Challenges

320 challenges are currently available

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Sandboxes Status

Challenges
SysAdmin Part 1 sandbox is Up	Secure Mail sandbox is Up
Looking for god in your life? sandbox is Up	XSS Challenge 1 sandbox is Up
Captcha I sandbox is Up	Propaganda mail sandbox is Up
Basics of Linux x64 shellcoding sandbox is Up	Level1 Pwnage Linux Level Up sandbox is Up
Level1 Pwnage Linux x86_64 sandbox is Up	Virtual World sandbox is Down
Hot Single Mom sandbox is Up	Bash Jail 1 sandbox is Up

Coding Challenges (17)

Challenges descriptions	Points	Validation	Author
Hash me please	2	2500	Mr.Un1k0d3r
Ask your grandpa!	2	938	Mr.Un1k0d3r's Dad
Hash me reloaded	3	1401	Mr.Un1k0d3r
I hate mathematics	3	1499	Mr.Un1k0d3r
Ask your grandpa again!	4	306	Mr.Un1k0d3r's Dad
Hash breaker	4	1142	Mr.Un1k0d3r
I saw a little elf	4	409	Mr.Un1k0d3r
Hash breaker reloaded	5	669	Mr.Un1k0d3r
Execute me if you can	5	346	Mr.Un1k0d3r
Read me if you can	6	359	Mr.Un1k0d3r
Hash breaker reloaded again	6	227	Mr.Un1k0d3r
Ascii Art	6	537	Mr.Un1k0d3r
Execute me if you can again	6	173	Mr.Un1k0d3r
Xor me if you can	6	343	Mr.Un1k0d3r
Number game	7	256	Mr.Un1k0d3r remade by theindian
Classic Sudoku	7	216	Mr.Un1k0d3r remade by dread_knight
Find the right word	7	272	Mr.Un1k0d3r

Cryptography (32)

Challenges descriptions	Points	Validation	Author
Some martian message	1	5226	Mr.Un1k0d3r
You're Drunk!	1	1104	Mr.Un1k0d3r
File recovery	1	2486	Mr.Un1k0d3r
Public key recovery	2	1223	Mr.Un1k0d3r
Fashion Victim	2	400	GoSec CTF 2014
Martian message part 2	2	2268	Mr.Un1k0d3r
Can you understand this sentence?	3	563	Mr.Un1k0d3r
Let's Play Scrabble!	3	25	Madness
I Lost my password	3	954	Mr.Un1k0d3r
Martian message part 3	3	851	Mr.Un1k0d3r
Hangovers and more: Bacon	3	436	SynneR
Crypto Leak	4	39	NSEC 2018 (Towel)
Crypto Object	4	160	GoSec CTF 2014
Crypto over the network	4	105	Mr.Un1k0d3r
Encrypted Zip	4	464	Mr.Un1k0d3r
Let's Play Scrabble! Part 2	5	11	Madness
Jabber	5	5	Madness
Is it a secure string?	5	217	Cedrick Chaput
Free Flag Encrypter	5	14	Towel
Pattern is the key	6	38	Mr.Un1k0d3r
TotalSecure Message Encrypter	6	78	Towel
Welcome to the asylum	6	51	GoSec CTF 2014
Homemade craptography #2	7	4	holyvier(ft. large software company)
Jabber Part 2	7	5	Madness
Crypto is not good as you think	8	149	Mr.Un1k0d3r
Mars Log	8	6	NSEC 2018 (Towel)
Homemade Craptography	8	6	NSEC 2018 (Holyvier)
Spies	9	28	CS Games 2016 (HoLyVieR)
Rusty RSA message signing service	9	10	b0n0n & An0n
TotalSecure Message Encrypter V2	10	17	Towel
Polly Wants a Cracker	10	2	Madness
Unicorn As A Service	11	7	Towel

Exotic Data Storage (4)

Challenges descriptions	Points	Validation	Author
Just another login form	2	1350	Mr.Un1k0d3r
DON'T login as admin	2	21	mbergeron
I forgot my password	3	21	mbergeron
Inspiration	6	26	NSEC 2019 (becojo)

Forensics (28)

Challenges descriptions	Points	Validation	Author
Who I am part 2	1	380	Mr.Un1k0d3r
I made a dd of Agent Smith usb key	1	2633	Cedrick Chaput
I love cat	2	392	Mr.Un1k0d3r
Dr. Pouce	2	1961	Cedrick Chaput
Attention Dinosaure Survive	2	1070	PRL
The good, the bad and the ugly	2	64	Mr.Un1k0d3r
1 / 3 Do not waste the environment	2	828	PRL
Hide my ass in my home!	2	1267	Cedrick Chaput
Hey Chuck where is the flag?	2	1243	Mr.Un1k0d3r
Meat Loaf	2	204	Ekse
Who I am?	2	785	Mr.Un1k0d3r
The words flew but writing remains	3	133	Martin Dube
2 / 3 Did you see my desktop?	3	705	PRL
Are you Twisted Insane?	3	24	Cedrick Feat Mr.Un1k0d3r
Someone steal my flag!	3	317	Mr.Un1k0d3r
802.1X Part 1	4	50	NSEC 2015
3 / 3 Suspicious account password?	4	577	PRL
Poor internet connection	4	349	Cedrick Chaput
Agent Smith reloaded	4	220	Cedrick Chaput
R.I.P MsPaint	4	87	Misker
We got breached	5	175	Mr.Un1k0d3r
Someone steal my flag again	5	99	GoSec CTF 2014
Ping pong	5	75	SynneR
Spy my girl	5	165	Cedrick Chaput
We got breached again	6	131	Mr.Un1k0d3r
Russian Crypto Roulette	6	61	SynneR
Really Depressed Protocol	7	67	SynneR
802.1X Part 2	8	37	NSEC 2015

Jail Escaping (21)

Challenges descriptions	Points	Validation	Author
Bash Jail 1	1	1821	Mr.Un1k0d3r
Bash Jail 2	2	1174	Mr.Un1k0d3r
Bash Jail 3	3	662	Mr.Un1k0d3r
Bash Jail 4	4	360	Mr.Un1k0d3r
Bash Jail 5	6	154	Mr.Un1k0d3r
Bash Jail 6	8	18	Garigouster
Bash Jail 7	12	13	Garigouster
C Jail 1	1	292	Mr.Un1k0d3r
C Jail 2	2	195	Mr.Un1k0d3r
C Jail 3	3	161	Mr.Un1k0d3r
C Jail 4	5	15	Garigouster
C Jail 5	7	10	Garigouster
C Jail 6	14	5	Garigouster
PHP Jail 1	1	468	Mr.Un1k0d3r
PHP Jail 2	2	306	Mr.Un1k0d3r
PHP Jail 3	3	206	Mr.Un1k0d3r
PHP Jail 4	4	153	Mr.Un1k0d3r
PHP Jail 5	6	124	Mr.Un1k0d3r
PyJail 1	3	189	Martin Dube
PyJail 2	5	104	Martin Dube
PyJail 3	6	35	Martin Dube

JavaScript (10)

Challenges descriptions	Points	Validation	Author
Client side validation is bad!	1	5953	Mr.Un1k0d3r
Hashing is more secure	1	5179	Mr.Un1k0d3r
Then obfuscation is more secure	1	3906	Mr.Un1k0d3r
Most Secure Crypto Algo	2	1340	Mr.Un1k0d3r
Valid key required	2	781	Francois Lajeunesse
Why not?	2	3144	Mr.Un1k0d3r
Why not be more secure?	5	477	Mr.Un1k0d3r
WTF Lol!	6	223	HoLyVieR
Interstellar PhoneBook	6	29	NSEC 2018 (Holyvier)
Beauty and the beast	7	32	Mr.Un1k0d3r

Malware Analysis (17)

Challenges descriptions	Points	Validation	Author
APT 1337	4	30	NSEC 2017 (Mr.Un1k0d3r)
Capture 1 Part 1	1	525	Mr.Un1k0d3r
Capture 1 Part 2	1	174	Mr.Un1k0d3r
Capture 1 Part 3	1	199	Mr.Un1k0d3r
Capture 1 Part 4	2	19	Mr.Un1k0d3r
Capture 1 Part 5	3	47	Mr.Un1k0d3r
Capture 1 Part 6	3	129	Mr.Un1k0d3r
Capture 1 Part 7	3	25	Mr.Un1k0d3r
Capture 2 Part 1	1	50	Mr.Un1k0d3r
Capture 2 Part 2	1	88	Mr.Un1k0d3r
Capture 2 Part 3	1	89	Mr.Un1k0d3r
Capture 2 Part 4	3	88	Mr.Un1k0d3r
Capture 2 Part 5	4	33	Mr.Un1k0d3r
Capture 2 Part 6	7	14	Mr.Un1k0d3r
Just Another MBR Ransomware	8	15	Towel
RAO democracy	4	44	NSEC 2017 (Mr.Un1k0d3r)
WebShell of Hell	5	7	An0n

Pwnage Linux (19)

Challenges descriptions	Points	Validation	Author
Level1 Pwnage Linux Level Up	1	556	P-Y Feat Martin Dube
Level2 Pwnage Linux Level Up	2	351	P-Y Feat Martin Dube
Remote Auth	2	96	NSEC 2015
Level3 Pwnage Linux Level Up	3	252	P-Y Feat Martin Dube
Level1 Pwnage Linux x86_64	3	176	Mr.Un1k0d3r
Level2 Pwnage Linux x86_64	4	60	Mr.Un1k0d3r
Sometime there is no buffer overflow	4	70	Mr.Un1k0d3r
Can you get the service password	4	110	Mr.Un1k0d3r
Level4 Pwnage Linux Level Up	5	119	Mr.Un1k0d3r
Friendly race	5	21	Garigouster
RPCFTW!	6	26	NSEC 2015
Jack the heaper	6	18	uaf.io
Level3 Pwnage Linux x86_64	7	56	Mr.Un1k0d3r
Level4 Pwnage Linux x86_64	7	33	Mr.Un1k0d3r
Just another useless service	8	34	NSEC 2015
Take over the Virtual World	8	26	NSEC 2015
Base64 As A Service	8	26	Guilt
Base64 As A Service Reloaded	9	21	Guilt
Delivery As A Service	10	14	NSEC 2016

Reverse Engineering (52)

Challenges descriptions	Points	Validation	Author
Time to learn x86 ASM & gdb	2	1820	Mr.Un1k0d3r
Can you see through the star	2	1080	Mr.Un1k0d3r
See No Evil - Part 1	2	48	alxbl
Crack Me 1	3	702	Mr.Un1k0d3r
Heap allocator	3	229	NSEC 2015
Intro To Sparc	3	136	Ian-Kyle Wagner
Kernel introduction	3	218	Mr.Un1k0d3r
See No Evil - Part 2	3	35	alxbl
See No Evil - Part 3	3	35	alxbl
Introduction to MIPS	3	284	Mr.Un1k0d3r
Windows x86 reversing is cool	3	634	Mr.Un1k0d3r
I never forget the Nintendo 64	3	567	Mr.Un1k0d3r
Power to the people	4	47	NSEC 2015
Altera?	4	48	NSEC 2016
ASM Lovers	4	77	NSEC 2016
See No Evil - Part 5	4	23	alxbl
Old School	4	53	Towel
I love tea!	4	5	nic-lovin
See No Evil - Part 4	4	26	alxbl
Let's take a detour	4	72	Floesen
Windows API for the win	4	297	Mr.Un1k0d3r
Wrong byte!	4	247	Mr.Un1k0d3r
Introduction to ARM	4	320	Mr.Un1k0d3r
Virtual World	5	53	NSEC 2015
Phenix Golgoth	5	40	Hackfest 2016
WASM Part 1	5	49	NSEC 2018 (Isra17)
RingZer0 Authenticator	5	215	Ekse
Back to our roots	5	96	Mr.Un1k0d3r
Can I speak with the kernel?	5	55	Zerosum0x0
The MI7 password prompt	5	45	NSEC 2018 (Mr.Un1k0d3r)
Smart enough?	5	97	NSEC 2015
Pwndr3 Authenticator	5	48	Pwndr3
I Think I forgot to take out the garbage!	6	18	Mr.Un1k0d3r
Need a client	6	71	Mr.Un1k0d3r
Flag stealer	6	64	Ekse
Update Manager	6	50	Ekse
The supreme bash	7	19	NSEC 2017 (Mr.Un1k0d3r)
SOS Lib	7	22	Mr.Un1k0d3r
Buggy Bunny	7	10	Garigouster
Armed and ready	7	11	NSEC 2015
Rebate As A Service	8	36	NSEC 2016
You're not welcome	8	47	Towel
WASM Part 2	8	8	NSEC 2018 (Isra17)
License to kill	8	0	Mr.Un1k0d3r
The Matrix	9	10	Towel
Trolling the troll	10	30	Mr.Un1k0d3r
Keygen time again	10	30	GoSec CTF 2014
The unknown challenge	11	16	Mr.Un1k0d3r
WASM Part 3	12	6	NSEC 2018 (Isra17)
You're not welcome again!	12	20	Towel
The oracle	13	17	Towel
Mars Reloaded	18	8	NSEC 2018 (Towel)

Shellcoding (7)

Challenges descriptions	Points	Validation	Author
Basics of Linux x64 shellcoding	2	469	Mr.Un1k0d3r
Linux x64 shellcoding level 2	4	238	Mr.Un1k0d3r
Linux x64 shellcoding level 3	6	183	Mr.Un1k0d3r
Linux x64 shellcoding level 4	8	146	Mr.Un1k0d3r
Linux x64 shellcoding level 5	10	101	Mr.Un1k0d3r
Linux x64 shellcoding level 6	12	84	Mr.Un1k0d3r
Linux x64 shellcoding level 7	14	44	Mr.Un1k0d3r

SQL Injection (32)

Challenges descriptions	Points	Validation	Author
Most basic SQLi pattern.	1	7449	Mr.Un1k0d3r
Random Login Form	2	1333	Mr.Un1k0d3r
Po po po po postgresql	2	1474	Mr.Un1k0d3r
Login portal 1	2	2759	Mr.Un1k0d3r
ACL rulezzz the world.	2	3820	Mart
Login portal 2	3	472	Mr.Un1k0d3r
Don't mess with Noemie; she hates admin!	3	659	Mr.Un1k0d3r
0 Day Store	3	112	NSEC 2015
What's the definition of NULL	3	584	Mr.Un1k0d3r
Don't Stumble in the Process	4	41	mbergeron
Brain Teaser 1	4	18	Sideni
Quote of the day	4	534	Mr.Un1k0d3r
No more hacking for me!	4	259	Mr.Un1k0d3r
Thinking outside the box is the key	4	461	Mr.Un1k0d3r
Quote of the day reloaded	5	206	Mr.Un1k0d3r
When it's lite it's not necessarily easy	6	187	Mr.Un1k0d3r
Login portal 3	6	212	Mr.Un1k0d3r
Hot Single Mom	6	142	GoSec CTF 2014
Internet As A Service	7	83	Mr.Un1k0d3r
Size DOES matter	7	126	Mr.Un1k0d3r
Brain Teaser 2	7	11	Sideni
/etc/passwd	7	131	Mr.Un1k0d3r
Groups of hacker	7	148	Mr.Un1k0d3r
Login portal 4	7	130	Mr.Un1k0d3r
Login portal 5	8	68	Mr.Un1k0d3r
The useless search tool	8	113	Mr.Un1k0d3r
stackoverflow.com lied to me... again	9	69	Corb3nik
Doctor Who ?	9	7	Sideni
Login portal 6	10	56	Mr.Un1k0d3r
SQHell	11	13	Sideni feat. mbergeron
Don't Stumble in the Process Reloaded	12	8	mbergeron
!Mysql + Brain fart	13	30	Mr.Un1k0d3r

Steganography (25)

Challenges descriptions	Points	Validation	Author
You're lost? Use the map	1	1348	Mr.Un1k0d3r
Victor you're hidding me something	1	2010	Cedrick Chaput
SigID Level 1	1	817	Guenael
Pixel Everywhere	2	102	Mr.Un1k0d3r
I'm Goronyo Babad Nigerian prince	2	383	Mr.Un1k0d3r
The vestige of dial-up Internet	2	72	Uid0
Missing Pieces	2	636	Cedrick Chaput
Brainsick	2	704	Mr.Un1k0d3r
Hidden In Plain Sight	2	514	NSEC 2015
The Sloth	2	93	Misker
Victor reloaded	2	837	Cedrick Chaput
A ghost sound	2	687	Cedrick Chaput
Look inside the house	2	757	Mr.Un1k0d3r
Crazy Cat Lady	3	51	Madness
Love Letter	3	160	Towel
5 beautiful colors	3	33	PublicName
Can you see through the matrix!	3	127	Mr.Un1k0d3r
Your old friend Orloge Simard	3	495	Cedrick Chaput
Not just 64	4	11	Madness
Stay Classy!	4	17	Sideni
Can you see through the matrix reloaded!	4	26	Towel
Even the Odds	4	10	alxbl
Walk the line!	5	126	Cedrick Chaput
Stop the violence	5	15	jusb3
SigID Level 2	6	11	Guenael

SysAdmin Linux (8)

Challenges descriptions	Points	Validation	Author
SysAdmin Part 1	1	1995	Cedrick Chaput
SysAdmin Part 2	1	1424	Cedrick Feat Mr.Un1k0d3r
SysAdmin Part 3	1	856	Mr.Un1k0d3r
SysAdmin Part 4	2	859	Cedrick Feat Mr.Un1k0d3r
SysAdmin Part 5	2	512	Cedrick Feat Mr.Un1k0d3r
SysAdmin Part 6	3	488	Cedrick Chaput
SysAdmin Part 7	4	393	Cedrick Chaput
SysAdmin Part 8	4	465	Cedrick Feat Mr.Un1k0d3r

The NC8 Reverse Engineering Track (6)

Challenges descriptions	Points	Validation	Author
NC8 MAINFRAME MANAGEMENT INTERFACE Part 1	7	39	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 1	3	24	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 2	7	23	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 3	10	22	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 3	5	16	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 4	15	14	NSEC 2018 (isra17)

Web Warning (42)

Challenges descriptions	Points	Validation	Author
Area 51	1	2193	Mr.Un1k0d3r
Words mean something?	1	2335	Mr.Un1k0d3r
Headache	1	2974	Mr.Un1k0d3r
Hacking skill are optional	1	92	Breached Company
Big Brother is watching	1	3282	Mr.Un1k0d3r
Looking for password file	1	3299	Mr.Un1k0d3r
XSS Challenge 1	2	281	Mr.Un1k0d3r
Admin Portal	2	1011	Mr.Un1k0d3r
Password reset	2	795	Mr.Un1k0d3r
XSS Challenge 2	2	297	Mr.Un1k0d3r
PHP Fairy	2	626	nic-Lovin
Unreadable captcha	2	317	SynneR
Malicious upload	2	451	Mr.Un1k0d3r
Security thru obscurity!	2	852	Mr.Un1k0d3r
Captcha I	2	453	SynneR
PHP feature or 0day?	3	338	Mr.Un1k0d3r
JWT pitfall 1	3	27	Mr.Un1k0d3r
REST in peace	3	188	GoSec CTF 2014
Serial killer!	3	399	Mr.Un1k0d3r
Password reset reloaded	3	312	Mr.Un1k0d3r
Looking for the flag?	3	622	Mr.Un1k0d3r
Facebook will never forget this one	3	177	Mr.Un1k0d3r
XSS Challenge 4	3	166	Mr.Un1k0d3r
XSS Challenge 3	3	148	Mr.Un1k0d3r
Propaganda mail	4	194	NSEC 2015
Captcha II	4	114	SynneR
Captcha III	4	32	mbergeron
Lost API	5	14	holyvier (NSEC 2019)
Password Reset As a Service	5	41	Mr.Un1k0d3r
Super Lottery	5	42	Sparkix
Read the unreadable	5	82	Mr.Un1k0d3r
Freedom Firewall	5	95	NSEC 2015
The archive	5	12	holyvier (NSEC 2019)
Timesheet As a Service	5	22	Mr.Un1k0d3r
I hate this one	6	194	Mr.Un1k0d3r
Serial killer part 2	6	38	HoLyVieR
PHP feature or 0day reloaded?	6	66	Mr.Un1k0d3r
XSS Challenge 5	6	99	Mr.Un1k0d3r
Orao's factory	6	95	NSEC 2015
XPATH of hell!	7	115	Francois L. Feat Mr.Un1k0d3r
Secure Mail	8	67	GoSec CTF 2014
Looking for god in your life?	8	58	NSEC 2015

Flag statistics (146593 submitted so far)

Number of points	Number of validation	Number of points	Number of validation
18 points	8	15 points	14
14 points	49	13 points	47
12 points	131	11 points	36
10 points	272	9 points	145
8 points	860	7 points	1833
6 points	4063	5 points	3888
4 points	8796	3 points	17286
2 points	47962	1 points	61203

Shoutbox Have more questions? You can join the Slack Channel https://ringzer0-slack-invite.herokuapp.com/

2020-01-20 09:13:05 - rina I can't get ssh connection with "SysAdmin Part 6", is everything ok with the task?
2020-01-17 23:26:16 - antho-newbie xss bot
2020-01-17 04:03:42 - Towel Challenge 231 (I'm Goronyo Babad Nigerian prince) is up and working again.
2020-01-06 17:14:57 - madness @speles You appear to be correct.
2020-01-05 15:59:08 - speles Hi! Is https://ringzer0ctf.com/challenges/231 still solvable? The (seemingly correct) decoder produces garbage output for me.
2019-12-21 22:58:40 - team_rocket chal 180 (friendly race) is down.
2019-12-20 09:33:58 - cowthecows plzzz help me with level1 jail escape challenge
2019-11-18 18:11:00 - jmiller I can't ssh into the 'Sometime there is no buffer overflow' challenge. Is it down?
2019-11-08 14:29:32 - madness For capture 1 part 5, I found two passwords (one is obtained from the other), but the challenge page is not accepting. Anyone?
2019-11-03 22:20:28 - madness Is "I need a client" included in the statement "Virtual world sandbox is down"? Thanks

close Intercepting SSL Traffic on RingZer0team.com

If you are using Burpsuite as your proxy, you may experiment some issue regarding interception. If you got the following error unrecognized_name here is the solution. Go to the main tab on your Burp then click on options you should now see the SSL tab. In the SSL Negociation section, check "Disable Java SNI extension (requires restart)" Restart your Burp instance and you are good to go.