$ cat writeup.md…
$ cat writeup.md…
bug-makers
Task: YAML quiz app requires score of 1337 but max quiz score is 7; server parses YAML with both v1.1 and v1.2 and requires different results. Solution: exploit YAML 1.1 octal interpretation — submit 02471 (octal for 1337) which parses as 1337 in v1.1 but 2471 in v1.2, bypassing the difference check.
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