text_chunk stringlengths 151 703k |
|---|
## Rock with the wired shark! (Misc, 70p)
Sniffing traffic is fun. I saw a wired shark. Isn't that strange? ###ENG[PL](#pl-version)
After extracting objects from given pcap file, we get only a couple of webpages and a zip file.It was encrypted, but we found the password in HTTP basic authorization.
###PL version
Wypak... |
## People's Square (Crypto 6p)
People's Square (A.K.A. shenmhin guangshan in Shanghai Dialect) is a large public square in the Huangpu District of Shanghai, China. We know Talent Yang is the king of People's Square. Now he provides you a strange guessing game, and he also demonstrates his talent by giving you the ... |
A tiny tiny shell script :)English version : https://0x90r00t.com/2016/02/07/sharif-university-ctf-2016-web-250-old-persian-cuneiform-captcha-wri...Version Française : https://0x90r00t.com/fr/2016/02/07/sharif-university-ctf-2016-web-250-old-persian-cuneiform-captcha-... |
# Pwn2Win 2016 Sleeper Cell [Rev - 70]
## ChallengeThe challenge was to reverse a binary (ELF 64-bit) and find the right input.
# SolvingThe first thing I did was to run strings and see what information I could get, for my surprise there was a suspicous strings embedded: **FYM-OI}olte_zi_wdqedd_djrzuj_shgmEDFqo{**
Aft... |
## iMathze (PPC)In this chall we must connect through ssh to the game and solve 3 mazes and 9 equations (3 for each maze).
At first we tried writing a python script to connect, parse the input and send solution, but the game was drawn in a terminal using escape sequences. It would be troublesome to parse them, so we t... |
#!/usr/bin/env python2'''This is not really portable.I had to guess link_map_address on the server (not really complex because of no ASLR).With ASLR (local testing) it works by leaking the address to the link_map in the initial printf vulnerability.The fact that this didn't work on the server indicates that the positio... |
# 32C3 CTF 2015: gurke - Misc 300
> Non-standard [gurke](./gurke.py): <https://32c3ctf.ccc.ac/uploads/gurke> Talk to it via HTTP on <http://136.243.194.43/.>
For this challenge, there is a script running on a server, and we are given the [source](./gurke.py). The server only accepts POST requests, and processes the dat... |
--------------------------------------[Python Exploitation] Secret Accounts - 80 points--------------------------------------
> Through many months of sniffing, we discovered a server running a software which the Club uses to manage information about secret bank accounts abroad. We even obtained its source code. We nee... |
```python# ____ _____ ____ _ _ ____ _____ _____ ___ _ _____ #/ ___|| ____/ ___| | | | _ \| ____| | ___|_ _| | | ____|#\___ \| _|| | | | | | |_) | _| | |_ | || | | _| # ___) | |__| |___| |_| | _ <| |___ | _| | || |___| |___ #|____/|_____\____|\___/|_| \_\_____| |_| |___|_____|_____|# ... |
## Matryoshka (Crackme, 50+100+300+500)
This task was a crackme, which given correct password, spits out the next stage (base64-encoded).Let's start with the first one.
## Stage 1
Running the binary normally, we get the usage information:```$ ./stage1.binUsage: ./stage1.bin <pass>$ ./stage1.bin testTry again...```Hmm, ... |
## Catch Me if You Can (Forensics, 100points) tl;dr concact even and odd data packets and read the flag from the table
Download [usb.pcap](usb.pcap), load it into wireshark. There is some data being sent(I don't know what is actually going on, you can tell me, I'd love to find out :).
`Leftover Captue Data` hold the ra... |
#NDH Quals CTF 2016 : Trololo
**Category:** Forensic **Points:** 100 **Solves:** 83
> Description : A computer belonging to a new company has been infected by a malware. This is a known version of a cryptolocker software, that uses a irc server to received commands. Let's try to grab its password...
##Write-up
We begin... |
------------------------[Steganography] d3lc1d10 - 25 points------------------------
> We found an abandoned file on an old Club’s server. Our informant said it was possible to extract a phone ( XXXX XXXX ) number from it. Get the number and find out the address that he belongs.
> Note: The flag is in this format: CTF-... |
#include <iostream>#include <string>#include <sstream>using namespace std;int main(){<span> string name;</span> cout << "Enter your name: "; getline(cin, name, '\n'); cout << "Hello " << name.data() << " :)" << endl; <span> return 0;</span> ... |
# Break In 2016 - Find The Idiot
**Category:** Forensics**Points:** 100**Solves:** 90**Description:**
> Your friend Bob, is an expert penetration tester. >> He loves solving and creating puzzles. >> He is invited by Pied Diaper Inc. for some testing. >> You join him for this technical expedition. At the site, you watc... |
#Toil33t
We are given a [web interface](http://toil33t.quals.nuitduhack.com) which lets us log in using a username, password, and email. Once we login, we are provided with a cookie such as
```939c4dcbc5c09d3aaa00469fc65bbd6b5d998eabd9fd50d71639ffd19fadaeb23164706a5409b80800d7b98a576d11546cb3b01c5a57390325c7f6a18a4183c... |
## lily.flac (misc, 2 points, 28 solves) more than just a few bleebs ;)
In this task we were given a FLAC file containg a, somewhat weird, music. Looking at itin Audacity, we noticed that there is a very different spectrum in the beginning and end ofthe file - so there was probably some data hidden. We converted the fi... |
We received a invest.pcapng file which contains a schematic, encrypted files and a binary chain. Once the binary chain was passed in the schematic we obtained a password to decrypt with OpenSSL the files. The resulting file is a Word document with the Flag inside. |
The microwave application is used to let your microwave tweets you favorite food.We identified two vulnerabilities in the binary: a string format and a buffer overflow.The string format allowed us to leak the canary and some addresses of the libc. Thosewere then used to exploit the buffer overflow and access the flag. |
We got a pcap, the problem was obvious from the challenge name(heartbleed). Given the RSA-2048 pubkey we sought for prime numbers ofaround 1024 bits in the pcaps, then reconstructed the private key andused it to decrypt the encrypted part of the session, which containedthe flag. |
<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... |
At first I thought this was a DSP problem. It wasn't. The solution was much simpler.
To start, I listened to the entirety of the song. It's not quite everyone's favorite genre, but I rather enjoyed it. I noticed a short burst of static at the beginning. Static typically means data, but I figured I'd look for other pat... |
1. create 3 unit
2. free #2
3. free #1
4. create unit with name length 24 will overwrite one byte of freed heap chunk size
5, create 2 unit will overwrite last unit's vtable |
# Code90 - Dark Forest
## 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 and find out of the forest? Hint: It's about (inverted) BSTs. Don't forget the spaces.
## ... |
## Android (Reverse, 100p)
> Find the Flag!!> [Download](Sharif_CTF.apk)
###ENG[PL](#pl-version)
We download android application given to us by challenge creators.First think we do is packing it into java decompiler (http://www.javadecompilers.com/apk).
Most of code is boring and uninteresting, but one of functions is... |
## zerodaystore (misc, 200) tldr; Add &price=0 to the end of the /pay request
[server.py](server.py.8c15b34d5e32243f5ed38c1b055bfd6f)[zerodaystore.apk](zerodaystore.apk.7869c5b00cdf037273e39572fb1affdb)
We start off by decompiling the apk file using [javadecompilers](http://www.javadecompilers.com/apk). The code is pre... |
# misc70 - 'Rock with the wired shark'
> Sniffing traffic is fun. > I saw a wired shark. Isn't that strange?
> Attachment: [misc70.zip](./misc70.zip)
After opening up misc70.zip we're greeted with **dump.pcapng**, a dump of sniffed traffic to be opened in Wireshark (who would've guessed from the challenge name~)
... |
### Solved by superkojiman
This binary uses fgets() to receive 32 bytes of input from the user, and later on, uses strcpy() to copy that input to another buffer. We can't overflow the buffer unless we send "I"s in our input. This is because a replace() function converts "I"s into "you"s, and 21 "I"s converted to "you"s... |
### Solved by superkojiman
This is a 60 point reversing challenge. We're given a jar file called Secure_Text_Saver.jar. I uploaded it to [http://www.javadecompilers.com/](http://www.javadecompilers.com/) and found that LoginPage.java contained hardcoded credentials in the main() function:
```java public static void ... |
### Solved by superkojiman and Swappage
On to pwn2! This binary was changed at some point during the competition. Initially there was a function that had a `syscall` instruction. Unfortunately this didn't work on 32-bit binaries, so the solution we came up with worked around it. After the binary was updated, the `sysca... |
#Vertinet
This problem follows the same specifications as the previous Verticode problem, except that you have to solve many of them by developing a client to communicate with the server available at problems1.2016q1.sctf.io:50000. Good luck.
**The solution relys on Verticode, so for more information see that writeup**... |
#Lengthy Lingo
Can you crack the code? We intercepted this flag but can't seem to figure out how it was encrypted.
**Hint:** *The numbers don't seem to follow a specific pattern...*
## Solution overview
We get a file **encrypted.dat** which contain the cipher text that we need to decode, it contain a lot what seems to ... |
CTF Challenges Link: https://quals.nuitduhack.com/challenges/if you need some informations or more details: Contact Me : [email protected]if you like this video: #Like + #Subscribe + #Share & Thank you ^^ !! |
----------------[Forensics] Dump - 50 points----------------
> English:
> We know this dump was generated by a process which was executing as root in the computer, and that it was reading directly from a /dev device. Probably it is part of a keylogger module included in a rootkit which is being tested by the Club. Help... |
PCAPBleedingAuthor : julien - Difficulty : mediumFinally, somebody has read our 2014 log files. We think an attack occurred on our HTTPS server but we don't know if they succeed in stealing valuableinformation. Some confidential data pass through this SSL channels so we hope it's not broken :~The flag format is INS={so... |
#Control Panel
Take control... of the flag on this [admin control panel](http://cpanel.sctf.michaelz.xyz/).
**Hint:** *There are more hints in the comments.*
## Getting an overview
We go to the site and browse about a bit, to see what we are dealing with. We got
1) The main page2) Register / sign up page3) Login page4)... |
<h1>angstromCTF 2016 - SPQR</h1><h2>Category: Crypto Score: 10</h2>DescriptionWe found this message written on a piece of parchment in the ruins of ancient Rome. What could it mean?uxptkx_max_bwxl_hy_ftkvaSolving the challengeThis is just a basic substitution cipher.To find the offset I used http://rumkin.com/tools/cip... |
## Challenge
We are given a page with a paramter ?xss=<xss> in which we must find an XSS which can bypass the filters.
## Solution
After some experimenting we find that certain characters such as ["<", ">", ":"] are replaced by "_". These characters could not be escaped by the usual tricks like converting to hex ([exam... |
<h1>angstromCTF 2016 - What the Hex</h1>Category: Crypto Score: 15<h2>Description</h2><span>Decode using hex and see what you get…6236343a20615735305a584a755a58526659323975646d567963326c76626c3930623239736331397962324e72</span><h2>Solving the challenge</h2>Only needed my terminal for this.<span>First I decoded the hex ... |
<h1>angstromCTF 2016 - Amoebananas!</h1>Category: Web Score: 20<h2>Description</h2>The amoeba is a fascinating creature.<h2>Solving the challenge</h2><span>Looking at the page’s source code with ctrl-u revealed the flag</span><span><html> <head> <title>Amoeba Central</title> </head>
<body> <h1 s... |
### Solved by Swappage & Superkojiman
# analysis
pwn3 was a binary *blogging application* for linux x86
pwn3: ELF 32-bit LSB executable, Intel 80386, version 1 (GNU/Linux), statically linked, for GNU/Linux 2.6.24, BuildID[sha1]=4838e54f549c6c8d9e49fc91153fe41060dbfbe5, not stripped
when running the application prov... |
#Trololo
Filter out all packets with the protocol RTP/RTSP/RTCP using the Wireshark filter `!rtp && !rtsp && !rtcp`. These are for some video stream that is not relevant to the malware.
One of the remaining packets is a response for a GET request for `/content.enc`. The content of this packet seems to contain "encrypt... |
<h1>angstromCTF 2016 - SuperSecure™</h1>Category: Web Score: 30<h2>Description</h2>Jason made a new SuperSecure™ website, but lost his password. It’s displayed on the admin page. Can you login?<h2>Solving the challenge</h2><span>This challenge uses client side validation, which makes life very easy for us.</span><span>... |
# Plaid CTF 2016: rabit
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| Plaid CTF | rabit | Crypto | 175 |
### Description> Just [give me a bit](challenge), the least significant's enough. Just a second we’re not broken, just very, very insecure. Running at rabit.... |
<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... |
## Rabit (Crypto, 175 points, 71 solves)
Just give me a bit, the least significant's enough. Just a second we’re not broken, just very, very insecure. Running at rabit.pwning.xxx:7763
###ENG[PL](#pl-version)
We get the [server files](server) so we can analyse the cryptosystem.It turns out that the flag is encrypted w... |
<h1>angstromCTF 2016 - Artifact</h1>Category: Crypto Score: 20<h2>Description</h2>While exploring ancient ruins, a strange message was found. Can you crack the message?<h2>Solving the challenge</h2>Encrypted message:<span>"gxipzhx qs kpz ravv mbgp gxs jmgk pe lps:gxipzhx qs kpz ravv mbgp sgsibac ramb:gxipzhx qs aqpbh g... |
#plane_site
As the name of the problem suggests, the flag is hidden in one of the RGB planes of the image. In this instance it was hidden in the red plane. We can extract the flag using Mathematica:
```Binarize[ColorNegate[ColorSeparate[<image>][[1]]], 0]```
which yields:
](challenge) was totally secure. But then we came across this web... |
<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... |
#the stuff
We are given a pcap with a lot of Bing searches about why cilantro tastes like soap. Opening the stream in Wireshark, we notice that there are some SMTP packets at the top, one of which mentions "the stuff".
If we right-click on an SMTP packet and click "Follow TCP Stream" we can read the entire email:
```22... |
#Ducks
##[The ducks](http://ducks.sctf.michaelz.xyz/) and I have a unfinished score to settle.
Hint: If you've remember HSF, you'll know that The Ducks is unsolvable.
This one was quite easy: since it gave us the [source code of the page](http://ducks.sctf.michaelz.xyz/source.php) we could see that it uses the [PHP ext... |
# A...mazeing (Network / PPC, 200) (16 solvers) Hi!. let's play old nes game. I just plugged this stuff to tcp ports for ya ... IP: amazeing.hackable.software
In this task we were told that there is a service runnning a gameand several TCP ports represent pressing various buttons on SNEScontroller... |
# LenghtyLingo## Description:Can you crack the code? We intercepted this flag but can't seem to figure out how it was encrypted.
The solution is quite simple. You have to count the length of each word, then convert it's number to ascii.I've came up with this one-liner:
``sed 's/, /\n/g' encrypted.dat | while read i; do... |
# morset (Misc, 50pts, 86 solves) A mysterious signal… can you decode it? Running at morset.pwning.xxx:11821
In this task we were told to conenct to certain server. The server sent us somedots and dashes, so we immediately thought it could be Morse code. Decoding it, though,gave us some gibberish alfanumeric string. T... |
# the stuff (Misc, 50pts, 219 solves) Can you believe Ryan uses Bing?
The pcap file we got, contained a mail exchange. In one of the mails, there wasa password, and the other one contained an attached zip file. Opening it usingpassword we had, gave us flag.
 |
<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... |
# Untitled-1.pdf (Misc, 50pts, 286 solves) This PDF has a flag on it, but I can't find it... can you?
In this task we were given a pdf file. Running `pdftotext untitled.pdf` gave us flag. |
# Vertinet
This problem follows the same specifications as the previous [Verticode](https://github.com/n00bsb/sctf/tree/master/2016q1/Verticode), except that you have to solve many of them by developing a client to communicate with the server available at `problems1.2016q1.sctf.io:50000`. Good luck.
# client.sh## Runni... |
#Rain Or Shine
This one we couldn't crack in time, mostly because I first found a JPEG signature which turned out to be just the thumbnail of the original image, what cost us a lot of time, and also because GIMP wouldn't open layered TIFFs.
Because of this, we spent a lot of time trying to manually reassemble the QR C... |
# VerticodeWelcome to Verticode, the new method of translating text into vertical codes.
Each verticode has two parts: the color shift and the code.
The code takes the inputted character and translates it into an ASCII code, and then into binary, then puts that into an image in which each black pixel represents a 1 and... |
# IWCTF 2016 - Code - A numbers game II - 70 pts
> 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](code70.zip)>> Service: 188.166.133.53:11071
# Write-up
Another equation solver challenge, but th... |
# tonnerreThere are two phases to this problem: a SQL injection to recover some data, and an attack on [SRPv1](https://en.wikipedia.org/wiki/Secure_Remote_Password_protocol) that relies on the recovered data.
## SQL InjectionWe are given a [website](http://tonnerre.pwning.xxx:8560/) with a username and password login f... |
butterfly=========
This challenge was a "pwnable" worth 150 points:
> Sometimes the universe smiles upon you. And sometimes, well, you just have to roll your sleeves up and do [things yourself](https://github.com/burlingpwn/Writeups/raw/butterfly/PlaidCTF-2016/butterfly/butterfly_33e86bcc2f0a21d57970dc6907867bed). Run... |
<h1>angstromCTF 2016 - Java is the Best</h1>Category: Reversing Score: 50<h2>Description</h2>What kind of input makes this program happy?<h2>Solving the challenge</h2><span>I decompiled the .class file with jad</span># jad SuperSecure.class Parsing SuperSecure.class...The class file version is 51.0 (only 45.3, 46.0 an... |
## Musical Penguins - 45 (Forensics)#### Writeup by cabrodyCreated: 4-18-16
### ProblemThis file is a complete mystery to me, I've never seen notes like these!
### HintMorgan Freeman and Kevin Spacey would have fun with this one!
## AnswerAfter researching the file type that the given file was, I downloaded the require... |
# unix_time_formatter### Pwnable (76 pts)
```Converting Unix time to a date is hard, so Mary wrote a tool to do so.
Can you you exploit it to get a shell? Running at unix.pwning.xxx:9999```
Writeup by: [mut3](https://github.com/mut3)
Collaborators: [brianmwaters](https://github.com/brianmwaters), [dillonb](https://gith... |
# SQL
> Our [website](http://ctf.sharif.edu:36455/chal/sql/) executes your PostgreSQL queries. And flags are nicely formatted.
## Task
You can run SQL queries with some limitations. For each request, you must provide a proof-of-work, namely pow, which can satisfy this expression: `substr(sha1($pow . $nonce), 0, 5) === ... |
### Misc 80 - Flag not found`I tried to download the flag, but somehow received only 404 errors :(`
#ENWe have flag.pcapng file containing dns request and response packets along with HTTP get request to /flag.zip.If we analyze .pcapng file, following points are found.- DNS queries for A record- DNS queries for AAAA rec... |
```dmail420
dmail is dealermail, its super secret email for only the top dealers
Host is ubuntu 14.04
107.170.17.158 4201```
This challenge has both PIE and ASLR enabled. The program has 3 options. We can write mail, read mail and delete mail. At first mallocs a 256bytes for putting the addresses of the mails. After th... |
```postboard420
I made a post on this new forum, but the memes were so dank that the admin disabled it! I managed to get my hands on a broken binary for the server, can you figure out how to pwn it and retrieve my memes?
46.101.248.243 1337
NOTE: if you are getting server 500 errors, clear your cookies```
By searching ... |
Looking at the information we've been given, it appears that this is an ECDSA repeated-nonce problem. We have an unspecified signature algorithm used to produce 512-bit signatures and a 256-bit public key. Additionally, the two signatures have identical first halves: 68299a51b6b592e2db83c26ca3594bdd81bdbb9f11c597a1deb8... |
#[Failed Compression](https://ctftime.org/task/2258)
This one was a pain in the *ss. I opened the file (compressed.zip, 73mb) and found a lot of JPEG JFIF broken headers, and also PNG IHDR ones.
I was REALLY bored to code something nice to extract all the files, so I thought I could use some luck this time. Then I focu... |
# angstromCTF 2016 : what-the-hex-15
**Category:** Crypto**Points:****Solves:****Description:**
> Decode using hex and see what you get...>> 6236343a20615735305a584a755a58526659323975646d567963326c76626c3930623239736331397962324e7
## Write-up
(TODO)
## Other write-ups and resources
* [D3siprox](https://ctftime.org/writ... |
Like all the other "... is hard" problems in past PlaidCTF this one is about CVE-2015-3193.<span>OpenSSL 1.0.2 versions before 1.0.2e on x86_64 contain a bug in the function BN_mod_exp() and sometimes it produces wrong results. So, the solution is here:https://github.com/hannob/bignum-fuzz/blob/master/CVE-2015-3193-ope... |
# SharifCTF 2016: Kick Tort Teen
## Challenge details| Event | Challenge | Category | Points ||:------|:----------|:---------|-------:|| SharifCTF | Kick Tort Teen | Forensics | 50 |
### Description> Anagram, anyone?>> [Download](challenge/data.xls)
## Write-upThe challenge gives us an *Excel* spreadsheet ([data.xls](c... |
#Ducks
##[The ducks](http://ducks.sctf.michaelz.xyz/) and I have a unfinished score to settle.
**Hint:** *If you've remember HSF, you'll know that The Ducks is unsolvable.*
Viewing the source code of this challenge, we appear to have some awkward use of extract...
```
<div class="alert aler... |
We Can Open The Pcap File Using Wireshark And Follow The TELNET Protocol To Get Flag :Flag : https://github.com/MrMugiwara/WriteupsCTF/blob/master/ufoCTF2016/Find_Me/flag.pngSource : https://github.com/MrMugiwara/WriteupsCTF/tree/master/ufoCTF2016/Find_Me |
xenocryst - 420 points======================
This challenge required you to reverse engineer a virtual machine that ran aslightly modified [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck)interpreter, then generate "shellcode" for this VM.
A quick top-down look at the binary in IDA shows this: The code allocates ame... |
## Xorpainter (Misc, 4p) you need a BIG screen to solve this problem ###ENG[PL](#pl-version)
317MB CSV file is provided. Each row contains 4 numbers.It looks like first pair is always smaller than the second pair.This suggests the numbers represent rectangles.Name of the file suggests we should paint them in xor mode... |
tl;dr: Extract MS Paint display buffer from a VM memory dump.
# Challenge"Find the flag" in a provided `dump1.raw.lzma` file.
# Identify Provided MaterialsUpon examination, `dump1.raw` was found to be an ELF executable containing the magic codes `VBCORE` and `VBCPU`. Clearly, this is a core dump of a VirtualBox instanc... |
# BCTF 2016 : catvideo (150)
**Category:** forensics |**Points:** 150 |**Name:** catvideo |**Solves:** 135 |**Description:**
> cat_video.mp4 Google Drive> > cat_video.mp4 pan.baidu.com> > cat_video.mp4 Dropbox> > cat_video.mp4 MEGA
___
## Write-up
### Part OneOpening the mp4 we get this splash of colors, and squinting ... |
## Spotted Quoll Web 50
# Problem
This blog on Zombie research looks like it might be interesting - can you break into the /admin section?
# Solution
We get web page with quite simple interface:
We have no access to _Admin_
Quick look at request headers shows Cookie header contains long B... |
# Forced Puns
Let's do a `file` as a first thing:```bash$ file ./app/forced-puns./app/forced-puns: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 3.7.0, BuildID[sha1]=a677e5ead33f8ac9d3948e8157cdcfa39b3f9701, not stripped```
Aarch64, never seen its ass... |
# Ernst Echidna (Web, 50pts)
## Problem
Can you hack (url provided) website? The robots.txt sure looks interesting.
## Solution
We've got simple web page, which allows us to register an account:
Register form:
_robots.txt_ reveals one hidden path:
```Disallo... |
## For2 (Forensics, 200 points) tl;dr plot mouse movements from pcap
The given [pcap file](capture.pcap) contains usb mouse traffic, knowing that certain bytes in LeftoverCaptureData contain relative mouse movement, we can easily export the needed data and plot the movements: [plotMouse.py](plotMouse.py)
After running... |
Add a MX record for your domain : ctfcompetition.com.yourdomain<span>Listening on SMTP portSign up a Google account with email </span>ctfcompetition.com@ctfcompetition.com.yourdomainAnd sign in the website to get the flag |
# Writeup for Death Sequence (Algorithms 100)
This challenge was about following sequence:> 1, 1, 1, 1, 10, 46, 217, 1027, 4861, 23005, ...
Our task was to determine last 9 digits of nth element of the sequence and last 9 digits of sum of n first elements.The main difficulty of this task was that n could be even 10^18.... |
---title: "Write-up - Sunshine CTF 2016 - Randy"date: 2016-03-14 00:00:00tags: [Write-up, Sunshine CTF 2016]summary: "Write-up about Sunshine CTF 2016 - Randy"---
In this challenge, we have a binary file and we need to connect over the network using Netcat. After a program analysis on the binary file, we can se... |
https://github.com/Blystad/googlectf_writeups/tree/master/networking/opabina_regalis_redirectWhen we get the 401 Unauthorized reply from the server, instead of forwarding that, we modify it to a 302 REDIRECT, add aLocation header pointing to /protected/secret, send a few messages back and forth until finally we get the... |
# Jekyll solution
## TL;DR;Jekyll gives you a hashing function and you're prompted to find a value that hashed with two different seeds gives you two different predefined values.The round function behind the hash is reversible and the "digest" of the hash function is one of the 3 internal states of the round function.B... |
## boomshakalaka (mobile, 3 points) play the game, get the highest score
[boomshakalaka](plane.apk)
We're given an android apk, after decompiling it, we learned that our flag is stored in Cocos2dxPrefsFile.xml in shared_prefs folder.When we looked in the specified file, it turned out that the flag is only partially com... |
# Ill Intentions
*Solved by @\_pox\_ and @cogitoergor00t*
We have a file called **illintentions.apk**
Let's decompile it
```apktool d illintenions.apk```
Ok, so now we have the smali code and some useful informations in *AndroidManifest.xml*
Let's have a look
```cat AndroidManifest.xml```
Interesting, we have 4 Activit... |
import randomimport sslimport urllib2import urllibimport reimport click
class SecurePrng(object): p = 4646704883L
def __init__(self, x, y): # generate seed with 64 bits of entropy self.x = x self.y = y
def next(self): self.x = (2 * self.x + 3) % self.p self.y = (3 * self.y ... |
# Audio visual receiver
I worked on this challenge with @hanyone and @castor91, but at the end @rpalearisolved it with the old but gold (smart) brute force.
The program is very simple: it has 6 functions named `up`, `down`, `left`,`right`, `a`, `b` that change in some ways a global `state` variable and a`check` one. Mo... |
## Frog Fractions 2(reversing, 5 points, 65 solves) Turns out Frog Fractions 2 is not battletoadsWe're given a 64bit elf file, let's start by disassembling it and describing important points in the program.
The program uses a library called libgmp to handle big numbers, it makes the debugging less friendly.
After anal... |
We are presented with a public key, a mechanism for getting some sort of token which we are told is some bit of data (presumably the flag) encrypted using the private key corresponding to the provided public key using RSA with PKCS#1_v1.5 padding. We are also provided with a mechanism to check if the token is correct. ... |
Running foremost picks up a zip folder.
foremost -o moon.out moon.png
The zip has a flag.txt and is password protected. After failing to find a password, I tried "moon". What do you know.
Flag.txt has sun{0kay_it_is_a_m00n}. |
<span>Solution : Crypto1.txt 100 Pts <span></span> https://41.231.22.176:1231/1/crypto1.txt qv, sgytx :U !! acg scw xyg udtum nfd !!! htpn'l kigof. nin hvusdky mlv usodhw trth : Maug xltwzv bal , zv'g zdn mlv uoyt weyv twswn, bx'j c zuce, ... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.