Articles / SuSE: New kernel packages f…

SuSE: New kernel packages fix local privilege escalation

This kernel update for SUSE Linux Enterprise 10 Service Pack 2 fixes various security problems. When creating a file, open()/creat() allowed the setgid bit to be set via the mode argument even when, due to the bsdgroups mount option or the file being created in a setgid directory, the new file's group is one which the user is not a member of. The ext[234] filesystem code failed to properly handle corrupted data structures. The S/390 ptrace code allowed local users to cause a denial of service (kernel panic) via the user-area-padding test from the ptrace test suite in 31-bit mode, which triggers an invalid dereference. The dio subsystem in the Linux kernel did not properly zero out the dio struct, which allows local users to cause a denial of service (OOPS), as demonstrated by a certain fio test. Updated packages are available from download.opensuse.org.
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______________________________________________________________________________

                       SUSE Security Announcement

       Package:                kernel
       Announcement ID:        SUSE-SA:2008:051
       Date:                   Tue, 21 Oct 2008 10:00:00 +0000
       Affected Products:      SLE SDK 10 SP2
                               SUSE Linux Enterprise Desktop 10 SP2
                               SUSE Linux Enterprise 10 SP2 DEBUGINFO
                               SUSE Linux Enterprise Server 10 SP2
       Vulnerability Type:     local privilege escalation
       Severity (1-10):        6
       SUSE Default Package:   yes
       Cross-References:       CVE-2007-6716, CVE-2008-1514, CVE-2008-3525
                               CVE-2008-3528, CVE-2008-4210

   Content of This Advisory:
       1) Security Vulnerability Resolved:
            Linux kernel security problems
          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

  This kernel update for SUSE Linux Enterprise 10 Service Pack 2 fixes
  various bugs and some security problems:

  CVE-2008-4210: When creating a file, open()/creat() allowed the setgid
  bit to be set via the mode argument even when, due to the bsdgroups
  mount option or the file being created in a setgid directory, the new
  file's group is one which the user is not a member of.  The local
  attacker could then use ftruncate() and memory-mapped I/O to turn
  the new file into an arbitrary binary and thus gain the privileges
  of this group, since these operations do not clear the setgid bit."

  CVE-2008-3528: The ext[234] filesystem code fails to properly handle
  corrupted data structures. With a mounted filesystem image or partition
  that have corrupted dir->i_size and dir->i_blocks, a user performing
  either a read or write operation on the mounted image or partition
  can lead to a possible denial of service by spamming the logfile.

  CVE-2008-1514: The S/390 ptrace code allowed local users to cause
  a denial of service (kernel panic) via the user-area-padding test
  from the ptrace test suite in 31-bit mode, which triggers an invalid
  dereference.

  CVE-2007-6716: fs/direct-io.c in the dio subsystem in the Linux kernel
  did not properly zero out the dio struct, which allows local users
  to cause a denial of service (OOPS), as demonstrated by a certain
  fio test.

  CVE-2008-3525: Added missing capability checks in sbni_ioctl().


  Also OCFS2 was updated to version v1.4.1-1.

  The full amount of changes can be reviewed in the RPM changelog.

2) Solution or Work-Around

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

3) Special Instructions and Notes

  Please restart the computer after installing 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 

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

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

  SUSE Linux Enterprise Desktop 10 SP2 for AMD64 and Intel EM64T
    http://download.novell.com/index.jsp?search=Search&keywords=51097d5d388421c6b5752d422c0c672a

  SUSE Linux Enterprise 10 SP2 DEBUGINFO for IBM zSeries 64bit
    http://download.novell.com/index.jsp?search=Search&keywords=71c0e4af01f2f5e4bd0f9f51370dcde8

  SUSE Linux Enterprise 10 SP2 DEBUGINFO for IBM POWER
    http://download.novell.com/index.jsp?search=Search&keywords=112e2d60fade685e1d5878ae21ce2bc0

  SUSE Linux Enterprise 10 SP2 DEBUGINFO for IPF
    http://download.novell.com/index.jsp?search=Search&keywords=f8a0975219658ddcd214ea7538810b92

  SUSE Linux Enterprise Server 10 SP2
    http://download.novell.com/index.jsp?search=Search&keywords=51097d5d388421c6b5752d422c0c672a
    http://download.novell.com/index.jsp?search=Search&keywords=71c0e4af01f2f5e4bd0f9f51370dcde8
    http://download.novell.com/index.jsp?search=Search&keywords=112e2d60fade685e1d5878ae21ce2bc0
    http://download.novell.com/index.jsp?search=Search&keywords=f8a0975219658ddcd214ea7538810b92
    http://download.novell.com/index.jsp?search=Search&keywords=1f60f6114b5878d38c45087bbe9d5f99

  SLE SDK 10 SP2
    http://download.novell.com/index.jsp?search=Search&keywords=51097d5d388421c6b5752d422c0c672a
    http://download.novell.com/index.jsp?search=Search&keywords=112e2d60fade685e1d5878ae21ce2bc0
    http://download.novell.com/index.jsp?search=Search&keywords=f8a0975219658ddcd214ea7538810b92
    http://download.novell.com/index.jsp?search=Search&keywords=1f60f6114b5878d38c45087bbe9d5f99

  SUSE Linux Enterprise 10 SP2 DEBUGINFO
    http://download.novell.com/index.jsp?search=Search&keywords=51097d5d388421c6b5752d422c0c672a
    http://download.novell.com/index.jsp?search=Search&keywords=112e2d60fade685e1d5878ae21ce2bc0
    http://download.novell.com/index.jsp?search=Search&keywords=f8a0975219658ddcd214ea7538810b92
    http://download.novell.com/index.jsp?search=Search&keywords=1f60f6114b5878d38c45087bbe9d5f99

  SUSE Linux Enterprise Desktop 10 SP2
    http://download.novell.com/index.jsp?search=Search&keywords=51097d5d388421c6b5752d422c0c672a
    http://download.novell.com/index.jsp?search=Search&keywords=1f60f6114b5878d38c45087bbe9d5f99

  SUSE Linux Enterprise Desktop 10 SP2 for x86
    http://download.novell.com/index.jsp?search=Search&keywords=1f60f6114b5878d38c45087bbe9d5f99

______________________________________________________________________________

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 

   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.
   =====================================================================
______________________________________________________________________________

   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 
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key 

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