Date: Mon, 28 Nov 2011 12:15:06 -0600
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: ZDI-11-331 : RealNetwork RealPlayer MPG Width Integer Underflow Remote
 Code Execution Vulnerability

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ZDI-11-331 : RealNetwork RealPlayer MPG Width Integer Underflow Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-331
November 28, 2011

- -- CVE ID:
CVE-2011-4259

- -- CVSS:
7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

- -- Affected Vendors:

RealNetworks



- -- Affected Products:

RealNetworks RealPlayer



- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11474.
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

- -- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Realplayer.  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 way RealPlayer handles MPEG files.
Realplayer parses the mpg file by doing a do while loop where it uses
the width of the movie for the loop condition. However, it will
substracts 1 from the width for every iteration of the loop and then
compare it to 0. If the width of the movie was zero at the beginning the
loop will run 0xFFFFFFFF times. This results in a memory corruption that
can lead to remote code execution under the context of the current user.

- -- Vendor Response:

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

http://service.real.com/realplayer/security/11182011_player/en/



- -- Disclosure Timeline:
2011-08-22 - Vulnerability reported to vendor
2011-11-28 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Luigi Auriemma



- -- About the Zero Day Initiative (ZDI):
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