Package:   yes
        Cross-References:       CVE-2006-0225

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             scp double expansion
           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

   A problem in the handling of scp in openssh could be used to execute
   commands on remote hosts even using a scp-only configuration.

   This requires doing a remote-remote scp and a hostile server. (CVE-2006-0225)

   On SUSE Linux Enterprise Server 9 the xauth pollution problem was fixed too.

   The security fix changes the handling of quoting filenames which might
   break automated scripts using this functionality.

   Please check that your automated scp scripts still work after the
   update.

2) Solution or Work-Around

   There is no known workaround, please install the update packages.

3) Special Instructions and Notes

   Please restart the sshd service after the update.

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/openssh-4.1p1-10.4.i586.rpm
          3b4e0557d7d0a2b1d23b2c426af95df9
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/openssh-askpass-4.1p1-10.4.i586.rpm
          ac11a5ad265e171674485961472baaaf

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/openssh-3.9p1-12.4.i586.rpm
          2c6d16e14134a1a4f1aaba9ac4aef97f
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/openssh-askpass-3.9p1-12.4.i586.rpm
          4cab20c7e83f6de0e440383939e69ec5

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/openssh-3.9p1-3.6.i586.rpm
          9b8cf778290ac743fd07445799f79b1f
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/openssh-askpass-3.9p1-3.6.i586.rpm
          003115e216c2b36da09ec3679744ba3d

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/openssh-4.1p1-11.16.i586.rpm
          6e89bdd71e10933bf8e95dc7fad0c289
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/openssh-askpass-4.1p1-11.16.i586.rpm
          3d0446f739bcea3715e6945d253b0d53

   Power PC Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/openssh-4.1p1-10.4.ppc.rpm
          3970357da536041d1ae3f7e42655aac7
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/openssh-askpass-4.1p1-10.4.ppc.rpm
          6a79a95ece5bc7738998adad11205f2f

   x86-64 Platform:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/openssh-4.1p1-10.4.x86_64.rpm
          e9eec927db0859a76851d1b94fa7923d
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/openssh-askpass-4.1p1-10.4.x86_64.rpm
          b4a2b9cf969794d1deb1abd07f192786

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/openssh-3.9p1-12.4.x86_64.rpm
          65416ca8578374fa4db63ed9e67f41a3
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/openssh-askpass-3.9p1-12.4.x86_64.rpm
          3fef6bb43541532a654b09dd46201f69

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/openssh-3.9p1-3.6.x86_64.rpm
          3373a79ef05695446f72fdc1a3ec2d44
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/openssh-askpass-3.9p1-3.6.x86_64.rpm
          37ac73c4c9a7723fdcaeb16671b4c6b9

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/openssh-4.1p1-11.16.x86_64.rpm
          d04d20e03a63676d5c3349c382318194
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/openssh-askpass-4.1p1-11.16.x86_64.rpm
          ea0deb3eef9970963af2c8c0adce6a7b

   Sources:

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/openssh-4.1p1-10.4.src.rpm
          97ffd38b1144c4797d474c7de1eb6f51

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/openssh-3.9p1-12.4.src.rpm
          1d43324b9d51941bf60e8e0bcbfa25c7

   SUSE LINUX 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/openssh-3.9p1-3.6.src.rpm
          647e4b45eba8dd5399c30dcb64db0c91

   SUSE LINUX 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/openssh-4.1p1-11.16.src.rpm
          cf86431c7c2b1b0b58f6a5f4fff92893
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/openssh-4.1p1-11.16.src.rpm
          c04ea03236cd9955c5f21f8c15a35416

   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/c0a0e2dc54359361...
   http://portal.suse.com/psdb/c0a0e2dc5435936145cde433208b0b1b.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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Marcus Meissner

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