AusCERT - ESB-2011.0844 - [SUSE] kernel: Multiple vulnerabilities

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ESB-2011.0844 - [SUSE] kernel: Multiple vulnerabilities
Date: 15 August 2011
References: ESB-2011.0487 ESB-2011.0536 ESB-2011.0537 ESB-2011.0559 ESB-2011.0959

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0844
        SUSE Security Announcement: Linux kernel (SUSE-SA:2011:034)
                              15 August 2011

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:          kernel
Publisher:        SUSE
Operating System: SUSE
Impact/Access:    Denial of Service    -- Remote/Unauthenticated
                  Increased Privileges -- Existing Account      
Resolution:       Patch/Upgrade
CVE Names:        CVE-2011-2496 CVE-2011-2491 CVE-2011-2484
                  CVE-2011-2182 CVE-2011-2022 CVE-2011-1746
                  CVE-2011-1745 CVE-2011-1593 CVE-2011-1585
                  CVE-2011-1495 CVE-2011-1494 CVE-2011-1093
                  CVE-2011-1017 CVE-2011-0726 

Reference:        ESB-2011.0559
                  ESB-2011.0537
                  ESB-2011.0536
                  ESB-2011.0487

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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                kernel
        Announcement ID:        SUSE-SA:2011:034
        Date:                   Fri, 12 Aug 2011 13:00:00 +0000
        Affected Products:      SUSE Linux Enterprise Desktop 10 SP4
                                SLE SDK 10 SP4
                                SUSE Linux Enterprise Server 10 SP4
        Vulnerability Type:     remote denial of service, potential local privilege escalation
        CVSS v2 Base Score:     7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
        SUSE Default Package:   yes
        Cross-References:       CVE-2011-0726, CVE-2011-1017, CVE-2011-1093
                                CVE-2011-1494, CVE-2011-1495, CVE-2011-1585
                                CVE-2011-1593, CVE-2011-1745, CVE-2011-1746
                                CVE-2011-2022, CVE-2011-2182, CVE-2011-2484
                                CVE-2011-2491, CVE-2011-2496

    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

   This kernel update for the SUSE Linux Enterprise 10 SP4 kernel fixes
   several security issues and bugs.

   Following security issues were fixed:
   CVE-2011-1093: The dccp_rcv_state_process function in net/dccp/input.c
   in the Datagram Congestion Control Protocol (DCCP) implementation
   in the Linux kernel did not properly handle packets for a CLOSED
   endpoint, which allowed remote attackers to cause a denial of service
   (NULL pointer dereference and OOPS) by sending a DCCP-Close packet
   followed by a DCCP-Reset packet.

   CVE-2011-2484: The add_del_listener function in kernel/taskstats.c
   in the Linux kernel did not prevent multiple registrations of exit
   handlers, which allowed local users to cause a denial of service
   (memory and CPU consumption), and bypass the OOM Killer, via a
   crafted application.

   CVE-2011-1745: Integer overflow in the agp_generic_insert_memory
   function in drivers/char/agp/generic.c in the Linux kernel allowed
   local users to gain privileges or cause a denial of service (system
   crash) via a crafted AGPIOC_BIND agp_ioctl ioctl call.

   CVE-2011-1746: Multiple integer overflows in the (1)
   agp_allocate_memory and (2) agp_create_user_memory functions in
   drivers/char/agp/generic.c in the Linux kernel allowed local users to
   trigger buffer overflows, and consequently cause a denial of service
   (system crash) or possibly have unspecified other impact, via vectors
   related to calls that specify a large number of memory pages.

   CVE-2011-2022: The agp_generic_remove_memory function in
   drivers/char/agp/generic.c in the Linux kernel before 2.6.38.5 did
   not validate a certain start parameter, which allowed local users
   to gain privileges or cause a denial of service (system crash) via a
   crafted AGPIOC_UNBIND agp_ioctl ioctl call, a different vulnerability
   than CVE-2011-1745.

   CVE-2011-1585: When using a setuid root mount.cifs, local users could
   hijack password protected mounted CIFS shares of other local users.

   CVE-2011-0726: The do_task_stat function in fs/proc/array.c in the
   Linux kernel did not perform an expected uid check, which made it
   easier for local users to defeat the ASLR protection mechanism by
   reading the start_code and end_code fields in the /proc/#####/stat
   file for a process executing a PIE binary.

   CVE-2011-2496: The normal mmap paths all avoid creating a mapping
   where the pgoff inside the mapping could wrap around due to
   overflow. However, an expanding mremap() can take such a non-wrapping
   mapping and make it bigger and cause a wrapping condition.

   CVE-2011-2491: A local unprivileged user able to access a NFS
   filesystem could use file locking to deadlock parts of an nfs server
   under some circumstance.

   CVE-2011-1017,CVE-2011-2182: The code for evaluating LDM partitions
   (in fs/partitions/ldm.c) contained bugs that could crash the kernel
   for certain corrupted LDM partitions.

   CVE-2011-1593: Multiple integer overflows in the next_pidmap function
   in kernel/pid.c in the Linux kernel allowed local users to cause a
   denial of service (system crash) via a crafted (1) getdents or (2)
   readdir system call.

   CVE-2011-1494: Integer overflow in the _ctl_do_mpt_command function
   in drivers/scsi/mpt2sas/mpt2sas_ctl.c in the Linux kernel might have
   allowed local users to gain privileges or cause a denial of service
   (memory corruption) via an ioctl call specifying a crafted value that
   triggers a heap-based buffer overflow.

   CVE-2011-1495: drivers/scsi/mpt2sas/mpt2sas_ctl.c in the Linux kernel
   did not validate (1) length and (2) offset values before performing
   memory copy operations, which might have allowed local users to gain
   privileges, cause a denial of service (memory corruption), or obtain
   sensitive information from kernel memory via a crafted ioctl call,
   related to the _ctl_do_mpt_command and _ctl_diag_read_buffer functions.

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 Desktop 10 SP4 for x86
     http://download.novell.com/patch/finder/?keywords=75c70ba80807aed777189444e17910e5

   SUSE Linux Enterprise Desktop 10 SP4
     http://download.novell.com/patch/finder/?keywords=2284bd78d78b00accc68729a9634d92d
     http://download.novell.com/patch/finder/?keywords=75c70ba80807aed777189444e17910e5

   SLE SDK 10 SP4
     http://download.novell.com/patch/finder/?keywords=2284bd78d78b00accc68729a9634d92d
     http://download.novell.com/patch/finder/?keywords=0e9208ee65c884d152a545b8766938bc
     http://download.novell.com/patch/finder/?keywords=3b9cb9db7d375a34d07fb460aad8137b
     http://download.novell.com/patch/finder/?keywords=75c70ba80807aed777189444e17910e5

   SUSE Linux Enterprise Server 10 SP4
     http://download.novell.com/patch/finder/?keywords=2284bd78d78b00accc68729a9634d92d
     http://download.novell.com/patch/finder/?keywords=5f3e206eac108e161bdd1b3928ce7c3e
     http://download.novell.com/patch/finder/?keywords=0e9208ee65c884d152a545b8766938bc
     http://download.novell.com/patch/finder/?keywords=3b9cb9db7d375a34d07fb460aad8137b
     http://download.novell.com/patch/finder/?keywords=75c70ba80807aed777189444e17910e5

   SUSE Linux Enterprise Desktop 10 SP4 for AMD64 and Intel EM64T
     http://download.novell.com/patch/finder/?keywords=2284bd78d78b00accc68729a9634d92d

______________________________________________________________________________

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>

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