Articles / SuSE: New kernel packages f…

SuSE: New kernel packages fix remote code execution

This kernel update for openSUSE 11.0 fixes several security problems, including a buffer overflow in the Stream Control Transmission Protocol (sctp) implementation allows remote attackers to remotely execute code. The nfs_permission function in the NFS client implementation allows local users to bypass permissions and execute files. The audit_syscall_entry functionallows local users to bypass certain syscall audit configurations via crafted syscalls. nfsd did not drop the CAP_MKNOD capability before handling a user request in a thread, which allows local users to create device nodes. The seccomp subsystem allows local users to bypass intended access restrictions via crafted syscalls that are misinterpreted as (a) stat or (b) chmod. A buffer overflow in CIFS allows remote attackers to cause a denial of service (crash) or potential code execution. The exit_notify function did not restrict exit signals when the CAP_KILL capability is held, which allows local users to send an arbitrary signal to a process. The shm subsystem misinterprets the data type of an inode, which allows local users to cause a denial of service (system hang). The VMX implementation in the KVM subsystem allows guest OS users to cause a denial of service (OOPS). Updated packages are available from download.opensuse.org.

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

______________________________________________________________________________

                       SUSE Security Announcement

       Package:                kernel
       Announcement ID:        SUSE-SA:2009:031
       Date:                   Mon, 09 Jun 2009 09:00:00 +0000
       Affected Products:      openSUSE 11.0
       Vulnerability Type:     remote code execution
       Severity (1-10):        9
       SUSE Default Package:   yes
       Cross-References:       CVE-2009-0028, CVE-2009-0065, CVE-2009-0269
                               CVE-2009-0322, CVE-2009-0675, CVE-2009-0676
                               CVE-2009-0834, CVE-2009-0835, CVE-2009-0859
                               CVE-2009-1072, CVE-2009-1242, CVE-2009-1265
                               CVE-2009-1337, CVE-2009-1439, CVE-2009-1630
                               CVE-2009-1961

   Content of This Advisory:
       1) Security Vulnerability Resolved:
            Linux kernel security problem
          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 openSUSE 11.0 fixes some bugs and several
  security problems.

  The following security issues are fixed:
  CVE-2009-0065: Buffer overflow in net/sctp/sm_statefuns.c in the
  Stream Control Transmission Protocol (sctp) implementation in the
  Linux kernel allows remote attackers to remotely execute code via an
  FWD-TSN (aka FORWARD-TSN) chunk with a large stream ID.

  CVE-2009-1961: A local denial of service problem in the splice(2)
  system call.

  CVE-2009-1630: The nfs_permission function in fs/nfs/dir.c in the
  NFS client implementation in the Linux kernel when atomic_open is
  available, does not check execute (aka EXEC or MAY_EXEC) permission
  bits, which allows local users to bypass permissions and execute files,
  as demonstrated by files on an NFSv4 file server.

  CVE-2009-0834: The audit_syscall_entry function in the Linux kernel
  on the x86_64 platform did not properly handle (1) a 32-bit process
  making a 64-bit syscall or (2) a 64-bit process making a 32-bit
  syscall, which allows local users to bypass certain syscall audit
  configurations via crafted syscalls.

  CVE-2009-1072: nfsd in the Linux kernel did not drop the CAP_MKNOD
  capability before handling a user request in a thread, which allows
  local users to create device nodes, as demonstrated on a filesystem
  that has been exported with the root_squash option.

  CVE-2009-0835  The __secure_computing function in kernel/seccomp.c
  in the seccomp subsystem in the Linux kernel on the x86_64 platform,
  when CONFIG_SECCOMP is enabled, does not properly handle (1) a 32-bit
  process making a 64-bit syscall or (2) a 64-bit process making a
  32-bit syscall, which allows local users to bypass intended access
  restrictions via crafted syscalls that are misinterpreted as (a)
  stat or (b) chmod.

  CVE-2009-1439: Buffer overflow in fs/cifs/connect.c in CIFS in the
  Linux kernel 2.6.29 and earlier allows remote attackers to cause
  a denial of service (crash) or potential code execution via a long
  nativeFileSystem field in a Tree Connect response to an SMB mount
  request.

  This requires that kernel can be made to mount a "cifs" filesystem
  from a malicious CIFS server.

  CVE-2009-1337: The exit_notify function in kernel/exit.c in the Linux
  kernel did not restrict exit signals when the CAP_KILL capability
  is held, which allows local users to send an arbitrary signal to a
  process by running a program that modifies the exit_signal field and
  then uses an exec system call to launch a setuid application.

  CVE-2009-0859: The shm_get_stat function in ipc/shm.c in the shm
  subsystem in the Linux kernel, when CONFIG_SHMEM is disabled,
  misinterprets the data type of an inode, which allows local users
  to cause a denial of service (system hang) via an SHM_INFO shmctl
  call, as demonstrated by running the ipcs program. (SUSE is enabling
  CONFIG_SHMEM, so is by default not affected, the fix is just for
  completeness).

  CVE-2009-1242: The vmx_set_msr function in arch/x86/kvm/vmx.c in
  the VMX implementation in the KVM subsystem in the Linux kernel on
  the i386 platform allows guest OS users to cause a denial of service
  (OOPS) by setting the EFER_LME (aka "Long mode enable") bit in the
  Extended Feature Enable Register (EFER) model-specific register,
  which is specific to the x86_64 platform.

  CVE-2009-1265: Integer overflow in rose_sendmsg (sys/net/af_rose.c) in
  the Linux kernel might allow attackers to obtain sensitive information
  via a large length value, which causes "garbage" memory to be sent.

  CVE-2009-0028: The clone system call in the Linux kernel allows
  local users to send arbitrary signals to a parent process from an
  unprivileged child process by launching an additional child process
  with the CLONE_PARENT flag, and then letting this new process exit.

  CVE-2009-0675: The skfp_ioctl function in drivers/net/skfp/skfddi.c
  in the Linux kernel permits SKFP_CLR_STATS requests only when the
  CAP_NET_ADMIN capability is absent, instead of when this capability
  is present, which allows local users to reset the driver statistics,
  related to an "inverted logic" issue.

  CVE-2009-0676: The sock_getsockopt function in net/core/sock.c in
  the Linux kernel does not initialize a certain structure member,
  which allows local users to obtain potentially sensitive information
  from kernel memory via an SO_BSDCOMPAT getsockopt request.

  CVE-2009-0322: drivers/firmware/dell_rbu.c in the Linux kernel allows
  local users to cause a denial of service (system crash) via a read
  system call that specifies zero bytes from the (1) image_type or (2)
  packet_size file in /sys/devices/platform/dell_rbu/.

  CVE-2009-0269: fs/ecryptfs/inode.c in the eCryptfs subsystem in the
  Linux kernel allows local users to cause a denial of service (fault
  or memory corruption), or possibly have unspecified other impact,
  via a readlink call that results in an error, leading to use of a -1
  return value as an array index.

  Some other non-security bugs were fixed, please see the RPM changelog.

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 (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:

  openSUSE 11.0:
  http://download.opensuse.org/update/11.0/rpm/i586/kernel-debug-2.6.25.20-0.4.i586.rpm
  http://download.opensuse.org/update/11.0/rpm/i586/kernel-default-2.6.25.20-0.4.i586.rpm
  http://download.opensuse.org/update/11.0/rpm/i586/kernel-pae-2.6.25.20-0.4.i586.rpm
  http://download.opensuse.org/update/11.0/rpm/i586/kernel-source-2.6.25.20-0.4.i586.rpm
  http://download.opensuse.org/update/11.0/rpm/i586/kernel-syms-2.6.25.20-0.4.i586.rpm
  http://download.opensuse.org/update/11.0/rpm/i586/kernel-vanilla-2.6.25.20-0.4.i586.rpm
  http://download.opensuse.org/update/11.0/rpm/i586/kernel-xen-2.6.25.20-0.4.i586.rpm

  Platform Independent:

  openSUSE 11.0:
  http://download.opensuse.org/update/11.0/rpm/noarch/kernel-docs-2.6.25.20-0.4.noarch.rpm

  Power PC Platform:

  openSUSE 11.0:
  http://download.opensuse.org/update/11.0/rpm/ppc/kernel-default-2.6.25.20-0.4.ppc.rpm
  http://download.opensuse.org/update/11.0/rpm/ppc/kernel-kdump-2.6.25.20-0.4.ppc.rpm
  http://download.opensuse.org/update/11.0/rpm/ppc/kernel-ppc64-2.6.25.20-0.4.ppc.rpm
  http://download.opensuse.org/update/11.0/rpm/ppc/kernel-ps3-2.6.25.20-0.4.ppc.rpm
  http://download.opensuse.org/update/11.0/rpm/ppc/kernel-source-2.6.25.20-0.4.ppc.rpm
  http://download.opensuse.org/update/11.0/rpm/ppc/kernel-syms-2.6.25.20-0.4.ppc.rpm
  http://download.opensuse.org/update/11.0/rpm/ppc/kernel-vanilla-2.6.25.20-0.4.ppc.rpm

  x86-64 Platform:

  openSUSE 11.0:
  http://download.opensuse.org/update/11.0/rpm/x86_64/kernel-debug-2.6.25.20-0.4.x86_64.rpm
  http://download.opensuse.org/update/11.0/rpm/x86_64/kernel-default-2.6.25.20-0.4.x86_64.rpm
  http://download.opensuse.org/update/11.0/rpm/x86_64/kernel-source-2.6.25.20-0.4.x86_64.rpm
  http://download.opensuse.org/update/11.0/rpm/x86_64/kernel-syms-2.6.25.20-0.4.x86_64.rpm
  http://download.opensuse.org/update/11.0/rpm/x86_64/kernel-vanilla-2.6.25.20-0.4.x86_64.rpm
  http://download.opensuse.org/update/11.0/rpm/x86_64/kernel-xen-2.6.25.20-0.4.x86_64.rpm

  Sources:

  openSUSE 11.0:
  http://download.opensuse.org/update/11.0/rpm/src/kernel-debug-2.6.25.20-0.4.nosrc.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-default-2.6.25.20-0.4.nosrc.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-docs-2.6.25.20-0.4.src.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-kdump-2.6.25.20-0.4.nosrc.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-pae-2.6.25.20-0.4.nosrc.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-ppc64-2.6.25.20-0.4.nosrc.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-ps3-2.6.25.20-0.4.nosrc.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-source-2.6.25.20-0.4.src.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-syms-2.6.25.20-0.4.src.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-vanilla-2.6.25.20-0.4.nosrc.rpm
  http://download.opensuse.org/update/11.0/rpm/src/kernel-xen-2.6.25.20-0.4.nosrc.rpm

______________________________________________________________________________

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.

   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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