DownUnderCTF 2023 Challenges + Solutions

beginner

Challenge	Author	Category	Release Round
xxd-server	hashkitten	web	round_1
one byte	joseph	pwn	round_1
flag art	joseph	crypto	round_1
randomly chosen	joseph	crypto	round_1
helpless	hashkitten	misc	round_1
downunderflow	joseph	pwn	round_1
discord	Crem	misc	round_1
𝕏	a_metre	misc	round_1
complementary	joseph	crypto	round_1
blinkybill	Anon	misc	round_1
pyny	hashkitten	rev	round_1
All Father's Wisdom	pix	rev	round_1
the bridgekeepers 3rd question	hashkitten	rev	round_1
proxed	Jordan Bertasso	web	round_1
Welcome to DUCTF!	pix	misc	round_1
Needle In IAM	BootlegSorcery@	misc	round_1
static file server	joseph	web	round_1
confusing	joseph	pwn	round_1

blockchain

Challenge	Author	Difficulty	Release Round
Eight Five Four Five	Blue Alder	beginner	round_1
Another Please	BlueAlder	easy	round_1
Monkeing Around	Blue Alder	medium	round_1
Immutable	Blue Alder	hard	round_1

crypto

Challenge	Author	Difficulty	Release Round
apbq rsa i	joseph	easy	round_1
apbq rsa ii	joseph	medium	round_1
hhhhh	hashkitten	medium	round_1
fnv	hashkitten, joseph	medium	round_2
handshake	joseph	medium	round_1
dilithium±	joseph	hard	round_1
encrypted mail	joseph	hard	round_1
lcg card gimmicks	joseph	hard	round_2

misc

Challenge	Author	Difficulty	Release Round
impossible	ghostccamm	easy	round_1
My First C Program!	pix	easy	round_1
Smart Calculator	Solopie	easy	round_1
SimpleFTPServer	BootlegSorcery@	easy	round_2
Rogueful Helper	Conletz	medium	round_2
mini dns server	joseph, pix	medium	round_1
real baby ruby	hashkitten	medium	round_2
baby ruby	hashkitten	medium	round_1
daas	hashkitten	hard	round_1
Survey	DUCTF_TEAM	none	round_3

osint

Challenge	Author	Difficulty	Release Round
Bridget's Back!	Anon	beginner	round_1
Excellent Vista!	Anon	beginner	round_1
monke bars	ghostccamm	easy	round_1
Comeacroppa	Nosurf	easy	round_2
faraday	hashkitten	medium	round_1
Shipwrecked	Nosurf	hard	round_1

pwn

Challenge	Author	Difficulty	Release Round
safe calculator	grub	easy	round_1
the great escape	sradley	easy	round_1
roppenheimer	sradley	medium	round_2
binary mail	joseph	medium	round_2
shifty mem	joseph	medium	round_1
vroom vroom	sradley	hard	round_1
baby crm	grub	hard	round_1
return to monke	sradley	hard	round_1

rev

Challenge	Author	Difficulty	Release Round
masked squares flag checker	joseph	easy	round_1
number theoretic flag checker	joseph	medium	round_2
sideways	joseph	medium	round_1
wrong signal	hashkitten	medium	round_2
SPACEGAME	hashkitten	medium	round_1
advanced vector expositions	joseph	hard	round_1

web

Challenge	Author	Difficulty	Release Round
cgi fridays	hashkitten	easy	round_1
strapi in	ghostccamm	easy	round_2
grades_grades_grades	donfran	easy	round_2
actually-proxed	Jordan Bertasso	easy	round_1
secure blog	ghostccamm	medium	round_2
smooth jazz	hashkitten	medium	round_1
0day blog	ghostccamm	hard	round_1
crossed monkes	ghostccamm	hard	round_1