ZDI-10-276: RealNetworks RealPlayer Upsell.htm getqsval Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-276

December 10, 2010

-- CVE ID:
CVE-2010-4388

-- 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
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 Upsell.htm component of the
RealPlayer default installation. Due to a failure to properly sanitize
user-supplied input, it is possible for an attacker to inject arbitrary
code into the RealOneActiveXObject process via the getqsval function.
This can be abused to bypass the Local Machine Zone security policy and
load unsafe controls. Successful exploitation of this issue leads to
remote code execution under the context of the RealPlayer application.

-- 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:
2010-06-30 - Vulnerability reported to vendor
2010-12-10 - Coordinated public release of advisory

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

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