WxMCTF '24 Pwn 5 - lain-writes-in-lisp

Have you read your SICP today?

HINT: After you get the leaks there's an almost arbitrarily long overflow on the heap in the "add_token" function. Use it to corrupt the heap's metadata.

Challenge Instance

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Files
  • lain_ZlR5EIV
    • SHA256 checksum: 6ef8c215c39979510946d75ab4164649e48553c7403ae369bf593643d9238347
  • lisp.c
    • SHA256 checksum: 6979fb936c737a6289aae73cfcc7b37d42bc53ddd405ffa5e69f8fe3b997c674
  • Dockerfile
    • SHA256 checksum: aa1df55629d06b907ff55cd613c92ebbc231517f640f9ca699db3a96b0a49fb0
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