[HP] Schwachstellen in Bind 9.2 (OpenSSL) (rev 4) - HPSBUX0310-290

win-sec-ssc at dfn-cert.de win-sec-ssc at dfn-cert.de
Wed Oct 27 17:59:06 CEST 2004


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Liebe Kolleginnen und Kollegen,

soeben erreichte uns das nachfolgende Bulletin der HP SupportLine. Wir
geben diese Informationen unveraendert an Sie weiter.

Mit der 4. Revision des Advisories HPSBUX0310-290 stellt HP Patches
fuer HP-UX B.11.23 zur Verfuegung.

Zur Erinnerung:

OpenSSL ist ein Open Source Toolkit, das unter anderem Secure Sockets
Layer (SSL v2/v3) und Transport Layer Security (TLS v1)
Implementierungen fuer Webserver und andere Produkte zur Verfuegung
stellt.

CAN-2003-0545 - Fehler im ASN.1 Parser

  Werden bestimmte ASN.1 Datenstrukturen (ASN1_TYPE) beim Parsen als
  ungueltig erkannt, wird ein Teil des Speichers der Datenstruktur
  wieder freigegeben, was zu Fehlern im Stack-Handling der aufrufenden
  Anwendung fuehrt. Dadurch koennen Angreifer evtl. beliebigen Code mit
  den Privilegien der Anwendung ausfuehren, welche die Datenstruktur
  parst.

CAN-2003-0543 - Fehler im ASN.1 Parser

  Die Auswertung bestimmter Werte von ASN.1 Tags kann dazu fuehren, das
  Speicherbereiche ausgelesen werden, die nicht zur ASN.1 Datenstruktur
  gehoeren. Als Folge davon kann es zum Absturz des Programms kommen,
  was von einem Angreifer zu einem Denial-of-Service Angriff ausgenutzt
  werden kann.

CAN-2003-0544 - Fehler im ASN.1 Parser

  Die Auswertung bestimmter Werte von ASN.1 Tags kann dazu fuehren, das
  Speicherbereiche ausgelesen werden, die nicht zur ASN.1 Datenstruktur
  gehoeren. Als Folge davon kann es zum Absturz des Programms kommen,
  was von einem Angreifer zu einem Denial-of-Service Angriff ausgenutzt
  werden kann.

  Weiterhin:

  Ein ungueltiger Public Key in einem Client-Zertifikat kann zum Absturz
  des Programms fuehren, falls Auswertungsfehler (speziell
  X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY) ignoriert werden. Dies
  ist normalerweise nur beim Debugging von OpenSSL der Fall. Angreifer
  koennen dies zu einem Denial-of-Service Angriff ausnutzen, indem sie
  ein entsprechend formuliertes Zertifikat an den Server schicken.

  Der OpenSSL Code prueft immer ein angebotenes Zertifikat, auch wenn
  die aufrufende Anwendung gar kein Zertifikat verlangt hat. Diese
  Schwachstelle wird dadurch besonders gefaehrlich, weil sie damit auch
  in den Faellen ausgenutzt werden koennen, wenn die Anforderung von
  Client-Zertifikaten auf Servern deaktiviert wurde.


Betroffen sind die folgenden Software Pakete und Plattformen:

  BINDv920

  HP9000 Servers mit HP-UX B.11.00, B.11.11, B.11.22, und B.11.23 mit
  installiertem BINDv920.

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

(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,


           Jan Kohlrausch, DFN-CERT

- --
Jan Kohlrausch (CSIRT), DFN-CERT Services GmbH
Web: https://www.dfn-cert.de/, Phone: +49-40-808077-555
PGP RSA/2048, A5DD03D1, A2 55 1C 51 0A 30 3E 78  5B 40 DA B7 14 F7 C9 E8



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Hash: SHA1

 ----------------------------------------------------------------
 **REVISED 04**
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0310-290
 Originally issued: 08 October 2003
 Last revised: 25 October 2004
 SSRT3622 rev.4  HP-UX Bind v920 Denial of Service (DoS)
 -----------------------------------------------------------------

NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.

The information in the following Security Bulletin should be
acted upon as soon as possible.  Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.

 -----------------------------------------------------------------
PROBLEM: 1. Certain ASN.1 encodings that are rejected as invalid
            by the parser can trigger a bug in the deallocation
            of the corresponding data structure, corrupting the
            stack.  This can be used as a denial of service
            attack.  It is currently unknown whether this can be
            exploited to run malicious code. This issue does not
            affect OpenSSL 0.9.6.

            More details are available at:
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0545

         2. Unusual ASN.1 tag values can cause an out of bounds
            read under certain circumstances, resulting in a
            denial of service vulnerability.
            More details are available at:
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0543
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0544

         3. A malformed public key in a certificate will crash
            the verify code if it is set to ignore public key
            decoding errors.  Exploitation of an affected
            application would result in a denial of service
            vulnerability.

         4. Due to an error in the SSL/TLS protocol handling,
            a server will parse a client certificate when one is
            not specifically requested.

IMPACT:   Potential Denial of Service

PLATFORM: HP9000 Servers running HP-UX releases B.11.00, B.11.11,
          B.11.22, and B.11.23, only with the BINDv920 installed.

**REVISED 04**
SOLUTION: Until a product upgrade is available, download and
          install the appropriate depot from the ftp site
          (see below).

      Bind9.2 for B.11.00         BINDv920 version 003
      Bind9.2 for B.11.11         BINDv920 version 005
      Bind9.2 patch for B.11.22   PHNE_29859.depot
 -->  Bind9.2 patch for B.11.23   PHNE_31726 or subsequent

**REVISED 04**
MANUAL ACTIONS: Yes - NonUpdate
                for B.11.00 download web upgrade
                for B.11.11 download web upgrade
                for B.11.22 use the temporary depot
 -->            for B.11.23 no manual actions required
                Install the product containing the fix.

AVAILABILITY: The depots or patch are available now, via ftp
              (see below).
              This bulletin will be updated when a product
              upgrade is available.

CHANGE SUMMARY:  Rev.01 added web upgrade for B.11.11
                 Rev.02 added B.11.23 depot
                 Rev.03 added B.11.11 web upgrade
                 Rev.04 added patch from B.11.23
 -----------------------------------------------------------------
**REVISED 04**
 A. Background
    An SSL/TLS testing suite developed by the NISCC (National
    Infrastructure Security Co-Ordination Centre in the UK) has
    identified ASN.1 parsing vulnerabilities in OpenSSL.


     AFFECTED VERSIONS

     The following is a list by HP-UX revision of
     affected filesets or patches and fix information.
     To determine if a system has an affected version,
     search the output of "swlist -a revision -l fileset"
     for an affected fileset or patch, then determine if
     a fixed revision or applicable patch is installed.

     HP-UX B.11.00
     =============
     BINDv920.INETSVCS-BIND
     action: install revision B.11.00.01.003 or subsequent

     HP-UX B.11.11
     =============
     BINDv920.INETSVCS-BIND
     action: install revision B.11.11.01.005 or subsequent

     HP-UX B.11.22
     =============
     InternetSrvcs.INETSVCS2-RUN
     action: install PHNE_29859.depot

     HP-UX B.11.23
     =============
     InternetSrvcs.INETSVCS2-RUN
 --> action: install PHNE_31726 or subsequent

     END AFFECTED VERSIONS


**REVISED 04**
 B. Recommended solution
    Note: These fixes should be applied to all systems using
    DNS, including those systems with client programs only.

 -->For B.11.23, install PHNE_31726 or subsequent.

 -->Note: It is not necessary to remove the temporary patch,
 -->      PHNE_30465, before installing PHNE_31726.

 -->      Although both PHNE_30465 and PHNE_31726 resolve the
 -->      vulnerability, PHNE_31726 is recommended, even if
 -->      PHNE_30465 is installed.  PHNE_31726 is a general
 -->      release patch and PHNE_30465 is a temporary patch.

    Notes on Bind Versions (B.11.00 and B.11.11)
    =============================================

    Bind is available on B.11.00 and B.11.11 as part of
    the base operating system and as a web upgrade.
    Both versions (base os and web upgrade) may be
    installed on a system simultaneously.  Only one
    version can be active.  The active version can
    be changed via a script.

    The base os versions are updated via patches.  The
    web upgrade versions are updated by installing a
    later web upgrade.  The web upgrade versions are
    not patched, instead are simply newer versions.

    If a web upgrade version is active it is not possible
    to patch the base os version.  It is necessary to
    switch to the base os version with the following
    command before applying the patch:

     /usr/bin/enable_inet -r bind

    If you are running a web upgrade version and do not
    intend to re-enable the base os version, it is not
    necessary to patch the base os version.  However,
    since the base os version can be re-enabled with
    the script, you may want to patch the base os version
    even though it is not active.  Similarly, if you have
    installed a web upgrade version and have switched
    back to the base os version, you may want to update
    to the latest web upgrade version or use swremove(1)
    to remove the web upgrade version entirely.

    Identifying the Active Version (B.11.00/B.11.11)
    ================================================

    Execute the following command:

     what /usr/sbin/named | grep named

    The bind version will be on the named line.
    For example:

     named 9.2.0 Thu Jul 18 11:58:39 GMT 2002


    Identifying the Web Upgrade Version (B.11.00/B.11.11)
    =====================================================

    If the file /usr/contrib/bind/usr/sbin/named exists,
    execute the following:

     what /usr/contrib/bind/usr/sbin/named | grep named

    The bind version will be on the named line.
    If the version is anything other than 9.2.0, this bulletin
    does not apply to the system being examined.

    Until a product upgrade is available, download and install
    install the appropriate depot from the ftp site.

 -->1a). For B.11.22, download PHNE_29859.depot.gz from
 -->     the following ftp site:

        System:    hprc.external.hp.com  (192.170.19.51)
        Login:     bind920
        Password:  bind920

        FTP Access: ftp://bind920:bind920@hprc.external.hp.com/
                or: ftp://bind920:bind920@192.170.19.51/
                or: ftp hprc.external.hp.com

        Note: There is an ftp defect in IE5 that may result in
               a browser hang.  To work around this:
        - Select Tools -> Internet Options -> Advanced
        - Un-check the option:
                  [ ] Enable folder view for FTP sites

      1b). For B.11.11 download BINDv920 version 005 from web
           upgrade at: <http://software.hp.com>

      1c). For B.11.00 download BINDv920 version 003 from web
           upgrade at: <http://software.hp.com>

     ==================================================
 -->  2. For B.11.22, copy PHNE_29859.depot.gz to a
         protected directory and unpack it.

     cksum:
           1640049049 12927378  PHNE_29859.depot.gz

     md5:
         PHNE_29859.depot.gz
               0B306B5E4353D157F0120B719D8D38D3

 -->  3. For B.11.22, install PHNE_29859.depot using swinstall(1).


* The software product category that this Security Bulletin
  relates to is represented by the 5th and 6th characters of the
  Bulletin number: GN=General, MA=Management Agents,
  MI=Misc. 3rd party, MP=HP-MPE/iX, NS=HP NonStop Servers,
  OV=HP OpenVMS, PI=HP Printing & Imaging, ST=HP Storage,
  TU=HP Tru64 UNIX, TL=Trusted Linux, UX=HP-UX, VV=Virtual Vault


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Or via anonymous ftp:
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