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[SuSE] Schwachstellen im SuSE Linux Kernel - SUSE-SA:2008:053



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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgendes SuSE Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.

CVE-2008-3525 - Schwachstelle in der Funktion sbni_ioctl() des Linux
Kernels

  In der Funktion sbni_ioctl aus den WAN Subsystem des Linux Kernels
  wird nicht ueberprueft, ob der Aufrufer die Capability CAP_NET_ADMIN
  besitzt. Ein lokaler Angreifer kann dadurch die ioctl()-Anfragen
  SIOCDEVRESINSTATS, SIOCDEVSHWSTATE, SIOCDEVENSLAVE und
  SIOCDEVEMANSIPATE durchfuehren obwohl dies ohne die Capabilities nicht
  moeglich sein sollte.

CVE-2008-3526 - Integer Overflow in der Linux Kernelfunktion
sctp_setsockopt_auth_key()

  In der Funktion sctp_setsockopt_auth_key() aus dem Linux SCTP Treiber
  laesst sich ein Integer Overflow ausloesen. Ein Angreifer kann diese
  Schwachstelle dazu ausnutzen, eine Kernel Panic auszuloesen, indem er
  ein entsprechend aufgebautes SCTP Paket an das betroffene System
  sendet (Denial of Service).

CVE-2008-3528 - Denial of Service Schwachstelle in den EXT
Dateisystemtreibern

  Die Treiber fuer die EXT2, EXT3 und EXT4-Dateisysteme erzeugen zuviele
  Fehlermeldungen (printk), falls die Datenstrukturen des Dateisystems
  fehlerhaft sind. Dies fuehrt zu einem zeitweiligen Einfrieren des
  Systems. Angreifer koennen diese Schwachstelle zu einen Denial of
  Service Angriff ausnutzen, indem sie ein defektes EXT-Dateisystem
  mounten (i.d.R. kann dies nur root) und anschliessend Lese- bzw.
  Schreiboperationen auf dem Dateisystem ausfuehren.

CVE-2008-3792 - Schwachstelle im Linux SCTP Treiber

  Der Linux SCTP Treiber (net/sctp/socket.c) ueberprueft bei der
  Verarbeitung von SCTP-AUTH Headern nicht, ob die SCTP-AUTH Erweiterung
  des Kernels aktiviert ist. Dies fuehrt zum Aufruf verschiedener
  Funktionen aus dem SCTP Treiber, ohne dass diese vorhanden sind, was
  zu einer Kernel Panic fuehrt. Angreifer koennen diese Schwachstelle
  ueber das Netz zu einem Denial of Service Angriff ausnutzen.

CVE-2008-3911 - Schwachstelle in der Funktion proc_do_xprt()

  Die Funktion proc_do_xprt() in net/sunrpc/sysctl.c im Linux Kernel
  ueberprueft nicht die Laenge eines bestimmten uebergebenen Buffers
  wodurch ein Buffer Overflow ausgeloest werden kann. Ein lokaler
  Angreifer kann diese Schwachstelle ausnutzen, indem er in einer
  entsprechender Weise die /proc/sys/sunrpc/transports Datei ausliest.

CVE-2008-4113 - Schwachstelle in der Linux Kernelfunktion
sctp_getsockopt_hmac_ident()

  Die Linux Kernelfunktion sctp_getsockopt_hmac_ident() ueberprueft
  einen Laengenwert nicht, wenn Daten aus dem Kernel- in den Userspace
  kopiert werden. Dadurch koennen lokale Angreifer evtl. vertrauliche
  Informationen auslesen, indem sie einen entsprechend aufgebauten
  SCTP_HMAC_IDENT IOCTL Request ueber die sctp_getsockopt() Funktion
  absetzen. Die Schwachstelle kann nur ausgenutzt werden, wenn die
  SCTP-AUTH Extension aktiviert ist.

CVE-2008-4410 - Schwachstelle in der Funktion vmi_write_ldt_entry()

  In der Funktion vmi_write_ldt_entry() in arch/x86/kernel/vmi_32.c im
  Linux Kernel wird ein write_idt_entry anstatt eines write_ldt_entry
  ausgefuehrt. Ein lokaler Angreifer kann diese Schwachstelle ausnutzen
  um einen Denial of Service Angriff durchzufuehren, indem er z.B. Werte
  mit der Funktion sys_modify_ldt() in der Interruct Descriptor Tables
  (IDT) schreibt.

CVE-2008-4445 - Schwachstelle in der Linux Kernelfunktion
sctp_auth_ep_set_hmacs()

  Die Linux Kernelfunktion sctp_auth_ep_set_hmacs() ueberprueft nicht,
  ob der "identifier" Indexwert zwischen 0 und SCTP_AUTH_HMAC_ID_MAX
  liegt. Dadurch koennen Daten aus dem Kernel- in den Userspace kopiert
  werden, was lokalen Angreifern ermoeglicht, evtl. vertrauliche Daten
  auszulesen, indem sie einen entsprechend aufgebauten SCTP_HMAC_IDENT
  IOCTL Request ueber die sctp_getsockopt() Funktion absetzen. Die
  Schwachstelle kann nur ausgenutzt werden, wenn die SCTP-AUTH Extension
  aktiviert ist.

CVE-2008-4576 - Schwachstelle im Linux SCTP Treiber

  Empfaengt der Linux SCTP Treiber INIT-ACK Pakete die angeben, das die
  Gegenstelle keine Authentifizierungsmechanismen (AUTH) unterstuetzt,
  so werden durch die sctp_process_init() Funktion auch bereits aktive
  SCTP-Verbindungen geloescht. Dies loest wiederum beim Timeout des
  T1-Init Timers einen Kernel OOPS aus. Angreifer koennen diese
  Schwachstelle ueber das Netz zu einem Denial of Service Angriff
  ausnutzen.

CVE-2008-4618 - Schwachstelle in Stream Control Transmission Protocol
(sctp)

  In der Implementierung von Stream Control Transmission Protocol (sctp)
  im Linux Kernel werden in den Funktionen sctp_sf_violation_paramlen(),
  sctp_sf_abort_violation() und sctp_make_abort_violation() die
  uebergeben Datentypen nicht ausreichend ueberprueft. Dies kann ein
  Angreifer ausnutzen, um eine Kernel Panic auszuloesen (Denial of
  Service).

Betroffen sind die folgenden Software Pakete und Plattformen:

  Paket kernel

  openSUSE 11.0

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

Hersteller Advisory:
  http://www.novell.com/linux/security/securitysupport.html


(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
		Klaus Moeller, DFN-CERT


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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                kernel
        Announcement ID:        SUSE-SA:2008:053
        Date:                   Mon, 27 Oct 2008 18:00:00 +0000
        Affected Products:      openSUSE 11.0
        Vulnerability Type:     remote denial of service
        Severity (1-10):        7
        SUSE Default Package:   yes
        Cross-References:       CVE-2008-3525, CVE-2008-3526, CVE-2008-3528
                                CVE-2008-3792, CVE-2008-3911, CVE-2008-4113
                                CVE-2008-4410, CVE-2008-4445, CVE-2008-4576
                                CVE-2008-4618

    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 patch updates the openSUSE 11.0 kernel to the 2.6.25.18 stable
   release.

   It also includes bugfixes and security fixes:

   CVE-2008-4410: The vmi_write_ldt_entry function in
   arch/x86/kernel/vmi_32.c in the Virtual Machine Interface (VMI) in the
   Linux kernel 2.6.26.5 invokes write_idt_entry where write_ldt_entry
   was intended, which allows local users to cause a denial of service
   (persistent application failure) via crafted function calls, related
   to the Java Runtime Environment (JRE) experiencing improper LDT
   selector state.

   CVE-2008-4618: Fixed a kernel panic in SCTP while process protocol
   violation parameter.

   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-2008-3526: Integer overflow in the sctp_setsockopt_auth_key
   function in net/sctp/socket.c in the Stream Control Transmission
   Protocol (sctp) implementation in the Linux kernel allows remote
   attackers to cause a denial of service (panic) or possibly have
   unspecified other impact via a crafted sca_keylength field associated
   with the SCTP_AUTH_KEY option.

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

   CVE-2008-4576: SCTP in Linux kernel before 2.6.25.18 allows remote
   attackers to cause a denial of service (OOPS) via an INIT-ACK
   that states the peer does not support AUTH, which causes the
   sctp_process_init function to clean up active transports and triggers
   the OOPS when the T1-Init timer expires.

   CVE-2008-4445: The sctp_auth_ep_set_hmacs function in net/sctp/auth.c
   in the Stream Control Transmission Protocol (sctp) implementation
   in the Linux kernel before 2.6.26.4, when the SCTP-AUTH extension
   is enabled, does not verify that the identifier index is within the
   bounds established by SCTP_AUTH_HMAC_ID_MAX, which allows local users
   to obtain sensitive information via a crafted SCTP_HMAC_IDENT IOCTL
   request involving the sctp_getsockopt function.

   CVE-2008-3792: net/sctp/socket.c in the Stream Control Transmission
   Protocol (sctp) implementation in the Linux kernel 2.6.26.3 does not
   verify that the SCTP-AUTH extension is enabled before proceeding
   with SCTP-AUTH API functions, which allows attackers to cause
   a denial of service (panic) via vectors that result in calls to
   (1) sctp_setsockopt_auth_chunk, (2) sctp_setsockopt_hmac_ident,
   (3) sctp_setsockopt_auth_key, (4) sctp_setsockopt_active_key,
   (5) sctp_setsockopt_del_key, (6) sctp_getsockopt_maxburst, (7)
   sctp_getsockopt_active_key, (8) sctp_getsockopt_peer_auth_chunks, or
   (9) sctp_getsockopt_local_auth_chunks.

   CVE-2008-4113: The sctp_getsockopt_hmac_ident function in
   net/sctp/socket.c in the Stream Control Transmission Protocol (sctp)
   implementation in the Linux kernel before 2.6.26.4, when the SCTP-AUTH
   extension is enabled, relies on an untrusted length value to limit
   copying of data from kernel memory, which allows local users to
   obtain sensitive information via a crafted SCTP_HMAC_IDENT IOCTL
   request involving the sctp_getsockopt function.

   CVE-2008-3911: The proc_do_xprt function in net/sunrpc/sysctl.c in
   the Linux kernel 2.6.26.3 does not check the length of a certain
   buffer obtained from user space, which allows local users to overflow
   a stack-based buffer and have unspecified other impact via a crafted
   read system call for the /proc/sys/sunrpc/transports file.

2) Solution or Work-Around

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

3) Special Instructions and Notes

   Please reboot your machine after installing the kernel.

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/pub/opensuse/update/11.0/rpm/i586/kernel-debug-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-default-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-pae-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-rt-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-rt_debug-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-source-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-syms-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-vanilla-2.6.25.18-0.2.i586.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/kernel-xen-2.6.25.18-0.2.i586.rpm

   Platform Independent:

   openSUSE 11.0:
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/noarch/kernel-docs-2.6.25.18-0.2.noarch.rpm

   Power PC Platform:

   openSUSE 11.0:
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/ppc/kernel-default-2.6.25.18-0.2.ppc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/ppc/kernel-kdump-2.6.25.18-0.2.ppc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/ppc/kernel-ppc64-2.6.25.18-0.2.ppc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/ppc/kernel-ps3-2.6.25.18-0.2.ppc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/ppc/kernel-source-2.6.25.18-0.2.ppc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/ppc/kernel-syms-2.6.25.18-0.2.ppc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/ppc/kernel-vanilla-2.6.25.18-0.2.ppc.rpm

   x86-64 Platform:

   openSUSE 11.0:
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-debug-2.6.25.18-0.2.x86_64.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-default-2.6.25.18-0.2.x86_64.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-rt-2.6.25.18-0.2.x86_64.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-rt_debug-2.6.25.18-0.2.x86_64.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-source-2.6.25.18-0.2.x86_64.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-syms-2.6.25.18-0.2.x86_64.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-vanilla-2.6.25.18-0.2.x86_64.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/kernel-xen-2.6.25.18-0.2.x86_64.rpm

   Sources:

   openSUSE 11.0:
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-debug-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-default-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-docs-2.6.25.18-0.2.src.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-kdump-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-pae-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-ppc64-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-ps3-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-rt-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-rt_debug-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-source-2.6.25.18-0.2.src.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-syms-2.6.25.18-0.2.src.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-vanilla-2.6.25.18-0.2.nosrc.rpm
   http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/kernel-xen-2.6.25.18-0.2.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@xxxxxxx>"

    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@xxxxxxx 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@xxxxxxxxxxxx
        -   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@xxxxxxxxxxxx>.

    opensuse-security-announce@xxxxxxxxxxxx
        -   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@xxxxxxxxxxxx>.

    =====================================================================
    SUSE's security contact is <security@xxxxxxxx> or <security@xxxxxxx>.
    The <security@xxxxxxx> 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@xxxxxxx>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@xxxxxxx>

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- -- 
Dipl. Inform. Klaus Moeller (Incident Response Team)
Phone: +49 40 808077-555, Fax: +49 40 808077-556

DFN-CERT Services GmbH, https://www.dfn-cert.de,  Phone  +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805,  Ust-IdNr.:  DE 232129737
Sachsenstrase 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski

Automatische Warnmeldungen   https://www.cert.dfn.de/autowarn
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