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# Internetwache 2016 : Misc (50)
**Category:** misc |**Points:** 50 |**Name:** The hidden message |**Solves:** 347 |**Description:**
> My friend really can't remember passwords. So he uses some kind of obfuscation. Can you restore the plaintext?>> File: > 0000000 126 062 126 163 142 103 102 153 142 062 065 154 111 121 ... |
# Internetwache 2016 : Rock with the wired shark! (misc70)
**Category:** misc |**Points:** 70 |**Name:** Rock with the wired shark! |**Solves:** 454 |**Description:**
> Sniffing traffic is fun. I saw a wired shark. Isn't that strange?>> Attachment: [misc70.zip](src/misc70.zip)
___
## Write-up
### Part OneUnzipping the ... |
# Internetwache 2016 : Code (70)
**Category:** Code |**Points:** 70 |**Name:** A numbers game II |**Solves:** 230 |**Description:**
> Math is used in cryptography, but someone got this wrong. Can you still solve the equations? Hint: You need to encode your answers.>>Attachment: code70.zip>>Service: 188.166.133.53:11071... |
# Internetwache 2016 : Code (90)
**Category:** Code |**Points:** 90 |**Name:** Dark Forest |**Solves:** 94 |**Description:**
> Someone pre-ordered a forest and now I'm lost in it. There are a lot of binary trees in front and behind of me. Some are smaller or equal-sized than others. Can you help me to invert the path a... |
### Misc 70 - Rock with the wired shark`Sniffing traffic is fun. I saw a wired shark. Isn't that strange?`
#ENIn this task we got dump.pcapng file to work on. We opened it in Wireshark and saw some tcp and http packets.Also HTTP GET /flag.zip request. If you follow tcp stream,
```GET /flag.zip HTTP/1.1Host: 192.168.1.4... |
## The hidden message (Misc, 50p)
My friend really can't remember passwords. So he uses some kind of obfuscation. Can you restore the plaintext? ###ENG[PL](#pl-version)
This was a really trivial task. Given text consisted of base-8 numbers, which interpreted asASCII yielded base64-encoded string. Reversing the encodin... |
# Internetwache 2016 : It's Prime Time! (60)
**Category:** code |**Points:** 60 |**Name:** It's Prime Time! |**Solves:** 388 |**Description:**
> We all know that prime numbers are quite important in cryptography. Can you help me to find some?>> Service: 188.166.133.53:11059
___
## Write-up
### Part ZeroWe were given a ... |
## Mess of Hash (Web, 50p)
Students have developed a new admin login technique. I doubt that it's secure, but the hash isn't crackable. I don't know where the problem is... ###ENG[PL](#pl-version)
In this task, we got a hash of password and are asked to log into the account. The hash was asfollows: 0e4083065367307319... |
## ServerfARM (RE, 70p)
Description: Someone handed me this and told me that to pass the exam, I have to extract a secret string. I know cheating is bad, but once does not count. So are you willing to help me?
###ENG[PL](#pl-version)
After reversing the provided ARM binary, we quickly find some print statements printi... |
## Hashdesigner (Crypto, 70p)
There was this student hash design contest. All submissions were crap, but had promised to use the winning algorithm for our important school safe. We hashed our password and got '00006800007d'. Brute force isn't effective anymore and the hash algorithm had to be collision-resistant, s... |
## Eso Tape (RE, 80p)
Description: I once took a nap on my keyboard. I dreamed of a brand new language, but I could not decipher it nor get its meaning. Can you help me? Hint: Replace the spaces with either '{' or '}' in the solution. Hint: Interpreters don't help. Operations write to the current index.
###ENG[PL](#p... |
## Oh Bob! (Crypto, 60p)
Alice wants to send Bob a confidential message. They both remember the crypto lecture about RSA. So Bob uses openssl to create key pairs. Finally, Alice encrypts the message with Bob's public keys and sends it to Bob. Clever Eve was able to intercept it. Can you help Eve to decrypt the messa... |
## 404 Flag not found (Misc, 80p)
I tried to download the flag, but somehow received only 404 errors :( Hint: The last step is to look for flag pattern. ###ENG[PL](#pl-version)
This task wsa more of stegano than misc. Pcap file contained a lot of requests to sites such as12332abc.example.com. After collecting all of ... |
### Exploitation 80
>Description: Printer are very very important for offices. Especially for remote printing. My boss told me to build a tool for that task.>[RemotePrinter](./RemotePrinter)
**Strings** util find "YAY, FLAG: %s.". So by looking into the binary we can find that function:
Ok so we pro... |
# Rev80 - Eso Tape
## Description
I once took a nap on my keyboard. I dreamed of a brand new language, but I could not decipher it nor get its meaning. Can you help me? Hint: Replace the spaces with either '{' or '}' in the solution. Hint: Interpreters don't help. Operations write to the current index.
## Solution
With... |
# IWCTF 2016 - Reversing - File Checker - 60 pts
> Description: My friend sent me this file. He told that if I manage to reverse it, I'll have access to all his devices. My misfortune that I don't know anything about reversing :/>> Attachment: [rev60.zip](rev60.zip)
# Write-up
```shell$ file filechecker filechecker: EL... |
# Interpolation (Reverse, 400)
> NEWTON is an autonomous unmanned aerial vehicle (UAV). Where the UAV is refueled at t=180 ?
> Path planning:> t x y> 0; 35.645592; 50.951123;> 20; 35.144068; 50.467725;> 40; 34.729775; 48.204541;> 60; 34.204433; 46.117139;> 80; 33.602623; 44.908643;> 100; 33.162285; 42.337842;> 120; 33.... |
# Misc90 - BarParty
## Description
Can you read the barcodes?
## Solution
This challenge was pretty fun. I printed the barcodes, cut them and put the barcode pieces together.
Those three barcodes gave us the flag.
```Flag: IW{BAR_B4r_C0d3s}``` |
# Crypto90 - The Bank
## Description
Everyone knows that banks are insecure. This one super secure and only allows only 20 transactions per session. I always wanted a million on my account.
## Solution
We only have 20 transactions to get to the million.
When we create a transaction, we enter the amount we want to trans... |
# Internetwache 2016 : Replace with Grace (web60)
**Category:** web |**Points:** 60 |**Name:** Replace with Grace |**Solves:** 268 |**Description:**
> Regular expressions are pretty useful. Especially when you need to search and replace complex terms.>> Service: https://replace-with-grace.ctf.internetwache.org/
___
## ... |
#Sh-ock###(exp90, solved by 105)
>Description: This is some kind of weird thing. I am sh-ocked.
>Service: 188.166.133.53:12589
First thing is first, let's see what we are working with...
`telnet 188.166.133.53 12589`
We are greeted with a small prompt where we can input data, let's try some stuff:
```$test[ReferenceErr... |
# Internetwache 2016 : The Secret Store (web70)
**Category:** web |**Points:** 70 |**Name:** The Secret Store |**Solves:** 285 |**Description:**
> We all love secrets. Without them, our lives would be dull. A student wrote a secure secret store, however he was babbling about problems with the database. Maybe I shouldn'... |
# Internetwache CTF 2016: Brute with Force (code 80)
>Description: People say, you’re good at brute forcing… Have fun! Hint: You don’t need to crack the 31. character (newline). Try to think of different (common) time representations. Service: 188.166.133.53:11117
Like with box of chocolates - you never know what... |
# Internetwache CTF 2016 : File Checker
**Category:** Reversing**Points:** 60**Solves:** 190**Description:**
> Description: My friend sent me this file. He told that if I manage to reverse it, I'll have access to all his devices. My misfortune that I don't know anything about reversing :/> > > Attachment: [rev60.zip](.... |
## TexMaker (Web, 90p)
Description: Creating and using coperate templates is sometimes really hard. Luckily, we have a webinterace for creating PDF files. Some people doubt it's secure, but I reviewed the whole code and did not find any flaws.
###ENG[PL](#pl-version)
In this task we could upload latex file, which ser... |
# Internetwache CTF 2016: 404 Flag not found (misc 80)
> I tried to download the flag, but somehow received only 404 errors :(
We also get network capture, with some DNS traffic and few `GET` requests. During solving this task, I was sure its something about networking and DNS querring. Man, how much I have tried DNS... |
#0ldsk00lBlog###(web80, solved by 264)
>Description: I stumbled across this kinda oldskool blog. I bet it is unhackable, I mean, there's only static HTML.
>Service: https://0ldsk00lblog.ctf.internetwache.org/
First things first, go to the service and then browse the page and source code:
<html><head> <title>0ldsk00l</t... |
## Impossible Game (Misc, 300p)
Imposible Game http://ctf.sharif.edu:38455/chal/img/ImpossibleGame.html
Download server.py
###ENG[PL](#pl-version)
We were given source code of server and had to play a game with it to get the flag. Reading the source code immediatelyreminded me an old riddle, available [here](ht... |
# Break In 2016 - Eighth Circles of Hell
**Category:** Steganography**Points:** 200**Solves:** 17**Description:**
> It’s Star Wars time again, and you found a hidden message from R2D2, it > supposedly can be decrypted of the Dark Force, help the Resistance to decode > the message.> > ![Attached Image](eighthcircleofhel... |
# SSCTF 2016 : Chain Rule 200
**Category:** Crypto-Exploit**Points:** 200**Solves:** 47**Description:**
> 该题目已有 47 个队伍完成> > It has completed by 47 teams> > 解题说明> > Description> > > Try 'start'> > 战题链接 <http://static.lab.seclover.com/crypto/crypto2-b7486602.zip>
## Write-up
One of the files has password "start". Inside ... |
## Crypto 300 (crypto, 300p)
### PL
[ENG](#eng-version)
Zadanie polegało na odwróceniu działania podanego algorytmu, zaimplementowanego w javascripcie, dla podanego zaszyfrowanego tekstu. Kod szyfrujący i deszyfrujący umieszczony w zadaniu znajduje się [tutaj](./crypto300.js)
Zaszyfrowanego tekst: `51136f3b763d7d5e591... |
# BKPCTF 2016: ltseorg
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| BKPCTF | ltseorg | Crypto | 4 |
### Description> make some (charlie)hash collisions! ltseorg.bostonkey.party 5555 [https://s3.amazonaws.com/bostonkeyparty/2016/a531382ad51f8cd2b74369e2127e11dfe... |
## QR Puzzle: Web (Unknown, 400p)
Solve the slide puzzle and decode the QR code. http://puzzle.quals.seccon.jp:42213/slidepuzzle
###PL[ENG](#eng-version)
Podobnie jak w poprzednich QR Puzzle dostajemy QR code i mamy go rozwiązać. Tym razem problemem jest to, że brakuje fragmentu kodu.
Z czasem zadan... |
# Exp90
## Description```We are given an IP address and a port to connect to, upon connecting we juste have a greeting message and what seems to be an interepreter```
## Solution
After poking around, we could see that the interpreter did not have a straightforward behavior.The error messages seemed to indicate that it ... |
#thread mem:# 00000-02000:---:ldt2:#1. 00000-02000:RWX:Text:CC# 02000-14000:---:ldt0:ds,es,fs#2. 12000-14000:RW-:Data# 14000-1C000:RWX:????# 1C000-2C000:RWX:ldt1:ss#3. 24000-2C000:RW-:Stack
# ecx translation# 00000-08000:Code, disallowed# 08000-10000:Stack + ecx - 8000# 10000- :Data + ecx - 10000
# ... |
# BKPCTF 2016: unholy
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| BKPCTF | unholy | Reversing | 4 |
### Description> python or ruby? why not both! [https://s3.amazonaws.com/bostonkeyparty/2016/9c2b8593c64486de25698fcece7c12fa0679a224.tar.gz](challenge)
## Writ... |
# 1. Leak heap address with star compositions tables# 2. Create new moon with fake pool header# 3. Create planet using fake pool header# 4. Corrupt planet to read anywhere# 5. Use pool header to write libc's __free_hook to magic execv(/bin/sh) address
from pwn import *#s = process(['./spacerex', '99999'])s = remote('sp... |
# Writeup for hmac_crc CRYPTO (5)
> We're trying a new mac here at BKP---HMAC-CRC. The hmac (with our key) of "zupe zecret" is '0xa57d43a032feb286'. What's the hmac of "BKPCTF"? https://s3.amazonaws.com/bostonkeyparty/2016/0c7433675c3c555afb77271d6a549bf5d941d2ab
original script can be downloaded below
[0c7433675c3c5... |
There was given following hmac function:
```pythonCRC_POLY = to_bits(65, (2**64) + 0xeff67c77d13835f7)CONST = to_bits(64, 0xabaddeadbeef1dea)
def crc(mesg): mesg += CONST shift = 0 while shift < len(mesg) - 64: if mesg[shift]: for i in range(65): mesg[shift + i] ^= CRC_POLY[i] shift += 1 return mesg[-... |
[](ctf=internetwasche-ctf-2016)[](type=reverse)[](tags=prime,fraction,fractran,math)[](tools=hopper,gdb)[](techniques=)
# Alewife reverse-5
We are given
```bash$ file 05223a3cae8b71d81592d5977fb1c3622bcbf79305223a3cae8b71d81592d5977fb1c3622bcbf793: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked... |
Participated as dcua.
## Good Morning (3pt)
The server pretty seem to be decent, but I've wasted a lot of time testing in a local server.
The intended way was to bypass the escape_string() feature, by eating up the escaped character to make one backslash with one quote. (```\\"``` => ```?\"```)
bypassing ```escape_str... |
### Solved by Swappage and superkojiman
simple calc is an x64 ELF Binary exploitation challenge, the objective was to pop a shell and read the flag.
The application starts by printing a welcome message and asking us how many calculations we are planning to do with the program.
0x004013d5 e899ffffff call sym.pr... |
Participated as dcua.
## Good Morning (3pt)
The server pretty seem to be decent, but I've wasted a lot of time testing in a local server.
The intended way was to bypass the escape_string() feature, by eating up the escaped character to make one backslash with one quote. (```\\"``` => ```?\"```)
bypassing ```escape_str... |
##4042 (Misc/Crypto, 100p)
```Unknown document is found in ancient ruins, in 2005.Could you figure out what is written in the document?```
###PL[ENG](#eng-version)
Dostajemy [plik](no-network.txt) który mamy zdekodować. Podpowiedź stanowi `4042` oraz rok `2005`. Pozwala nam to dotrzeć do RFC4042: https://www.ietf.org/r... |
# Programming (Pretty much _"Recon"_)
##Programming 1**Q: So you reached Delhi and now the noise in your head is not allowing you to think rationally. The Nosise in your head has origin its Origin in your Stomach. And this is a big hunger. You can finish one or probably 2 Tandoori Chicken. So where can you get the best... |
# HI (Reverse, 200)
In the task description we are given the following info:
>The Program is registerd for following system specification: >Processor type: Intel Itanium-based >Number of processors: 64 >Physical RAM => 128GB >OS version: 12.2 Build 1200
A little bit info about task file:>File name: HI2.exe >File... |
Participated as dcua.
## Good Morning (3pt)
The server pretty seem to be decent, but I've wasted a lot of time testing in a local server.
The intended way was to bypass the escape_string() feature, by eating up the escaped character to make one backslash with one quote. (```\\"``` => ```?\"```)
bypassing ```escape_str... |
# Maze3 (Reverse, 400)
In the task description we are given the following info:>Play the game and capture the flag!
A little bit info about task file:>File name: Maze3.exe >File type: Win32 PE Executable >SHA1: a7546206830d0c6ca136598615a25a8232903d7b
Tools used: >Ollydbg 2 with ScyllaHide plugin
Task is again packe... |
# 32C3 CTF 2015 : gurke
**Category:** Misc**Points:** 300**Solves:** 111**Description:**
> Non-standard [gurke](./gurke): <https://32c3ctf.ccc.ac/uploads/gurke> Talk to it via HTTP on <http://136.243.194.43/>.
## Write-up
by [m1ghtym0](https://github.com/m1ghtym0)
"It's not a standard gurke" is quite accurate.First it ... |
## Jit in my pants (reversing, 3 points, 38 solves) Because reversing an obfuscated jit'ed virtual machine for 3 points is fun!
In this task we got an ELF binary. Looking at it's disassembly was really hard - lotsof obfuscated code was put there - I thought that for 3 points we were supposed to usesomething easier.
T... |
###Forensic 100 - uagent`We think we are really cool, are we?`
#ENChallenge gives us a .pcap file. We open it in wireshark, if you analyze first packet, you will see a content of http stream.
Once we open up [rev70.zip](./rev70.zip) we'll see there's a file calle... |
# CODEGATE 2016: JS_is_not_a_jail
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| CODEGATE | JS_is_not_a_jail | Misc. | 100 |
### Description> nc 175.119.158.131 1129
## Write-up
This challenge dropped us into a JavaScript Jail which held a function which we had t... |
# CODEGATE 2016: OldSchool
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| CODEGATE | OldSchool | Pwnable | 490 |
### Description> HackerSchool FTZ Level 20>> nc 175.119.158.131 17171> [http://codegate.bpsec.co.kr/static/files/1502184fbce57b14b4c7193cea5f2d16](cha... |
## unholy (reversing, 4 points, 68 solves) python or ruby? why not both!
In this task we got a Ruby program, refering to shared library unholy.so. The programmixed Ruby and Python code (and native code from the library).
Quick analysis of `main.rb` file showed that the program had a basic structure of typicalkeygenme:... |
# HackIM Crypto 2 - 400pts
>Some one was here, some one had breached the security and had infiltrated here. All the evidences are touched, Logs are altered, records are modified with key as a text from book.The Operation was as smooth as CAESAR had Conquested Gaul. After analysing the evidence we have some extracts of ... |
## rand2 (Web, 2p) ###ENG[PL](#pl-version)
Page uses rand() to generate random numbers.One is printed at the start of the script.Five next is stored and only md5 hash is returned.Flag is displayed after we submit five unknown (for us numbers).
The seed has only 32 bit. Given enough CPU power we can exhaust a lot of thi... |
By running [binary](./randy_noflag) we can see strange symbols at debug info and they actually change every launch>./randy_noflag >>Welcome to Randy's TinyPoker! DebugInfo: g�[>>We've dealt you your hand face down, please enter it:
Ok, let's dive into the binary. We can see that the string changed its from:>Welcome to ... |
## Piapiapia (Web, 6p) ###ENG[PL](#pl-version)
We get a page and its source. It looks like flag is stored inside config.php.All inputs seem pretty well validated but 'nickname' doesn't handle arrays well.Validation is skipped when passed as 'nickname[]='.
SQL injection will be hard, as all backslashes and "unsafe" word... |
Easy,Run ProcHollow1.exe , bp on LoadResourcesave loaded resource as childxxxxx.exe and run ollybp on 00A4215Dthe flag is written as byte sequences00A4215D |. C685 94FEFFFF>MOV BYTE PTR SS:[EBP-16C],41<span>00A42164 |. C685 95FEFFFF>MOV BYTE PTR SS:[EBP-16B],52...--------------or u can nop this call00A422E5 |. ... |
# BKPCTF 2016: des-ofb
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| BKPCTF | des-ofb | Crypto | 2 |
### Description> Decrypt the message, find the flag, and then marvel at how broken everything is. [https://s3.amazonaws.com/bostonkeyparty/2016/e0289aac2e337e21b... |
## ltseorg (crypto, 4 points, 93 solves) make some (charlie)hash collisions!
In this task we were given a code with function hashing strings and were asked to createa hash collision. After reading the algorithm, we quickly noticed that the padding function was non-standard and flawed:```def pad_msg(msg): while not (len... |
Exploit warmup, make rwx memory using mprotect to write shellcode,use mmap() to create only readable memory, read /home/sandbox/flag into it, and call open(), read(), write().The sandbox will try to validate the path using process_vm_readv() but it'll just fail, causing realpath() to fail too and thus bypass the path c... |
## OPM (Misc, 3p) ###ENG[PL](#pl-version)
In this task, we got only an image - so the first step was probably solving a stegano task.Using Stegsolve, we quickly see that least significant bits of all three channels (R,G,B) containsemi-random data on top of the image, and are totally black on the bottom. Extracting data... |
# HackIM RE 2 Pseudorandom - 300pts
>Random as F*!@
## Write-up
This challenge sucked, mostly because I'm rusty at reverse-engineering (not too much of it at $DAYJOB), and I ended up doing a lot of this manually, which I'm sure was way harder than it needed to be.
The first thing I noticed was that it lived up to the c... |
Easy,Run ProcHollow1.exe , bp on LoadResourcesave loaded resource as childxxxxx.exe and run ollybp on 00A4215Dthe flag is written as byte sequences00A4215D |. C685 94FEFFFF>MOV BYTE PTR SS:[EBP-16C],41<span>00A42164 |. C685 95FEFFFF>MOV BYTE PTR SS:[EBP-16B],52...--------------or u can nop this call00A422E5 |. ... |
---title: "Write-up - Sunshine CTF 2016 - Find Floridaman"date: 2016-03-14 00:00:00tags: [Write-up, Sunshine CTF 2016]summary: "Write-up about Sunshine CTF 2016 - Find Floridaman"---
To find the flag of this challenge, we need to look at Florida based newspaper and search in the comments. The hint we have is to... |
Uploaded to https://29a.ch/photo-forensics/. Looking at error level analysis, I see something, and a bit of fiddling with settings gets me the flag.
sun{READY_THE_4CID_M4GNET} |
---title: "Write-up - Sunshine CTF 2016 - Butterfly Effect"date: 2016-03-14 00:00:00tags: [Write-up, Sunshine CTF 2016]summary: "Write-up about Sunshine CTF 2016 - Butterfly Effect"---
After downloading a picture of a beautiful butterfly, we need to find the flag inside the picture. The file is available [here]... |
# misc50 - 'The hidden message'
> My friend really can't remember passwords. > So he uses some kind of obfuscation. > Can you restore the plaintext?
> Attachment: Download [misc50.zip](./misc50.zip)
After opening up misc50.zip we're greeted with these series of 'obfuscated' numbers.
```0000000 126 062 126 163 1... |
#!/usr/bin/env python2
import pwnimport structimport binasciiimport base64import time
local = False#pwn.context(arch='x86_64', os='linux')#shell = pwn.asm(pwn.shellcraft.sh())
def p64(x): return struct.pack(" |
# IWCTF 2016 - Code - A numbers game - 50 pts
> Description: People either love or hate math. Do you love it? Prove it! You just need to solve a bunch of equations without a mistake.>> Service: 188.166.133.53:11027
# Write-up
The service greets us with some equation to solve (Level 1). Surely this won't be the only on... |
#des-ofb
**Category:** Crypto**Points:** 2**Description:**
Decrypt the message, find the flag, and then marvel at how broken everything is.
##Write-upTo start we are provided with two items, a copy of the ciphertext and the following python script.
```pythonfrom Crypto.Cipher import DES
f = open('key.txt', 'r')key_hex ... |
The player is presented with a website that allows deployment of an IRC bot to any IRC channel on Freenode, with the option to provide a channel password. The bot joins the specified channel, and allows the command "!flag", which takes a single argument.<span><span>
< indifferent1625> Before you join the future of IRC,... |
---title: "Write-up - Sunshine CTF 2016 - alligatorsim95"date: 2016-03-14 00:00:00tags: [Write-up, Sunshine CTF 2016]summary: "Write-up about Sunshine CTF 2016 - alligatorsim95"---
In this challenge, we need to connect to a server through Netcat. Let is do it with `nc 4.31.182.242 9000`. A message appears.
```
... |
## Hack By The Sound (Misc, 200p)
A well known blogger has came to a hotel that we had good relationships with its staffs. We tried to capture the sound of his room by placing a microphone inside the desk.
We have recorded the sound about the time that he has typed a text in his blogg. You could find the text h... |
# BCTF 2016: zerodaystore
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| BCTF | zerodaystore | Misc. | 200 |
### Description> [server.py.8c15b34d5e32243f5ed38c1b055bfd6f](challenge)>> [zerodaystore.apk.7869c5b00cdf037273e39572fb1affdb](challenge)
## Write-up
This... |
# BCTF 2016: sif
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| BCTF | sif | Misc. | 350 |
### Description> [sif.fd5d0eb0e7a0fdc2b0a8fad3e0015552](challenge)>> [flag.png.bf845d7e9972c0c05906f8d0eb831ff4](challenge)
## Write-up
This challenge consisted of two file... |
---title: "Write-up - Sunshine CTF 2016 - Dance"date: 2016-03-14 00:00:00tags: [Write-up, Sunshine CTF 2016]summary: "Write-up about Sunshine CTF 2016 - Dance"---
In this challenge, we have a binary file and we need to connect to an IP using Netcat; `nc 4.31.182.242 9001`. We have then the following message:
``... |
## Good Morning (web, 3 points, 110 solves) http://52.86.232.163:32800/ https://s3.amazonaws.com/bostonkeyparty/2016/bffb53340f566aef7c4169d6b74bbe01be56ad18.tgz
In this task we were given a source of web survey. It used MySQL in backend to store our answers. The scriptwas not using prepared statements, so we quickly ... |
```Judges: kablaa
jump on that gator. below file running at
nc 4.31.182.242 9003
flag is in "/home/arr/flag"```
At first the program asks for our name and reads it using `scanf("%9s",&name);`
After that it creates an array with 10 integers, sets them to 0 and asks for index and value 10 times and finally prints the val... |
# Internetwache 2016 : 404 Flag not found (misc80)
**Category:** misc |**Points:** 80 |**Name:** 404 Flag not found |**Solves:** 294 |**Description:**
> I tried to download the flag, but somehow received only 404 errors :(>> Attachment: [misc80.zip](src/misc80.zip)
___
## Write-up
### Part OneUnzipping the package give... |
# Internetwache 2016 : Reversing (90)
**Category:** Reversing |**Points:** 90 |**Name:** The Cube |**Solves:** 240 |**Description:**
> I really like Rubik's Cubes, so I created a challenge for you. I put the flag on the white tiles and scrambled the cube. Once you solved the cube, you'll know my secret.>
___
## Write-u... |
#Insomni'hack CTF 2016 : Smartcat3
##Write-up
This challenge was a little bit tricky but fun.It is based on a website with a form to get the status (Up/Down) of an IP. The source code was avalaible [you can find it here](http://pastebin.com/haAqxW9w)
So, the tricky part was to bypass the `sanity_check` function which p... |
# Quick Run (Misc, 60pts)
---
## Problem
Get the flag ! :)
## Solution
We get text file contains long Base64 strings (see README.txt). Each string is one QR code (27 in total) and every QR code equals one sign in flag.
Using simple Python script I've ripped all QR codes into single file:
```python#!/usr/bin/pythonimpo... |
# hsab
## Solution
The first part of the challenge is to give a proof of work to the server, if the proof of work is correct, we'll get access to a shell. The proof of work is strings which sha256 starts with 20 zeros in binary. The first letters of that string are chosen by the server.
```c#include <string.h>#include ... |
# Internetwache 2016 : A numbers game (50)
**Category:** code |**Points:** 50 |**Name:** A numbers game |**Solves:** 407 |**Description:**
> People either love or hate math. Do you love it? Prove it! You just need to solve a bunch of equations without a mistake.>> Service: 188.166.133.53:11027
___
## Write-up
### Part ... |
Find on: http://www.mypalmbeachpost.com/news/news/crime-law/wendys-alligator-thrower-is-only-fulfilling-his-f...Comment of Summerc137 there is 2 days agoMay the Lord have mercy on this man. That poor woman in the drivethrough! sun{1s_th1s_even_real_l1fe?} |
# Forensics 150: Cat Video
We are given an mp4 video of colorful static. You can see motion in the static as it plays, but it's not clear what it is.
My first thought was to average all of the frames together and see if the shapes were clear, but it didn't work.Another common method of hiding something in an image/vide... |
## des ofb (crypto, 2 points, 189 solves) Decrypt the message, find the flag, and then marvel at how broken everything is.
We were given encryption code and a ciphertext. It used DES cipher in OFB mode. OFB meansthat IV was encrypted using key, its result then encrypted using the key again, then againand so on. Cipher... |
#Insomni'hack CTF 2016 : Robots
##Write-up
###First part :This challenge is about the famous game called [robots](https://en.wikipedia.org/wiki/Robots_%28computer_game%29).Service is running on `robots.insomni.hack:4242`. In the first part of this challenge, you have to won the game in order to get a prompt like this :... |
## Robots (misc)
###ENG[PL](#pl-version)
We get netcat address where we can play a game after connecting.The game was: https://en.wikipedia.org/wiki/Robots_%28computer_game%29The goal of the game was to avoid robots chasing our character and cause them to crash into each other.After winning the game we get the ability ... |
#YACST2
> Captcha is a modern simple Turing test for everyday use, for human> it's simple, but for bot or a simple neural network captcha can become> a hard nut to crack.> > You can try to solve it with your AI too, but it definitely can be> solved with several lines of code, isn’t it?> > [link](http://yacst2.2016.volg... |
#Amazing
> An important step towards the strong AI is the ability of an> artificial agent to solve a well-defined problem. A project by the> name 'amazing' was one of such test problems. It's still up...> > **nc amazing.2016.volgactf.ru 45678**
***Scouting phase***
Use BFS to find all hidden cells reachable from curren... |
## Free Web Access (Web)
###ENG[PL](#pl-version)
In the task we get access to a proxy-gate service.The task description states that this gate is not really anonymous and that it stores some data.However there is no registration nor accounts.There is `/admin` subpage but it says that we're not the admin so we can't acce... |
<html lang="en"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars0.githubusercontent.com"> <link rel="dns-prefetch" href="https://avatars1.githubusercontent.com"> <link rel="dns-prefetch" href="https://avatars2.githubu... |
## RSA? (Crypto, 2p) ###ENG[PL](#pl-version)
We get a ciphertext that seems to be encrypted via RSA from openssl commandline.We also have access to the public key, and therefore we proceed like with standard RSA cipher, by recovering parameters:
`e = 3`
`n = 2329271097867038040364127327000288474706000656804629001191841... |
<html lang="en"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars0.githubusercontent.com"> <link rel="dns-prefetch" href="https://avatars1.githubusercontent.com"> <link rel="dns-prefetch" href="https://avatars2.githubu... |
# Coding90
## Description```We are given an IP address and a port to connect to, upon connecting we are asked to invert the path of some levels.The summary tells us that we have to deal with inverted binary search trees```
## Solution
After many tries trying to understand what the heck was the output. It appeared that ... |
## Image Archeology (Admin, 350)
> We have found the file, which contains a part of gai. But where is it?> Hints> You don't need any special reverse skills to solve this. It will be enough to use strings> to reveal how the flag can be found.
In this task, we received an image of a small disk. After mounting it, we foun... |
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