Ispravljeni propusti jezgre operacijskog sustava

U radu jezgre operacijskih sustava SUSE Linux Enterprise 10 SP4 uočeno je više sigurnosnih propusta. Udaljeni napadač je navedene propuste mogao iskoristiti za DoS (eng. Denial of Service) napad te otkrivanje osjetljivih informacija.
Paket:	Linux kernel 2.6.x
Operacijski sustavi:	SUSE Linux Enterprise Desktop 10, SUSE Linux Enterprise Server (SLES) 10
Kritičnost:	5.4
Problem:	cjelobrojno prepisivanje, pogreška u programskoj funkciji, pogreška u programskoj komponenti, preljev međuspremnika
Iskorištavanje:	udaljeno
Posljedica:	otkrivanje osjetljivih informacija, uskraćivanje usluga (DoS)
Rješenje:	programska zakrpa proizvođača
CVE:	CVE-2009-4067, CVE-2011-1577, CVE-2011-1776, CVE-2011-3191, CVE-2011-3363
Izvorni ID preporuke:	SUSE-SA:2011:042
Izvor:	SUSE

Problem:
Problemi sigurnosti su posljedica preljeva međuspremnika u komponenti "USB driver", pogrešaka u programskoj funkciji "is_gpt_valid", cjelobrojnog prepisivanja u komponenti "CIFS", itd.
Posljedica:
Udaljeni napadač navedene ranjivosti može iskoristiti za rušenje ranjivog sustava te pregled osjetljivih podataka.
Rješenje:
Rješenje problema sigurnosti je korištenje dostupnih programskih nadogradnji i zakrpa.
Izvorni tekst preporuke
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                kernel
        Announcement ID:        SUSE-SA:2011:042
        Date:                   Fri, 28 Oct 2011 14:00:00 +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
        CVSS v2 Base Score:     5.6 (AV:N/AC:H/Au:S/C:N/I:P/A:C)
        SUSE Default Package:   yes
        Cross-References:       CVE-2009-4067, CVE-2011-1577, CVE-2011-1776
                                CVE-2011-3191, CVE-2011-3363

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             Linux kernel security issues
           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 Linux kernel update fixes various security issues and bugs in
   the SUSE Linux Enterprise 10 SP4 kernel.

   Following security issues were fixed:
   CVE-2009-4067: A USB string descriptor overflow in the auerwald
   USB driver was fixed, which could be used by physically proximate
   attackers to cause a kernel crash.

   CVE-2011-3363: Always check the path in CIFS mounts to avoid
   interesting filesystem path interaction issues and potential crashes.

   CVE-2011-3191: A malicious CIFS server could cause a integer overflow
   on the local machine on directory index operations, in turn causing
   memory corruption.

   CVE-2011-1776: The is_gpt_valid function in fs/partitions/efi.c in
   the Linux kernel did not check the size of an Extensible Firmware
   Interface (EFI) GUID Partition Table (GPT) entry, which allowed
   physically proximate attackers to cause a denial of service (heap-based
   buffer overflow and OOPS) or obtain sensitive information from kernel
   heap memory by connecting a crafted GPT storage device, a different
   vulnerability than CVE-2011-1577.

   Following non-security issues were fixed:
   - md: fix deadlock in md/raid1 and md/raid10 when handling a read error
     (bnc#628343).
   - md: fix possible raid1/raid10 deadlock on read error during resync
     (bnc#628343).
   - Add timeo parameter to /proc/mounts for nfs filesystems (bnc#616256).

   - virtio: indirect ring entries (VIRTIO_RING_F_INDIRECT_DESC) (bnc#713876).
   - virtio: teach virtio_has_feature() about transport features (bnc#713876).

   - nf_nat: do not add NAT extension for confirmed conntracks (bnc#709213).

   - 8250: Oxford Semiconductor Devices (bnc#717126).
   - 8250_pci: Add support for the Digi/IBM PCIe 2-port Adapter (bnc#717126).
   - 8250: Fix capabilities when changing the port type (bnc#717126).
   - 8250: Add EEH support (bnc#717126).

   - xfs: fix memory reclaim recursion deadlock on locked inode buffer
     (bnc#699355 bnc#699354 bnc#721830).

   - ipmi: do not grab locks in run-to-completion mode (bnc#717421).

   - cifs: add fallback in is_path_accessible for old servers (bnc#718028).

   - cciss: do not attempt to read from a write-only register (bnc#683101).

   - s390: kernel: System hang if hangcheck timer expires (bnc#712009,
     LTC#74157).
   - s390: kernel: NSS creation with initrd fails (bnc#712009,LTC#74207).
   - s390: kernel: remove code to handle topology interrupts (bnc#712009,
     LTC#74440).

   - xen: Added 1083-kbdfront-absolute-coordinates.patch (bnc#717585).

   - acpi: Use a spinlock instead of mutex to guard gbl_lock access
     (bnc#707439).

   - Allow balance_dirty_pages to help other filesystems (bnc#709369).
   - nfs: fix congestion control (bnc#709369).
   - NFS: Separate metadata and page cache revalidation mechanisms
     (bnc#709369).

   - jbd: Fix oops in journal_remove_journal_head() (bnc#694315).

   - xen/blkfront: avoid NULL de-reference in CDROM ioctl handling
     (bnc#701355).
   - xen/x86: replace order-based range checking of M2P table by
     linear one.
   - xen/x86: use dynamically adjusted upper bound for contiguous regions
     (bnc#635880).

   - Fix type in
patches.fixes/libiscsi-dont-run-scsi-eh-if-iscsi-task-is-making-progress.

   - s390: cio: Add timeouts for internal IO (bnc#701550,LTC#72691).
   - s390: kernel: first time swap use results in heavy swapping
     (bnc#701550, LTC#73132).
   - s390: qeth: wrong number of output queues for HiperSockets
     (bnc#701550, LTC#73814).

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=6253a90635c740c154fb5e3cc64612f2

   SUSE Linux Enterprise Desktop 10 SP4
    
http://download.novell.com/patch/finder/?keywords=be6b41cc85222e68513448b61b7af786
    
http://download.novell.com/patch/finder/?keywords=6253a90635c740c154fb5e3cc64612f2

   SLE SDK 10 SP4
    
http://download.novell.com/patch/finder/?keywords=be6b41cc85222e68513448b61b7af786
    
http://download.novell.com/patch/finder/?keywords=c4377326fa8f6c8c833ef411e531a291
    
http://download.novell.com/patch/finder/?keywords=169bd714365eb7c38e38540921171d06
    
http://download.novell.com/patch/finder/?keywords=6253a90635c740c154fb5e3cc64612f2

   SUSE Linux Enterprise Server 10 SP4
    
http://download.novell.com/patch/finder/?keywords=be6b41cc85222e68513448b61b7af786
    
http://download.novell.com/patch/finder/?keywords=b1201574824e860419470a1e97bdba2c
    
http://download.novell.com/patch/finder/?keywords=c4377326fa8f6c8c833ef411e531a291
    
http://download.novell.com/patch/finder/?keywords=169bd714365eb7c38e38540921171d06
    
http://download.novell.com/patch/finder/?keywords=6253a90635c740c154fb5e3cc64612f2

   SUSE Linux Enterprise Desktop 10 SP4 for AMD64 and Intel EM64T
    
http://download.novell.com/patch/finder/?keywords=be6b41cc85222e68513448b61b7af786

______________________________________________________________________________

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 <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>"

    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 Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite. 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:

    Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.
        -   General Linux and SUSE security discussion.
            All SUSE security announcements are sent to this list.
            To subscribe, send an e-mail to
                <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>.

    Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.
        -   SUSE's announce-only mailing list.
            Only SUSE's security announcements are sent to this list.
            To subscribe, send an e-mail to
                <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>.

    =====================================================================
    SUSE's security contact is <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> or <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>.
    The <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> 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 <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>

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