2021no writeups on CTFtime
iCTF 2021
23 challenges with 25 published solutions between them. CTFtime lists this event but has no writeups filed against it, so it is absent from the index CTFtime feeds. These were found in public repositories instead. Each link is pinned to the commit it was read from.
The event on CTFtimeUncategorised12
The upstream scoreboard did not say, so neither do we.
README light
3 official solutionsAesnoc
1 official solutionAsk Over The Air
1 official solutionbreakRAID
1 official solutionDango
1 official solutionFlagservice
1 official solutionNearest
1 official solutionPartition01
1 official solutionPartition02
1 official solutionSweet Curve
1 official solution
Binary exploitation6
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
Solve it with:ROP gadget finderShellcode assembler and libraryCyclic pattern generator and offset finderFormat string exploit builderLearn: Binary exploitation
Baby Heap
1 official solutionGot Rewriter
1 official solutionRop Machine Returns
1 official solutionTarinai
1 official solution
Reverse engineering3
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
Solve it with:Strings extractor for binaries and blobsWebAssembly disassemblerJava .class disassemblerPython .pyc bytecode disassemblerLearn: Binary exploitation
Emoemotet
1 official solutionLtrace
1 official solution
Web2
Reach data or functionality the application meant to keep from you - through its inputs, its tokens, or its trust in the client.
Solve it with:JWT decoder and signature verifierJWT alg=none bypass generatorWeb attack payload catalogJWT secret brute forceLearn: Web attacks and session tokens
Sourcemap
1 official solutionTraversal
1 official solution