ZDI-10-274: RealNetworks Realplayer RV20 Stream Parsing Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-274

December 10, 2010

-- CVE ID:
CVE-2010-4378

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

-- Affected Vendors:
RealNetworks

-- Affected Products:
RealNetworks RealPlayer

-- 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.

The specific flaw exists within the module responsible for decompressing
RV20 video streams. The drv2.dll trusts a value from the file as a
length and uses it within a copy loop that writes to heap memory. By
specifying large enough values, heap memory can be corrupted which can
lead to arbitrary code execution under the context of the user accessing
the media file.

-- 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:
2010-01-06 - Vulnerability reported to vendor
2010-12-10 - Coordinated public release of advisory

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

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