Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

  Realplayer vidplin.dll AVI Parsing Remote Code Execution Vulnerability
                              28 January 2011


        AusCERT Security Bulletin Summary

Product:           Realplayer
Publisher:         Zero Day Initiative
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2010-4393  

Original Bulletin: 

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

Realplayer vidplin.dll AVI Parsing Remote Code Execution Vulnerability
ZDI-11-033: January 27th, 2011



CVSS Score

      9, (AV:N/AC:L/Au:N/C:P/I:P/A:C) 

Affected Vendors


Affected Products


TippingPoint IPS Customer Protection
TippingPoint IPS customers are protected against this vulnerability by Digital 
Vaccine protection filter ID 10640. For further product information on the 
TippingPoint IPS:


Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on 
vulnerable installations of Realnetworks Realplayer SP. User interaction is 
required to exploit this vulnerability in that the target must visit a 
malicious page or open a malicious file.

The specific flaw exists within the vidplin.dll module. A buffer is allocated 
according to the user supplied length value. User supplied data is then copied 
into the allocated buffer, without verifying length, allowing the data to be 
written past the bounds of the previously allocated buffer. A remote attacker 
can exploit this vulnerability to execute arbitrary code under the context of 
the user running RealPlayer.

Vendor Response
RealNetworks has issued an update to correct this vulnerability. More details 
can be found at:


Disclosure Timeline

      2010-09-14 - Vulnerability reported to vendor
      2011-01-27 - Coordinated public release of advisory

This vulnerability was discovered by:

      Juan Pablo Lopez Yacubian

- --------------------------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:


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