Challenges

320 challenges are currently available

RingZer0 Team provide you couple of tools that can help you. See available tools.

Means challenge completed.

Point to write-up that worth to be reading.

Earn RingZer0Gold for each of your write-up.

You have the opportunity to submit a write up for every challenge you successfully complete. Every time your write up is approved your earn RingZer0Gold. It's possible for you to exchange this gold for hints. The main goal of this initiative is to stimulate people to submit write up and share how they solved a challenge with other people. When you finish a challenge, you have the ability to view all published write up for the challenge. This way you can learn many ways to solve a unique challenge.

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	2423	Mr.Un1k0d3r
Ask your grandpa!	2	911	Mr.Un1k0d3r's Dad
Hash me reloaded	3	1360	Mr.Un1k0d3r
I hate mathematics	3	1465	Mr.Un1k0d3r
Ask your grandpa again!	4	296	Mr.Un1k0d3r's Dad
Hash breaker	4	1111	Mr.Un1k0d3r
I saw a little elf	4	397	Mr.Un1k0d3r
Hash breaker reloaded	5	652	Mr.Un1k0d3r
Execute me if you can	5	338	Mr.Un1k0d3r
Read me if you can	6	346	Mr.Un1k0d3r
Hash breaker reloaded again	6	218	Mr.Un1k0d3r
Ascii Art	6	525	Mr.Un1k0d3r
Execute me if you can again	6	167	Mr.Un1k0d3r
Xor me if you can	6	331	Mr.Un1k0d3r
Number game	7	245	Mr.Un1k0d3r remade by theindian
Classic Sudoku	7	209	Mr.Un1k0d3r remade by dread_knight
Find the right word	7	261	Mr.Un1k0d3r

Cryptography (32)

Challenges descriptions	Points	Validation	Author
Some martian message	1	5097	Mr.Un1k0d3r
You're Drunk!	1	1035	Mr.Un1k0d3r
File recovery	1	2419	Mr.Un1k0d3r
Public key recovery	2	1187	Mr.Un1k0d3r
Fashion Victim	2	389	GoSec CTF 2014
Martian message part 2	2	2219	Mr.Un1k0d3r
Can you understand this sentence?	3	540	Mr.Un1k0d3r
Let's Play Scrabble!	3	21	Madness
I Lost my password	3	933	Mr.Un1k0d3r
Martian message part 3	3	834	Mr.Un1k0d3r
Hangovers and more: Bacon	3	427	SynneR
Crypto Leak	4	37	NSEC 2018 (Towel)
Crypto Object	4	155	GoSec CTF 2014
Crypto over the network	4	105	Mr.Un1k0d3r
Encrypted Zip	4	453	Mr.Un1k0d3r
Let's Play Scrabble! Part 2	5	9	Madness
Jabber	5	4	Madness
Is it a secure string?	5	214	Cedrick Chaput
Free Flag Encrypter	5	14	Towel
Pattern is the key	6	38	Mr.Un1k0d3r
TotalSecure Message Encrypter	6	76	Towel
Welcome to the asylum	6	49	GoSec CTF 2014
Homemade craptography #2	7	4	holyvier(ft. large software company)
Jabber Part 2	7	4	Madness
Crypto is not good as you think	8	148	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	1336	Mr.Un1k0d3r
DON'T login as admin	2	19	mbergeron
I forgot my password	3	19	mbergeron
Inspiration	6	23	NSEC 2019 (becojo)

Forensics (28)

Challenges descriptions	Points	Validation	Author
Who I am part 2	1	360	Mr.Un1k0d3r
I made a dd of Agent Smith usb key	1	2572	Cedrick Chaput
I love cat	2	340	Mr.Un1k0d3r
Dr. Pouce	2	1914	Cedrick Chaput
Attention Dinosaure Survive	2	1042	PRL
The good, the bad and the ugly	2	63	Mr.Un1k0d3r
1 / 3 Do not waste the environment	2	808	PRL
Hide my ass in my home!	2	1239	Cedrick Chaput
Hey Chuck where is the flag?	2	1216	Mr.Un1k0d3r
Meat Loaf	2	198	Ekse
Who I am?	2	758	Mr.Un1k0d3r
The words flew but writing remains	3	131	Martin Dube
2 / 3 Did you see my desktop?	3	691	PRL
Are you Twisted Insane?	3	24	Cedrick Feat Mr.Un1k0d3r
Someone steal my flag!	3	307	Mr.Un1k0d3r
802.1X Part 1	4	49	NSEC 2015
3 / 3 Suspicious account password?	4	567	PRL
Poor internet connection	4	344	Cedrick Chaput
Agent Smith reloaded	4	215	Cedrick Chaput
R.I.P MsPaint	4	81	Misker
We got breached	5	172	Mr.Un1k0d3r
Someone steal my flag again	5	96	GoSec CTF 2014
Ping pong	5	74	SynneR
Spy my girl	5	160	Cedrick Chaput
We got breached again	6	129	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	1746	Mr.Un1k0d3r
Bash Jail 2	2	1124	Mr.Un1k0d3r
Bash Jail 3	3	637	Mr.Un1k0d3r
Bash Jail 4	4	346	Mr.Un1k0d3r
Bash Jail 5	6	144	Mr.Un1k0d3r
Bash Jail 6	8	17	Garigouster
Bash Jail 7	12	13	Garigouster
C Jail 1	1	282	Mr.Un1k0d3r
C Jail 2	2	188	Mr.Un1k0d3r
C Jail 3	3	155	Mr.Un1k0d3r
C Jail 4	5	15	Garigouster
C Jail 5	7	10	Garigouster
C Jail 6	14	5	Garigouster
PHP Jail 1	1	453	Mr.Un1k0d3r
PHP Jail 2	2	296	Mr.Un1k0d3r
PHP Jail 3	3	199	Mr.Un1k0d3r
PHP Jail 4	4	149	Mr.Un1k0d3r
PHP Jail 5	6	120	Mr.Un1k0d3r
PyJail 1	3	180	Martin Dube
PyJail 2	5	99	Martin Dube
PyJail 3	6	34	Martin Dube

JavaScript (10)

Challenges descriptions	Points	Validation	Author
Client side validation is bad!	1	5823	Mr.Un1k0d3r
Hashing is more secure	1	5073	Mr.Un1k0d3r
Then obfuscation is more secure	1	3820	Mr.Un1k0d3r
Most Secure Crypto Algo	2	1299	Mr.Un1k0d3r
Valid key required	2	759	Francois Lajeunesse
Why not?	2	3111	Mr.Un1k0d3r
Why not be more secure?	5	468	Mr.Un1k0d3r
WTF Lol!	6	216	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	509	Mr.Un1k0d3r
Capture 1 Part 2	1	172	Mr.Un1k0d3r
Capture 1 Part 3	1	196	Mr.Un1k0d3r
Capture 1 Part 4	2	19	Mr.Un1k0d3r
Capture 1 Part 5	3	45	Mr.Un1k0d3r
Capture 1 Part 6	3	129	Mr.Un1k0d3r
Capture 1 Part 7	3	23	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	533	P-Y Feat Martin Dube
Level2 Pwnage Linux Level Up	2	341	P-Y Feat Martin Dube
Remote Auth	2	96	NSEC 2015
Level3 Pwnage Linux Level Up	3	249	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	55	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	1775	Mr.Un1k0d3r
Can you see through the star	2	1065	Mr.Un1k0d3r
See No Evil - Part 1	2	39	alxbl
Crack Me 1	3	689	Mr.Un1k0d3r
Heap allocator	3	219	NSEC 2015
Intro To Sparc	3	131	Ian-Kyle Wagner
Kernel introduction	3	214	Mr.Un1k0d3r
See No Evil - Part 2	3	32	alxbl
See No Evil - Part 3	3	31	alxbl
Introduction to MIPS	3	277	Mr.Un1k0d3r
Windows x86 reversing is cool	3	618	Mr.Un1k0d3r
I never forget the Nintendo 64	3	557	Mr.Un1k0d3r
Power to the people	4	45	NSEC 2015
Altera?	4	48	NSEC 2016
ASM Lovers	4	76	NSEC 2016
See No Evil - Part 5	4	20	alxbl
Old School	4	50	Towel
I love tea!	4	3	nic-lovin
See No Evil - Part 4	4	23	alxbl
Let's take a detour	4	71	Floesen
Windows API for the win	4	288	Mr.Un1k0d3r
Wrong byte!	4	243	Mr.Un1k0d3r
Introduction to ARM	4	314	Mr.Un1k0d3r
Virtual World	5	53	NSEC 2015
Phenix Golgoth	5	40	Hackfest 2016
WASM Part 1	5	48	NSEC 2018 (Isra17)
RingZer0 Authenticator	5	210	Ekse
Back to our roots	5	95	Mr.Un1k0d3r
Can I speak with the kernel?	5	55	Zerosum0x0
The MI7 password prompt	5	45	NSEC 2018 (Mr.Un1k0d3r)
Smart enough?	5	96	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	29	GoSec CTF 2014
The unknown challenge	11	15	Mr.Un1k0d3r
WASM Part 3	12	6	NSEC 2018 (Isra17)
You're not welcome again!	12	19	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	462	Mr.Un1k0d3r
Linux x64 shellcoding level 2	4	235	Mr.Un1k0d3r
Linux x64 shellcoding level 3	6	181	Mr.Un1k0d3r
Linux x64 shellcoding level 4	8	142	Mr.Un1k0d3r
Linux x64 shellcoding level 5	10	99	Mr.Un1k0d3r
Linux x64 shellcoding level 6	12	83	Mr.Un1k0d3r
Linux x64 shellcoding level 7	14	44	Mr.Un1k0d3r

SQL Injection (32)

Challenges descriptions	Points	Validation	Author
Most basic SQLi pattern.	1	7287	Mr.Un1k0d3r
Random Login Form	2	1268	Mr.Un1k0d3r
Po po po po postgresql	2	1404	Mr.Un1k0d3r
Login portal 1	2	2692	Mr.Un1k0d3r
ACL rulezzz the world.	2	3761	Mart
Login portal 2	3	444	Mr.Un1k0d3r
Don't mess with Noemie; she hates admin!	3	633	Mr.Un1k0d3r
0 Day Store	3	106	NSEC 2015
What's the definition of NULL	3	564	Mr.Un1k0d3r
Don't Stumble in the Process	4	38	mbergeron
Brain Teaser 1	4	16	Sideni
Quote of the day	4	519	Mr.Un1k0d3r
No more hacking for me!	4	253	Mr.Un1k0d3r
Thinking outside the box is the key	4	447	Mr.Un1k0d3r
Quote of the day reloaded	5	202	Mr.Un1k0d3r
When it's lite it's not necessarily easy	6	183	Mr.Un1k0d3r
Login portal 3	6	209	Mr.Un1k0d3r
Hot Single Mom	6	140	GoSec CTF 2014
Internet As A Service	7	79	Mr.Un1k0d3r
Size DOES matter	7	124	Mr.Un1k0d3r
Brain Teaser 2	7	9	Sideni
/etc/passwd	7	126	Mr.Un1k0d3r
Groups of hacker	7	144	Mr.Un1k0d3r
Login portal 4	7	128	Mr.Un1k0d3r
Login portal 5	8	67	Mr.Un1k0d3r
The useless search tool	8	110	Mr.Un1k0d3r
stackoverflow.com lied to me... again	9	65	Corb3nik
Doctor Who ?	9	6	Sideni
Login portal 6	10	56	Mr.Un1k0d3r
SQHell	11	12	Sideni feat. mbergeron
Don't Stumble in the Process Reloaded	12	7	mbergeron
!Mysql + Brain fart	13	29	Mr.Un1k0d3r

Steganography (25)

Challenges descriptions	Points	Validation	Author
You're lost? Use the map	1	1316	Mr.Un1k0d3r
Victor you're hidding me something	1	1966	Cedrick Chaput
SigID Level 1	1	796	Guenael
Pixel Everywhere	2	97	Mr.Un1k0d3r
I'm Goronyo Babad Nigerian prince	2	372	Mr.Un1k0d3r
The vestige of dial-up Internet	2	72	Uid0
Missing Pieces	2	620	Cedrick Chaput
Brainsick	2	687	Mr.Un1k0d3r
Hidden In Plain Sight	2	504	NSEC 2015
The Sloth	2	89	Misker
Victor reloaded	2	822	Cedrick Chaput
A ghost sound	2	678	Cedrick Chaput
Look inside the house	2	746	Mr.Un1k0d3r
Crazy Cat Lady	3	49	Madness
Love Letter	3	153	Towel
5 beautiful colors	3	33	PublicName
Can you see through the matrix!	3	126	Mr.Un1k0d3r
Your old friend Orloge Simard	3	488	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	9	alxbl
Walk the line!	5	124	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	1922	Cedrick Chaput
SysAdmin Part 2	1	1364	Cedrick Feat Mr.Un1k0d3r
SysAdmin Part 3	1	813	Mr.Un1k0d3r
SysAdmin Part 4	2	825	Cedrick Feat Mr.Un1k0d3r
SysAdmin Part 5	2	483	Cedrick Feat Mr.Un1k0d3r
SysAdmin Part 6	3	465	Cedrick Chaput
SysAdmin Part 7	4	373	Cedrick Chaput
SysAdmin Part 8	4	444	Cedrick Feat Mr.Un1k0d3r

The NC8 Reverse Engineering Track (6)

Challenges descriptions	Points	Validation	Author
NC8 MAINFRAME MANAGEMENT INTERFACE Part 1	7	36	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 1	3	23	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 2	7	22	NSEC 2018 (isra17)
NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 3	10	21	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	2118	Mr.Un1k0d3r
Words mean something?	1	2280	Mr.Un1k0d3r
Headache	1	2900	Mr.Un1k0d3r
Hacking skill are optional	1	88	Breached Company
Big Brother is watching	1	3215	Mr.Un1k0d3r
Looking for password file	1	3218	Mr.Un1k0d3r
XSS Challenge 1	2	264	Mr.Un1k0d3r
Admin Portal	2	982	Mr.Un1k0d3r
Password reset	2	781	Mr.Un1k0d3r
XSS Challenge 2	2	284	Mr.Un1k0d3r
PHP Fairy	2	601	nic-Lovin
Unreadable captcha	2	311	SynneR
Malicious upload	2	438	Mr.Un1k0d3r
Security thru obscurity!	2	833	Mr.Un1k0d3r
Captcha I	2	448	SynneR
PHP feature or 0day?	3	324	Mr.Un1k0d3r
JWT pitfall 1	3	21	Mr.Un1k0d3r
REST in peace	3	187	GoSec CTF 2014
Serial killer!	3	392	Mr.Un1k0d3r
Password reset reloaded	3	304	Mr.Un1k0d3r
Looking for the flag?	3	609	Mr.Un1k0d3r
Facebook will never forget this one	3	170	Mr.Un1k0d3r
XSS Challenge 4	3	161	Mr.Un1k0d3r
XSS Challenge 3	3	143	Mr.Un1k0d3r
Propaganda mail	4	189	NSEC 2015
Captcha II	4	112	SynneR
Captcha III	4	31	mbergeron
Lost API	5	10	holyvier (NSEC 2019)
Password Reset As a Service	5	37	Mr.Un1k0d3r
Super Lottery	5	38	Sparkix
Read the unreadable	5	75	Mr.Un1k0d3r
Freedom Firewall	5	93	NSEC 2015
The archive	5	9	holyvier (NSEC 2019)
Timesheet As a Service	5	22	Mr.Un1k0d3r
I hate this one	6	189	Mr.Un1k0d3r
Serial killer part 2	6	37	HoLyVieR
PHP feature or 0day reloaded?	6	65	Mr.Un1k0d3r
XSS Challenge 5	6	97	Mr.Un1k0d3r
Orao's factory	6	93	NSEC 2015
XPATH of hell!	7	109	Francois L. Feat Mr.Un1k0d3r
Secure Mail	8	63	GoSec CTF 2014
Looking for god in your life?	8	57	NSEC 2015

Flag statistics (142703 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	46
12 points	128	11 points	34
10 points	268	9 points	140
8 points	845	7 points	1773
6 points	3958	5 points	3793
4 points	8553	3 points	16796
2 points	46698	1 points	59600

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

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
2019-11-02 23:32:15 - madness I have finished "intro to Sparc". Now I'd like to run it in an emulator. Has anyone done that and is willing to talk about it?
2019-11-01 09:57:56 - zirconia57 Jail Escaping / C Jail *: none of them work since a week. Code can't compile: -- mkdir: cannot create directory ‘/tmp/d28...da3’: No space left on device
2019-10-31 06:05:03 - phuctran25 @Towel I'm sorry for that because while I am sending this message RingZer0 is down so it sends a lot of message instead
2019-10-29 18:09:48 - Towel @phuctran25 - The challenge works as intended. I know what you're talking about, but the challenge is working just fine. Do not spam the shoutbox.
2019-10-29 04:00:14 - phuctran25 https://ringzer0ctf.com/challenges/248 I think this challenge has an error. It tried to access a link, and when I decode that link and access it in a browser. The server said the link was removed. I think the content is essential for solving that challenge
2019-10-29 04:00:13 - phuctran25 https://ringzer0ctf.com/challenges/248 I think this challenge has an error. It tried to access a link, and when I decode that link and access it in a browser. The server said the link was removed. I think the content is essential for solving that challenge
2019-10-29 04:00:12 - phuctran25 https://ringzer0ctf.com/challenges/248 I think this challenge has an error. It tried to access a link, and when I decode that link and access it in a browser. The server said the link was removed. I think the content is essential for solving that challenge
2019-10-29 04:00:12 - phuctran25 https://ringzer0ctf.com/challenges/248 I think this challenge has an error. It tried to access a link, and when I decode that link and access it in a browser. The server said the link was removed. I think the content is essential for solving that challenge

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.