Articles / SuSE: New Linux kernel pack…

SuSE: New Linux kernel packages fix security vulnerabilities

The SUSE Linux Enterprise 11 Service Pack 1 kernel was updated to 2.6.32.49 and fixes various bugs and security issues. The TCP/IP initial sequence number generation effectively only used 24 bits of 32 to generate randomness, making a brute force man-in-the-middle attack on TCP/IP connections feasible. The generator was changed to use full 32bit randomness. Fernando Gont discovered that the IPv6 stack used predictable fragment identification numbers. A remote attacker could exploit this to exhaust network resources, leading to a denial of service. A NULL ptr dereference on mounting corrupt hfs filesystems was fixed which could be used by local attackers to crash the kernel.

Added a kernel option to ensure ecryptfs is mounting only on paths belonging to the current ui, which would have allowed local attackers to potentially gain privileges via symlink attacks. The Generic Receive Offload (GRO) implementation in the Linux kernel allowed remote attackers to cause a denial of service via crafted VLAN packets that are processed by the napi_reuse_skb function, leading to a memory leak or memory corruption. A name overflow in the hfs filesystem was fixed, where mounting a corrupted hfs filesystem could lead to a stack overflow and code execution in the kernel. This requires a local attacker to be able to mount hfs filesystems.

A bug was found in the way headroom check was performed in udp6_ufo_fragment() function. A remote attacker could use this flaw to crash the system. Updated packages are available from download.opensuse.org.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

______________________________________________________________________________

                       SUSE Security Announcement

       Package:                kernel
       Announcement ID:        SUSE-SA:2011:046
       Date:                   Tue, 13 Dec 2011 17:00:00 +0000
       Affected Products:      SUSE Linux Enterprise High Availability Extension 11 SP1
                               SUSE Linux Enterprise Desktop 11 SP1
                               SUSE Linux Enterprise Server 11 SP1
       Vulnerability Type:     remote denial of service
       CVSS v2 Base Score:     5.7 (AV:A/AC:M/Au:N/C:N/I:N/A:C)
       SUSE Default Package:   yes
       Cross-References:       CVE-2011-1478, CVE-2011-1576, CVE-2011-1833
                               CVE-2011-2203, CVE-2011-2699, CVE-2011-3188
                               CVE-2011-4326, CVE-2011-4330

   Content of This Advisory:
       1) Security Vulnerability Resolved:
            Linux kernel 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 SUSE Linux Enterprise 11 Service Pack 1 kernel was updated to
  2.6.32.49 and fixes various bugs and security issues.

  Following security bugs were fixed:
  CVE-2011-3188: The TCP/IP initial sequence number generation
  effectively only used 24 bits of 32 to generate randomness, making
  a brute force man-in-the-middle attack on TCP/IP connections
  feasible. The generator was changed to use full 32bit randomness.

  CVE-2011-2699: Fernando Gont discovered that the IPv6 stack used
  predictable fragment identification numbers. A remote attacker
  could exploit this to exhaust network resources, leading to a denial
  of service.

  CVE-2011-2203: A NULL ptr dereference on mounting corrupt hfs
  filesystems was fixed which could be used by local attackers to crash
  the kernel.

  CVE-2011-1833: Added a kernel option to ensure ecryptfs is mounting
  only on paths belonging to the current ui, which would have allowed
  local attackers to potentially gain privileges via symlink attacks.

  CVE-2011-1576: The Generic Receive Offload (GRO) implementation in the
  Linux kernel allowed remote attackers to cause a denial of service
  via crafted VLAN packets that are processed by the napi_reuse_skb
  function, leading to (1) a memory leak or (2) memory corruption,
  a different vulnerability than CVE-2011-1478.

  CVE-2011-4330: A name overflow in the hfs filesystem was fixed, where
  mounting a corrupted hfs filesystem could lead to a stack overflow
  and code execution in the kernel. This requires a local attacker to
  be able to mount hfs filesystems.

  CVE-2011-4326: A bug was found in the way headroom check was performed
  in udp6_ufo_fragment() function. A remote attacker could use this
  flaw to crash the system.

  Following non-security bugs were fixed:
  - ALSA: hda - Fix S3/S4 problem on machines with VREF-pin mute-LED
    (bnc#732535).

  - patches.xen/xen-pcpu-hotplug: Fix a double kfree().

  - ixgbe: fix bug with vlan strip in promisc mode (bnc#687049,
    fate#311821).
  - ixgbe: fix panic when shutting down system with WoL enabled.

  - fnic: Allow users to modify dev_loss_tmo setting (bnc#719786).

  - x86, intel: Do not mark sched_clock() as stable (bnc#725709).

  - ALSA: hda - Keep vref-LED during power-saving on IDT codecs
    (bnc#731981).

  - cifs: Assume passwords are encoded according to iocharset
    (bnc#731035).

  - scsi_dh: Check queuedata pointer before proceeding (bnc#714744).

  - netback: use correct index for invalidation in netbk_tx_check_mop().

  - ACPI video: introduce module parameter
    video.use_bios_initial_backlight (bnc#731229).

  - SUNRPC: prevent task_cleanup running on freed xprt (bnc#709671).

  - add device entry for Broadcom Valentine combo card (bnc#722429).

  - quota: Fix WARN_ON in lookup_one_len (bnc#728626).

  - Update Xen patches to 2.6.32.48.
  - pv-on-hvm/kexec: add xs_reset_watches to shutdown watches from old
    kernel (bnc#694863).

  - x86: undo_limit_pages() must reset page count.

  - mm/vmstat.c: cache align vm_stat (bnc#729721).

  - s390/ccwgroup: fix uevent vs dev attrs race (bnc#659101,LTC#69028).

  - Warn on pagecache limit usage (FATE309111).

  - SCSI: st: fix race in st_scsi_execute_end (bnc#720536).

  - ACPI: introduce "acpi_rsdp=" parameter for kdump (bnc#717263).

  - elousb: Limit the workaround warning to one per error, control
  workaround activity (bnc#719916).

  - SCSI: libiscsi: reset cmd timer if cmds are making progress (bnc#691440).

  - SCSI: fix crash in scsi_dispatch_cmd() (bnc#724989).

  - NFS/sunrpc: do not use a credential with extra groups (bnc#725878).

  - s390/qdio: EQBS retry after CCQ 96 (bnc#725453,LTC#76117).

  - fcoe: Reduce max_sectors to 1024 (bnc#695898).

  - apparmor: return -ENOENT when there is no profile for a hat (bnc#725502).

  - sched, cgroups: disallow attaching kthreadd (bnc#721840).

  - nfs: Check validity of cl_rpcclient in nfs_server_list_show (bnc#717884).

  - x86, vt-d: enable x2apic opt out (disabling x2apic through BIOS flag)
    (bnc#701183, fate#311989).

  - block: Free queue resources at blk_release_queue() (bnc#723815).

  - ALSA: hda - Add post_suspend patch ops (bnc#724800).
  - ALSA: hda - Allow codec-specific set_power_state ops (bnc#724800).
  - ALSA: hda - Add support for vref-out based mute LED control on IDT
    codecs (bnc#724800).

  - scsi_dh_rdac : Add definitions for different RDAC operating modes (bnc#724365).
  - scsi_dh_rdac : Detect the different RDAC operating modes (bnc#724365).
  - scsi_dh_rdac : decide whether to send mode select based on operating mode (bnc#724365).
  - scsi_dh_rdac: Use WWID from C8 page instead of Subsystem id from
    C4 page to identify storage (bnc#724365).

  - vlan: Match underlying dev carrier on vlan add (bnc#722504).

  - scsi_lib: pause between error retries (bnc#675127).

  - xfs: use KM_NOFS for allocations during attribute list operations (bnc#721830).

  - bootsplash: Do not crash when no fb is set (bnc#723542).

  - cifs: do not allow cifs_iget to match inodes of the wrong type (bnc#711501).

  - cifs: fix noserverino handling when 1 extensions are enabled (bnc#711501).

  - cifs: reduce false positives with inode aliasing serverino autodisable (bnc#711501).

  - parport_pc: release IO region properly if unsupported ITE887x card
    is found (bnc#721464).

  - writeback: avoid unnecessary calculation of bdi dirty thresholds (bnc#721299).

  - 1: Fix bogus it_blocksize in VIO iommu code (bnc#717690).

  - ext4: Fix max file size and logical block counting of extent format
    file (bnc#706374).

  - novfs: Unable to change password in the Novell Client for Linux (bnc#713229).

  - xfs: add more ilock tracing.

  - sched: move wakeup tracepoint above out_running (bnc#712002).

  - config.conf: Build KMPs for the -trace flavor as well
    (fate#312759, bnc#712404, bnc#712405, bnc#721337).

  - memsw: remove noswapaccount kernel parameter (bnc#719450).

2) Solution or Work-Around

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

3) Special Instructions and Notes

  Please reboot the machine after installing 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 <file.rpm>

  to apply the update, replacing <file.rpm> 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 High Availability Extension 11 SP1
    http://download.novell.com/patch/finder/?keywords=d4b5f25f4db8718301e7e16715b81839
    http://download.novell.com/patch/finder/?keywords=31d452e9bdc91325cef696c4c54131ba
    http://download.novell.com/patch/finder/?keywords=f2bc63a432cbfc30adf058c05528c5fd
    http://download.novell.com/patch/finder/?keywords=0b7e04a54fedaae34f6309faa0744773
    http://download.novell.com/patch/finder/?keywords=836acbf4bd9c116e2d6a3b8cc8e914ff
    http://download.novell.com/patch/finder/?keywords=9b0aea51d7510d41288711e510f010df

  SUSE Linux Enterprise Desktop 11 SP1
    http://download.novell.com/patch/finder/?keywords=31d452e9bdc91325cef696c4c54131ba
    http://download.novell.com/patch/finder/?keywords=9b0aea51d7510d41288711e510f010df

  SUSE Linux Enterprise Server 11 SP1
    http://download.novell.com/patch/finder/?keywords=a4d065fb806f84b6cda40ea4a843aae7
    http://download.novell.com/patch/finder/?keywords=d4b5f25f4db8718301e7e16715b81839
    http://download.novell.com/patch/finder/?keywords=31d452e9bdc91325cef696c4c54131ba
    http://download.novell.com/patch/finder/?keywords=f2bc63a432cbfc30adf058c05528c5fd
    http://download.novell.com/patch/finder/?keywords=0b7e04a54fedaae34f6309faa0744773
    http://download.novell.com/patch/finder/?keywords=836acbf4bd9c116e2d6a3b8cc8e914ff
    http://download.novell.com/patch/finder/?keywords=9b0aea51d7510d41288711e510f010df

______________________________________________________________________________

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 <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.

   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.

 - 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+subscribe@opensuse.org>.

   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
               <opensuse-security-announce+subscribe@opensuse.org>.

   =====================================================================
   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>

- -----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.2 (GNU/Linux)
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=ypVs
- -----END PGP PUBLIC KEY BLOCK-----

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.18 (GNU/Linux)

iQEVAwUBTud+jHey5gA9JdPZAQLRfAf/ctOYIFKwo7VCtcygDS77IdMUsGWDIyBx
Tk2/sxFsVEMjhGELC71+maGKEWLIPtciRzhMWTPQoxWRbpEeP7S2j6U2SZnbzn0Y
s0WuvqnpO/z2pBYhaWvzBt3yTFOy+Qi79fvLoWGKrtsB3sfHKAlf1BIfn80tHq+0
TtWZo5pk0wOTWbUH/NyGESOvJOt9a7CVfb6Yimho5AcSNewbRa8LylCTjHtJwEvw
EJkmVahL/2LxuOJpR9kc7srErUyOuOREXovcetwmGMXMqk38Jy4KRGHhifeVPRrY
GviYVLBFxI6ckLcNJHo88T4+2gJY6ko0MjAX+i/UejPoE6ptSPD1KA==
=AGgP
-----END PGP SIGNATURE-----
Screenshot

Project Spotlight

Kigo Video Converter Ultimate for Mac

A tool for converting and editing videos.

Screenshot

Project Spotlight

Kid3

An efficient tagger for MP3, Ogg/Vorbis, and FLAC files.