Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

          New Linux kernel privilege escalation - heads up notice
                              5 November 2009


        AusCERT Security Bulletin Summary

Product:          kernel
Publisher:        SUSE
Operating System: SUSE
Impact/Access:    Root Compromise -- Existing Account
Resolution:       Mitigation
CVE Names:        CVE-2009-3547  

Reference:        ESB-2009.1467

Comment: SUSE have stated that there are no workarounds for this 
         vulnerability on specific versions of their OS. Until patches are
         released administrators may wish to consider installing Logwatch
         to look for suspicious activity. If an attacker is able to exploit
         the vulnerability and obtain root privileges, they would of course
         be able to turn off or modify these logs.

- --------------------------BEGIN INCLUDED TEXT--------------------


A bug in the Linux kernels "pipe" system call implementation was found which
can be used by local attackers to gain root privileges.


This problem affects all our currently maintained Linux products.

- - SUSE Linux Enterprise Server 9 / Open Enterprise Server 1

  Are affected. Updates are being prepared and will be released next week.
  There is unfortunately no workaround possible.

- - SUSE Linux Enterprise Server / Desktop 10 SP2,
  Open Enterprise Server 2 SP1

  Are affected. Updates are being QA'ed and will be released begin of
  next week.
  There is unfortunately no workaround possible.

- - SUSE Linux Enterprise Server / Desktop 10 SP3

  Are affected. Updates are being QA'ed and will be released begin of
  next week.

  A workaround is possible by enabling the MMAP null page exploitprotection
  by enabling the "mmap_min_addr" protection in this kernel, by doing (as r=
  	echo -n 65536 > /proc/sys/vm/mmap_min_addr

  To keep this persistent over the next boot, you can also add it to=20
  	vm.mmap_min_addr =3D 65536

  (We did not enable this by default to avoid breaking legacy software.)

- - SUSE Linux Enterprise Server / Desktop 11
  openSUSE 11.0
  openSUSE 11.1

  Are affected by this problem, but the exploit can not be used to execute =
  just to cause a crash / "Oops".

  The kernel is using the MMAP null page exploit protection by default and =
  the exploit is not effective (will just lead to a Ooops).

  You can verify the protection to be enabled by doing:
  	cat /proc/sys/vm/mmap_min_addr

  A value larger than 0 means "enabled".

  Updates that fix this issue will be published, but not in the same hurry =
as for
  the older product lines.

The several days delay in getting Kernel updates out is due to kernel
QA taking around 4 days, as they include numbers of regressions, burn-in
and partner tests and careful evaluation of the generated results.

Ciao, Marcus

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
Comment: http://www.auscert.org.au/render.html?it=1967