31 lines
No EOL
1.5 KiB
Markdown
31 lines
No EOL
1.5 KiB
Markdown
## What?
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This repo contains a Proof of Concept exploit for CVE-2017-8570, a.k.a the "Composite Moniker" vulnerability. This demonstrates using the Packager.dll trick to drop an sct file into the %TEMP% directory, and then execute it using the primitive that the vulnerability provides.
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Download: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/44263.zip
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## Why?
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A few reasons.
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1. I wanted to see if it was possible to use the [Packager.dll file-dropping trick](https://securingtomorrow.mcafee.com/mcafee-labs/dropping-files-temp-folder-raises-security-concerns/) to exploit this vulnerability.
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2. As far as I'm aware, all other public exploits for CVE-2017-8570 are actually exploiting the "Script Moniker" variant of CVE-2017-0199 and are not actually composite moniker exploits.
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3. Raise awareness of exploitation techniques used in the wild, and help defenders to detect exploitation attempts.
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## How to run
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Simply run the script, providing an Sct file to execute, and an output name for your RTF file:
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python packager_composite_moniker.py -s calc.sct -o example.rtf
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[+] RTF file written to: example.rtf
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## Detection
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I have included a Yara rule to detect attempts to exploit this vulnerability via RTF.
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## References
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- https://justhaifei1.blogspot.co.uk/2017/07/bypassing-microsofts-cve-2017-0199-patch.html
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- https://securingtomorrow.mcafee.com/mcafee-labs/dropping-files-temp-folder-raises-security-concerns/
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- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8570 |