ZDI-10-275: RealNetworks RealPlayer Cross-Zone Scripting Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-275

December 10, 2010

-- CVE ID:
CVE-2010-4396

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

-- 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 10589.
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 RealNetworks RealPlayer. User interaction is
requires in that a target must navigate to a malicious page.

The specific flaw exists within the HandleAction method of the
RealPlayer ActiveX control with CLSID
FDC7A535-4070-4B92-A0EA-D9994BCC0DC5. The vulnerable action that can be
invoked via this control is NavigateToURL. If NavigateToURL can be
pointed to a controlled file on the user's system, RealPlayer can be
made to execute scripts in the Local Zone. To accomplish this, a
malicious attacker can force a download of a skin file to a predictable
location and then point NavigateToURL at it thus achieving remote code
execution 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:

http://service.real.com/realplayer/security/12102010_player/en/

-- Disclosure Timeline:
2010-05-12 - Vulnerability reported to vendor
2010-12-10 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Anonymous

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