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CVE-2018-4121 — Proof-of-concept remote code execution exploit targeting Safari 11.0.3 on macOS 10.13.3 via a WebAssembly section vulnerability (CVE-2018-4121). Includes heap spray and dylib payload integration. | Kitploit
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GitHubjezzus/cve-2018-4121

CVE-2018-4121

Proof-of-concept remote code execution exploit targeting Safari 11.0.3 on macOS 10.13.3 via a WebAssembly section vulnerability (CVE-2018-4121). Includes heap spray and dylib payload integration.

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28 years agoNot yet reviewed

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CVE-2018-4121 - Safari Wasm Sections POC RCE Exploit

by MWR Labs (c) 2018

Details

  • this proof of concept exploit targets Safari 11.0.3 (13604.5.6) on macOS 10.13.3 (17D47) versions only.
  • compile the payload of your choice as a dylib with a constructor
  • run python file_to_jsarray.py your.dylib payload.js
  • serve this directory and point Safari to /exploit.html
  • exploit is not fully reliable and uses hardcoded offsets for this macOS/Safari version.
  • exploit takes a while to run due to the size of the heap spray (24.5GB).
  • this issue is addressed in macOS 10.13.4 as CVE-2018-4121 (https://support.apple.com/en-gb/HT208692)

Credits

  • Natalie Silvanovich of Google Project Zero - https://bugs.chromium.org/p/project-zero/issues/detail?id=1522
  • Ian Beer of Google Project Zero - https://googleprojectzero.blogspot.co.uk/2014/07/pwn4fun-spring-2014-safari-part-i_24.html
  • Phoenhex - https://phoenhex.re/
  • Fermin Serna - https://media.blackhat.com/bh-us-12/Briefings/Serna/BH_US_12_Serna_Leak_Era_Slides.pdf

References

  • https://labs.mwrinfosecurity.com/assets/BlogFiles/apple-safari-wasm-section-vuln-write-up-2018-04-16.pdf
  • https://labs.mwrinfosecurity.com/mwr-vulnerability-disclosure-policy
  • https://www.mwrinfosecurity.com/about-us/
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