blog of keltecc

I write about CTF and hacking.

posts

2025-03-17 Insomni'hack 2025 - revengery
// forge ECDSA signature to takeower the ownership of a Solidity contract
2024-11-26 CTFZone 2024 Final — registry
// exploiting layer naming in Docker container registry
2024-09-13 BRICS+ CTF 2024 — villa & mirage & excess
// writeup for all web challenges from BRICS+ CTF
2024-09-12 BRICS+ CTF 2024 — dolly
// reverse engineering of some tricky binary
2024-09-05 BRICS+ CTF 2024 — gollum
// pwning the Golang application with a compiler bug
2024-06-21 CVE-2024-5629 writeup
// out-of-bounds read in Python binary package
2024-03-04 CVE-2024-21502 writeup
// memory corruption in Python binary package
2024-02-10 Gold CTF 2024 — digger
// reversing crypto binary to achieve slide attack primitive
2023-04-26 RuCTF Finals 2023 — stalker
// exploiting race condition in MariaDB primary keys setup
2023-04-25 RuCTF Finals 2023 — solaris
// attacking matrix-based cryptosystem using Coppersmith method
2022-12-11 Russian CTF Cup 2022 — babyrsa
// collect impossible remainders and use CRT to retrieve RSA factor
2022-09-08 FAUST CTF 2022 — Notes from the Future
// predicting random output to forge proof of knowledge scheme
2022-07-31 Aero CTF 2022 — balloon
// memory corruption in CPython exploiting madvise()
2022-05-22 RuCTF 2022 — ambulance
// exploiting arbitrary free in CPython library to gain RCE
2022-02-06 STAY ~/ 2022 — virush
// write a ROP chain on the stack of /usr/bin/dd using the of=/proc/self/mem
2021-06-14 Leto CTF 2021 — confident-confinement
// escape a python jail with decorators and type annotations
2021-05-15 m0leCon CTF 2021 Teaser — Obscurity
// attacking FCSR state to recover keystream
2021-05-15 m0leCon CTF 2021 Teaser — Giant log
// calculate discrete log using p-adics
2021-05-15 m0leCon CTF 2021 Teaser — Alternating key exchange
// using meet-in-the-middle approach to attack non-commutative scheme
2020-12-26 RuCTF 2020 — notary
// detect the low-entropy PRNG and attack the KMOV cryptosystem
2020-11-30 Russian CTF Cup 2020 — security
// provide a native engine to openssl using an injection to command arguments
2020-11-19 Russian CTF Cup 2020 — caller
// abuse single system call primitive to gain RCE in CPython
2020-09-09 CONFidence CTF 2020 Finals — ElGamal
// mapping to the additive group using invalid curve attack
2020-07-28 CyBRICS CTF 2020 — Incident
// exploiting buffer overflow to leak a hidden backdoor
2020-07-20 FAUST CTF 2020 — Cartography
// arbitrary write using malloc() primitive
2020-05-24 m0leCon CTF 2020 Teaser — King Exchange
// recovering group structure of a circle to calculate discrete log
all posts...

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