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SuSE: 2011-035: Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
SuSE The implementation of the blowfish based password hashing method had a bug affecting passwords that contain 8bit characters (e.g. umlauts). Affected passwords are potentially faster to crack via brute force methods (CVE-2011-2483). [More...]
______________________________________________________________________________

                        SUSE Security Announcement

        Package:                glibc,pam-modules,libxcrypt,pwdutils
        Announcement ID:        SUSE-SA:2011:035
        Date:                   Tue, 23 Aug 2011 13:00:00 +0000
        Affected Products:      openSUSE 11.3
                                openSUSE 11.4
                                SUSE SLES 9
                                Open Enterprise Server
                                Novell Linux POS 9
                                SLE SDK 10 SP3
                                SUSE Linux Enterprise Server 10 SP3
                                SUSE Linux Enterprise Software Development Kit 11 SP1
                                SUSE Linux Enterprise Desktop 11 SP1
                                SUSE Linux Enterprise Server 11 SP1
                                SUSE Linux Enterprise Desktop 10 SP4
                                SLE SDK 10 SP4
                                SUSE Linux Enterprise Server 10 SP4
        Vulnerability Type:     weak password hashing algorithm
        CVSS v2 Base Score:     5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
        SUSE Default Package:   yes
        Cross-References:       CVE-2011-2483

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             glibc security update
           Problem Description
        2) Solution or Work-Around
        3) Special Instructions and Notes
        4) Package Location and Checksums
        5) Pending Vulnerabilities, Solutions, and Work-Arounds:
            none
        6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

   The implementation of the blowfish based password hashing method had
   a bug affecting passwords that contain 8bit characters (e.g.
   umlauts).  Affected passwords are potentially faster to crack via
   brute force methods (CVE-2011-2483).
   
   SUSE's crypt() implementation supports the blowfish password hashing
   function (id $2a) and system logins by default also use this method.
   This update eliminates the bug in the $2a implementation. After
   installing the update existing $2a hashes therefore no longer match
   hashes generated with the new, correct implementation if the
   password contains 8bit characters. For system logins via PAM the
   pam_unix2 module activates a compat mode and keeps processing
   existing $2a hashes with the old algorithm. This ensures no user
   gets locked out. New password hashes are created with the id "$2y"
   to unambiguously identify them as generated with the correct
   implementation.
   
   Services that do not use PAM but do use crypt() to store passwords
   using the blowfish hash do not have such a compat mode. That means
   users with 8bit passwords that use such services will not be able to
   log in anymore after the update. As workaround administrators may
   edit the service's password database and change stored hashes from
   $2a to $2x. This will result in crypt() using the old algorithm.
   Users should be required to change their passwords to make sure they
   are migrated to the correct algorithm.
   
   FAQ:
   
   Q: I only use ASCII characters in passwords, am I a affected in any
      way?
   A: No.
   
   Q: What's the meaning of the ids before and after the update?
   A: Before the update:
      $2a -> buggy algorithm
   
      After the update:
      $2x -> buggy algorithm
      $2a -> correct algorithm
      $2y -> correct algorithm
   
      System logins using PAM have a compat mode enabled by default:
      $2x -> buggy algorithm
      $2a -> buggy algorithm
      $2y -> correct algorithm
   
   Q: How do I require users to change their password on next login?
   A: Run the following command as root for each user:
      chage -d 0 
   
   Q: I run an application that has $2a hashes in it's password database. Some
      users complain that they can not log in anymore.
   A: Edit the password database and change the "$2a" prefix of the affected users'
      hashes to "$2x". They will be able to log in again but should change their
      password ASAP.
   
   Q: How do I turn off the compat mode for system logins?
   A: Set BLOWFISH_2a2x=no in /etc/default/passwd

2) Solution or Work-Around

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

3) Special Instructions and Notes

   To actually migrate hashes to the new algorithm all users with
   8bit characters in passwords must change passwords after the
   update.

4) Package Location and Checksums

   The preferred method for installing security updates is to use the YaST
   "Online Update" module or the "zypper" commandline tool. The package and
   patch management stack will detect which updates are required and
   automatically perform 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 

   to apply the update, replacing  with the filename of the
   downloaded RPM package.

   
   x86 Platform:
   
   openSUSE 11.4:
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-devel-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-html-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-i18ndata-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-info-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-locale-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-obsolete-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/glibc-profile-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/libxcrypt-3.0.3-9.10.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/libxcrypt-devel-3.0.3-9.10.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/nscd-2.11.3-12.17.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/pam-modules-11.4-3.4.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/pwdutils-3.2.14-4.5.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/pwdutils-plugin-audit-3.2.14-4.5.1.i586.rpm
   http://download.opensuse.org/update/11.4/rpm/i586/pwdutils-rpasswd-3.2.14-4.5.1.i586.rpm
   
   openSUSE 11.3:
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-devel-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-html-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-i18ndata-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-info-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-locale-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-obsolete-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/glibc-profile-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/libxcrypt-3.0.3-5.3.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/libxcrypt-devel-3.0.3-5.3.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/nscd-2.11.2-3.5.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/pam-modules-11.3-0.3.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/pwdutils-3.2.10-2.3.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/pwdutils-plugin-audit-3.2.10-2.3.1.i586.rpm
   http://download.opensuse.org/update/11.3/rpm/i586/pwdutils-rpasswd-3.2.10-2.3.1.i586.rpm
   
   x86 Platform:
   
   openSUSE 11.4:
   http://download.opensuse.org/update/11.4/rpm/i686/glibc-2.11.3-12.17.1.i686.rpm
   http://download.opensuse.org/update/11.4/rpm/i686/glibc-devel-2.11.3-12.17.1.i686.rpm
   
   openSUSE 11.3:
   http://download.opensuse.org/update/11.3/rpm/i686/glibc-2.11.2-3.5.1.i686.rpm
   http://download.opensuse.org/update/11.3/rpm/i686/glibc-devel-2.11.2-3.5.1.i686.rpm
   
   x86-64 Platform:
   
   openSUSE 11.4:
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-32bit-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-devel-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-devel-32bit-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-html-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-i18ndata-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-info-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-locale-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-locale-32bit-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-obsolete-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-profile-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/glibc-profile-32bit-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/libxcrypt-3.0.3-9.10.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/libxcrypt-32bit-3.0.3-9.10.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/libxcrypt-devel-3.0.3-9.10.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/nscd-2.11.3-12.17.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/pam-modules-11.4-3.4.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/pam-modules-32bit-11.4-3.4.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/pwdutils-3.2.14-4.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/pwdutils-plugin-audit-3.2.14-4.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/pwdutils-rpasswd-3.2.14-4.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.4/rpm/x86_64/pwdutils-rpasswd-32bit-3.2.14-4.5.1.x86_64.rpm
   
   openSUSE 11.3:
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-32bit-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-devel-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-devel-32bit-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-html-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-i18ndata-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-info-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-locale-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-locale-32bit-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-obsolete-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-profile-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/glibc-profile-32bit-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/libxcrypt-3.0.3-5.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/libxcrypt-32bit-3.0.3-5.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/libxcrypt-devel-3.0.3-5.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/nscd-2.11.2-3.5.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/pam-modules-11.3-0.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/pam-modules-32bit-11.3-0.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/pwdutils-3.2.10-2.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/pwdutils-plugin-audit-3.2.10-2.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/pwdutils-rpasswd-3.2.10-2.3.1.x86_64.rpm
   http://download.opensuse.org/update/11.3/rpm/x86_64/pwdutils-rpasswd-32bit-3.2.10-2.3.1.x86_64.rpm
   
   Sources:
   
   openSUSE 11.4:
   http://download.opensuse.org/update/11.4/rpm/src/glibc-2.11.3-12.17.1.nosrc.rpm
   http://download.opensuse.org/update/11.4/rpm/src/glibc-2.11.3-12.17.1.src.rpm
   http://download.opensuse.org/update/11.4/rpm/src/libxcrypt-3.0.3-9.10.1.src.rpm
   http://download.opensuse.org/update/11.4/rpm/src/pam-modules-11.4-3.4.1.src.rpm
   http://download.opensuse.org/update/11.4/rpm/src/pwdutils-3.2.14-4.5.1.src.rpm
   
   openSUSE 11.3:
   http://download.opensuse.org/update/11.3/rpm/src/glibc-2.11.2-3.5.1.nosrc.rpm
   http://download.opensuse.org/update/11.3/rpm/src/glibc-2.11.2-3.5.1.src.rpm
   http://download.opensuse.org/update/11.3/rpm/src/libxcrypt-3.0.3-5.3.1.src.rpm
   http://download.opensuse.org/update/11.3/rpm/src/pam-modules-11.3-0.3.1.src.rpm
   http://download.opensuse.org/update/11.3/rpm/src/pwdutils-3.2.10-2.3.1.src.rpm
   
   Our maintenance customers are notified individually. The packages are
   offered for installation from the maintenance web:
   
   SUSE Linux Enterprise Server 10 SP4
     http://download.novell.com/patch/finder/?keywords=8e9ceee14766a579acb89753eac6018f
   
   SLE SDK 10 SP4
     http://download.novell.com/patch/finder/?keywords=8e9ceee14766a579acb89753eac6018f
   
   SUSE Linux Enterprise Desktop 10 SP4
     http://download.novell.com/patch/finder/?keywords=8e9ceee14766a579acb89753eac6018f
   
   SLE SDK 10 SP3
     http://download.novell.com/patch/finder/?keywords=953879412f2611d0c50fcaee712c9779
   
   SUSE Linux Enterprise Server 10 SP3
     http://download.novell.com/patch/finder/?keywords=953879412f2611d0c50fcaee712c9779
   
   SUSE Linux Enterprise Server 11 SP1
     http://download.novell.com/patch/finder/?keywords=77013a29c4a8ec72e720b000b88f4b70
   
   SUSE Linux Enterprise Desktop 11 SP1
     http://download.novell.com/patch/finder/?keywords=77013a29c4a8ec72e720b000b88f4b70
   
   SUSE Linux Enterprise Software Development Kit 11 SP1
     http://download.novell.com/patch/finder/?keywords=77013a29c4a8ec72e720b000b88f4b70
   
   Open Enterprise Server
     http://download.novell.com/patch/finder/?keywords=9461d1e81594a5e74d3886c3bbeb79ba
   
   Novell Linux POS 9
     http://download.novell.com/patch/finder/?keywords=9461d1e81594a5e74d3886c3bbeb79ba
   
   SUSE SLES 9
     http://download.novell.com/patch/finder/?keywords=9461d1e81594a5e74d3886c3bbeb79ba

______________________________________________________________________________

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

   none
______________________________________________________________________________

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 

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

      gpg: Signature made  using RSA key ID 3D25D3D9
      gpg: Good signature from "SuSE Security Team "

    where  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.

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

     rpm -v --checksig 

    to verify the signature of the package, replacing  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.

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

    opensuse-security@opensuse.org
        -   General Linux and SUSE security discussion.
            All SUSE security announcements are sent to this list.
            To subscribe, send an e-mail to
                .

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

    =====================================================================
    SUSE's security contact is  or .
    The  public key is listed below.
    =====================================================================
______________________________________________________________________________
 
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