[NT] RealPlayer 'ShowPreferences' Buffer Overflow Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 01/23/05

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Date: 23 Jan 2005 16:42:30 +0200

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      RealPlayer 'ShowPreferences' Buffer Overflow Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    A vulnerability has been discovered in the RealPlayer ActiveX component
    that allows remote code execution when visiting a specially crafted
    webpage or when opening a specially crafted skin file.

    DETAILS

    Vulnerable Systems:
     * RealPlayer version 10.5 (6.0.12.1040) and prior

    The RealPlayer ActiveX component exports a function called HandleAction().
    This function is designed to take a method or an action, and to execute it
    under a number of differing environments. This could be within a
    RealPlayer skin file or a webpage which is designed to interact with
    RealPlayer.

    One of the 'actions' which HandleAction() will accept is
    'ShowPreferences'. This method will accept two arguments, a category and
    the url of it's respective webpage.

    It has been discovered that passing overly long arguments to this method
    will result in an unbounded concatenation of the two arguments into a
    stack based buffer through an unchecked call to sprintf().

    Fix Information:
    RealNetworks have released an update for the ShowPreferences buffer
    overflow which can be downloaded from:
    <http://service.real.com/help/faq/security/040928_player/EN/>
    http://service.real.com/help/faq/security/040928_player/EN/

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nisr@nextgenss.com>
    NGSSoftware Insight Security Research.
    The original article can be found at:
    <http://www.ngssoftware.com/advisories/real-01full.txt>
    http://www.ngssoftware.com/advisories/real-01full.txt

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