bugtraq - ZDI-10-010: RealNetworks RealPlayer Skin Parsing Remote Code Execution Vulnerability

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Message-ID: <EE499D69B3D0714590B6FE9762B046110388145609@emb01.unity.local>
Date: Thu, 21 Jan 2010 11:03:27 -0600
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>,
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-10-010: RealNetworks RealPlayer Skin Parsing Remote Code
 Execution Vulnerability

ZDI-10-010: RealNetworks RealPlayer Skin Parsing Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-010
January 21, 2010

-- CVE ID:
CVE-2009-4246

-- 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 8493. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute code on vulnerable
installations of RealNetworks RealPlayer. User interaction is required
in that a user must visit a malicious website or open a malicious file
and accept a dialog to switch player skins.

The specific flaw exists during parsing of malformed RealPlayer .RJS
skin files. While loading a skin the application copies certain variable
length fields from the extracted file named web.xmb into a statically
sized buffer. By crafting these fields appropriately an attack can cause
the process to overflow the buffer. This can be leveraged to execute
arbitrary code with the privileges of the application.

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

http://service.real.com/realplayer/security/01192010_player/en/

-- Disclosure Timeline:
2009-01-15 - Vulnerability reported to vendor
2010-01-21 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Peter Vreugdenhil (security@...ervreugdenhil.nl)

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents 
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/