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[SGI] Lokale Schwachstelle im Linux Kernel 2.4.X - 20031201-01-A



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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgende Warnung des SGI Security
Coordinators ueber Sicherheitsprobleme im Linux Kernel. Wir geben
diese Informationen unveraendert an Sie weiter.

Wir gaben bereits ein Advisory zu dem Thema weiter. Zur Erinnerung:

  CAN-2003-0961:

  Der Systemaufruf brk() wird zur Bearbeitung der Groesse des Heap
  Bereichs eines Prozesses verwendet. In der Implementierung der
  Funktion im Linux Kernel der Version 2.4 kann ein Integer Overflow
  ausgeloest werden. Ein Prozess im Userspace kann durch Ausnutzung des
  Fehlers Zugriff auf den Speicher des Kernels erlangen.

  Ein lokaler Angreifer ist damit in der Lage root-Rechte zu erlangen,
  bzw. die absolute Kontrolle ueber die betroffene Maschine zu erreichen.
  Dies ist auch der Fall, wenn durch zusaetzliche Mechanismen die
  Rechte von root begrenzt wurden.

  Betroffen ist der Linux Kernel 2.4 bis einschliesslich 2.4.22. Das
  Problem wurde im Kernel 2.4.23 und in 2.6.0-test6 behoben. Bitte
  beachten Sie, dass bereits Programme zur Ausnutzung der
  Schwachstelle existieren und eingesetzt werden.

SGI bestaetigt das Vorhandensein der Schwachstelle in Altix Systemen
und stellt mit dem 'SGI ProPack v2.3 fuer Altix Systeme' Patches zur
Vefuegung.

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

Mit freundlichen Gruessen,
   Andreas Bunten, DFN-CERT
- -- 
Andreas Bunten         |                       mailto:bunten@xxxxxxxxxxx
DFN-CERT GmbH          |             http://www.cert.dfn.de/team/bunten/
Heidenkampsweg 41      |                        Phone: +49(40)808077-555
D-20097 Hamburg        |                          FAX: +49(40)808077-556
Germany                |          PGP-Key: finger bunten@xxxxxxxxxxxxxxx
PGP-Key fingerprint  =  25 E9 A6 DD 15 6C 09 70  9D 05 10 2B C7 AB C2 31


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______________________________________________________________________________
                           SGI Security Advisory

  Title     : do_brk() vulnerability on SGI Altix systems
  Number    : 20031201-01-A
  Date      : December 2, 2003
  Reference : Red Hat Advisory RHSA-2003:389-07, CAN-2003-0961, SGI BUG 901346
  Fixed in  : SGI ProPack v2.3
______________________________________________________________________________

SGI provides this information freely to the SGI user community for its
consideration, interpretation, implementation and use.  SGI recommends that
this information be acted upon as soon as possible.

SGI provides the information in this Security Advisory on an "AS-IS" basis
only, and disclaims all warranties with respect thereto, express, implied
or otherwise, including, without limitation, any warranty of merchantability
or fitness for a particular purpose.  In no event shall SGI be liable for
any loss of profits, loss of business, loss of data or for any indirect,
special, exemplary, incidental or consequential damages of any kind arising
from your use of, failure to use or improper use of any of the instructions
or information in this Security Advisory.
______________________________________________________________________________

SGI acknowledges the do_brk() vulnerability reported by Redhat:
http://rhn.redhat.com/errata/RHSA-2003-389.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0961
and has found that SGI ProPack v2.3 for the Altix family of
systems is not vulnerable.

If you have not received the SGI ProPack v2.3 CDs, contact
your SGI Support Provider or visit URL: http://support.sgi.com/


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SGI Security Advisories can be found at:
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Red Hat Errata: Security Alerts, Bugfixes, and Enhancements
http://www.redhat.com/apps/support/errata/

SGI Advanced Linux Environment security updates can found on:
ftp://oss.sgi.com/projects/sgi_propack/download/

SGI patches can be found at the following patch servers:
http://support.sgi.com/

The primary SGI anonymous FTP site for security advisories and
security patches is ftp://patches.sgi.com/support/free/security/


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security-info@xxxxxxxx

                      ------oOo------

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The primary SGI anonymous FTP site for security advisories and patches is
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For issues with the patches on the FTP sites, email can be sent to
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For assistance obtaining or working with security patches, please
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                      ------oOo------

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                      ------oOo------

SGI provides a comprehensive customer World Wide Web site. This site is
located at http://www.sgi.com/support/security/ .

                      ------oOo------

If there are general security questions on SGI systems, email can be sent to
security-info@xxxxxxxx

For reporting *NEW* SGI security issues, email can be sent to
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contract is not required for submitting a security report.

______________________________________________________________________________
      This information is provided freely to all interested parties
      and may be redistributed provided that it is not altered in any
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