hxp CTF 2020

2020

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kernel-rop

by sisu
pwn

Difficulty estimate: medium - medium

Points: round(1000 · min(1, 10 / (9 + [6 solves]))) = 667 points

Description:

Security is difficult, and defenses should be always taken with a grain of salt.

Who would win? A buffer overflow or The Hottest Linux Defenses?

Flag is in /dev/sda.

Note: Increased time limits around 2020-12-20 01:00 UTC due to popular request. Nothing else changed.


Download:

kernel-rop-bf9c106d45917343.tar.xz (8.2 MiB)

Connection (mirrors):

  • nc 116.203.146.245 27499

Solution:


CTFtime Logo CTFtime: Task & Writeups

Solved by:

# Team Time
kernel-rop released 2020-12-19 20:16:13 +0000 UTC
🥇 The Flat Network Society 2020-12-20 04:09:00 +0000 UTC
🥈 Spatenbräu 2020-12-20 08:52:12 +0000 UTC
🥉 Katzebin 2020-12-20 09:00:24 +0000 UTC
4 Balsn 2020-12-20 11:36:59 +0000 UTC
5 r00timentary 2020-12-20 14:13:06 +0000 UTC
6 perfect guesser 2020-12-20 14:50:20 +0000 UTC