[NT] Multiple Vulnerabilities in RealArcade (Integer Overflow, Files Deletion)

From: SecuriTeam (support_at_securiteam.com)
Date: 02/22/05

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Date: 22 Feb 2005 15:10:18 +0200

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      Multiple Vulnerabilities in RealArcade (Integer Overflow, Files Deletion)
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.realarcade.com/> RealArcade is a software/portal developed by
    RealNetworks for downloading and buying arcade games.

    RealArcade contains two security vulnerabilities, one is an integer
    overflow and the other is a file deletion vulnerabilit.

    DETAILS

    Vulnerable Systems:
     * RealArcade version 1.2.0.994 and prior

    Integer Overflow
    The vulnerability lies in the handling of RGS files. Each RGS file is
    defined using an integer of a 32 bits that specifies the length of a GUID
    string and a name of a game to install.

    When the user launches a RGS file he can choose if to continue installing
    or not.
    The vulnerability allows to overwrite the return address of the vulnerable
    function which in turn can be used by an attacker to execute malicious
    code.

    Arbitrary File Deletion
    The mechanism of the RGP files allows an attacker to also delete any file
    on the victim's disk by simply using the content of RGP file containing a
    tag followed by a filename with a directory traversal path.

    Example:
    ..
     <GAMEID>950258D1-7ABD-4afc-8886-449B98CE8224</GAMEID>
     <VERSION>1.0 Demo RGI</VERSION>
     <TYPE>demo</TYPE>
     <GENRE>Puzzle and Board</GENRE>

     <!-- now we exploit the directory traversal bug -->

     <FILENAME>../../windows/calc.exe</FILENAME>
    ..

    The problem is caused by the fact that RealArcade will truncate the file
    (if it is present) to a 0 bytes size before it tries to write to it.

    It appears that older versions could have been exploited using backslashes
    while recent versions can be only exploited using forward slashes.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:aluigi@autistici.org> Luigi
    Auriemma.

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