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About A raccoon is a tool made for reconnaissance and information gathering with an emphasis on simplicity. It will do everything from fetching DNS records, retrieving WHOIS information, obtaining TLS data, detecting WAF presence and up to threaded dir busting and subdomain enumeration. Every scan outputs to a corresponding file. As most of Raccoon's scans are independent and do not rely on each other's results, it utilizes Python's asyncio to run most scans asynchronously. Raccoon supports Tor/proxy for anonymous routing. It uses default wordlists (for URL fuzzing and subdomain discovery) from the amazing SecLists repository but different lists can be passed as arguments. For more options - see "Usage".
Installation For the latest stable version:
pip install raccoon-scanner
Or clone the GitHub repository for the latest features and changes:
git clone https://github.com/evyatarmeged/Raccoon.git cd Raccoon python raccoon_src/main.py
Prerequisites Raccoon uses Nmap to scan ports as well as utilizes some other Nmap scripts and features. It is mandatory that you have it installed before running Raccoon. OpenSSL is also used for TLS/SSL scans and should be installed as well. Usage
Usage: raccoon [OPTIONS]
Options: --version Show the version and exit. -t, --target TEXT Target to scan [required] -d, --dns-records TEXT Comma separated DNS records to query. Defaults to: A,MX,NS,CNAME,SOA,TXT --tor-routing Route HTTP traffic through Tor (uses port 9050). Slows total runtime significantly --proxy-list TEXT Path to proxy list file that would be used for routing HTTP traffic. A proxy from the list will be chosen at random for each request. Slows total runtime --proxy TEXT Proxy address to route HTTP traffic through. Slows total runtime -w, --wordlist TEXT Path to wordlist that would be used for URL fuzzing -T, --threads INTEGER Number of threads to use for URL Fuzzing/Subdomain enumeration. Default: 25 --ignored-response-codes TEXT Comma separated list of HTTP status code to ignore for fuzzing. Defaults to: 302,400,401,402,403,404,503,504 --subdomain-list TEXT Path to subdomain list file that would be used for enumeration -S, --scripts Run Nmap scan with -sC flag -s, --services Run Nmap scan with -sV flag -f, --full-scan Run Nmap scan with both -sV and -sC -p, --port TEXT Use this port range for Nmap scan instead of the default --tls-port INTEGER Use this port for TLS queries. Default: 443 --skip-health-check Do not test for target host availability -fr, --follow-redirects Follow redirects when fuzzing. Default: True --no-url-fuzzing Do not fuzz URLs --no-sub-enum Do not bruteforce subdomains -q, --quiet Do not output to stdout -o, --outdir TEXT Directory destination for scan output --help Show this message and exit.
In this blog series we will analyze blockchain vulnerabilities and exploit them ourselves in various lab and development environments. If you would like to stay up to date on new posts follow and subscribe to the following: Twitter: @ficti0n
As of late I have been un-naturally obsessed with blockchains and crypto currency. With that obsession comes the normal curiosity of "How do I hack this and steal all the monies?"
However, as usual I could not find any actual walk thorough or solid examples of actually exploiting real code live. Just theory and half way explained examples.
That question with labs is exactly what we are going to cover in this series, starting with the topic title above of Re-Entrancy attacks which allow an attacker to siphon out all of the money held within a smart contract, far beyond that of their own contribution to the contract.
This will be a lab based series and I will show you how to use demo the code within various test environments and local environments in order to perform and re-create each attacks for yourself.
Note: As usual this is live ongoing research and info will be released as it is coded and exploited.
If you are bored of reading already and just want to watch videos for this info or are only here for the demos and labs check out the first set of videos in the series at the link below and skip to the relevant parts for you, otherwise lets get into it:
Background Info:
This is a bit of a harder topic to write about considering most of my audience are hackers not Ethereum developers or blockchain architects. So you may not know what a smart contract is nor how it is situated within the blockchain development model. So I am going to cover a little bit of context to help with understanding.I will cover the bare minimum needed as an attacker.
A Standard Application Model:
In client server we generally have the following:
Front End - what the user sees (HTML Etc)
Server Side - code that handles business logic
Back End - Your database for example MySQL
A Decentralized Application Model:
Now with a Decentralized applications (DAPP) on the blockchain you have similar front end server side technology however
Smart contracts are your access into the blockchain.
Your smart contract is kind of like an API
Essentially DAPPs are Ethereum enabled applications using smart contracts as an API to the blockchain data ledger
DAPPs can be banking applications, wallets, video games etc.
A blockchain is a trust-less peer to peer decentralized database or ledger
The back-end is distributed across thousands of nodes in its entirety on each node. Meaning every single node has a Full "database" of information called a ledger.The second difference is that this ledger is immutable, meaning once data goes in, data cannot be changed. This will come into play later in this discussion about smart contracts.
Consensus:
The blockchain of these decentralized ledgers is synchronized by a consensus mechanism you may be familiar with called "mining" or more accurately, proof of work or optionally Proof of stake.
Proof of stake is simply staking large sums of coins which are at risk of loss if one were to perform a malicious action while helping to perform consensus of data.
Much like proof of stake, proof of work(mining) validates hashing calculations to come to a consensus but instead of loss of coins there is a loss of energy, which costs money, without reward if malicious actions were to take place.
Each block contains transactions from the transaction pool combined with a nonce that meets the difficulty requirements.Once a block is found and accepted it places them on the blockchain in which more then half of the network must reach a consensus on.
The point is that no central authority controls the nodes or can shut them down. Instead there is consensus from all nodes using either proof of work or proof of stake. They are spread across the whole world leaving a single centralized jurisdiction as an impossibility.
Things to Note:
First Note: Immutability
So, the thing to note is that our smart contracts are located on the blockchain
And the blockchain is immutable
This means an Agile development model is not going to work once a contract is deployed.
This means that updates to contracts is next to impossible
All you can really do is createa kill-switch or fail safe functions to disable and execute some actions if something goes wrong before going permanently dormant.
If you don't include a kill switch the contract is open and available and you can't remove it
Second Note:Code Is Open Source
Smart Contracts are generally open source
Which means people like ourselves are manually bug hunting smart contracts and running static analysis tools against smart contract code looking for bugs.
When issues are found the only course of action is:
Kill the current contract which stays on the blockchain
Then deploy a whole new version.
If there is no killSwitch the contract will be available forever.
Now I know what you're thinking, these things are ripe for exploitation.
And you would be correct based on the 3rd note
Third Note: Security in the development process is lacking
Many contracts and projects do not even think about and SDLC.
They rarely add penetration testing and vulnerability testing in the development stages if at all
At best there is a bug bounty before the release of their main-nets
Which usually get hacked to hell and delayed because of it.
Things are getting better but they are still behind the curve, as the technology is new and blockchain mostly developers and marketers.Not hackers or security testers.
Forth Note:Potential Data Exposure via Future Broken Crypto
If sensitive data is placed on the blockchain it is there forever
Which means that if a cryptographic algorithm is broken anything which is encrypted with that algorithm is now accessible
We all know that algorithms are eventually broken!
So its always advisable to keep sensitive data hashed for integrity on the blockchain but not actually stored on the blockchain directly
Exploitation of Re-Entrancy Vulnerabilities:
With a bit of the background out of the way let's get into the first attack in this series.
Re-Entrancy attacks allow an attacker to create a re-cursive loop within a contract by having the contract call the target function rather than a single request from auser. Instead the request comes from the attackers contract which does not let the target contracts execution complete until the tasks intended by the attacker are complete. Usually this task will be draining the money out of the contract until all of the money for every user is in the attackers account.
Example Scenario:
Let's say that you are using a bank and you have deposited 100 dollars into your bank account.Now when you withdraw your money from your bank account the bank account first sends you 100 dollars before updating your account balance.
Well what if when you received your 100 dollars, it was sent to malicious code that called the withdraw function again not lettingthe initial target deduct your balance ?
With this scenario you could then request 100 dollars, then request 100 again and you now have 200 dollars sent to you from the bank. But 50% of that money is not yours. It's from the whole collection of money that the bank is tasked to maintain for its accounts.
Ok that's pretty cool, but what if that was in a re-cursive loop that did not BREAK until all accounts at the bank were empty?
That is Re-Entrancy in a nutshell.So let's look at some code.
Example Target Code:
function withdraw(uint withdrawAmount) public returns (uint) {
Line 1: Checks that you are only withdrawing the amount you have in your account or sends back an error.
Line 2: Sends your requested amount to the address the requested that withdrawal.
Line 3: Deducts the amount you withdrew from your account from your total balance.
Line 4. Simply returns your current balance.
Ok this all seems logical.. however the issue is in Line 2 - Line 3.The balance is being sent back to you before the balance is deducted. So if you were to call this from a piece of code which just accepts anything which is sent to it, but then re-calls the withdraw function you have a problem as it never gets to Line 3 which deducts the balance from your total. This means that Line 1 will always have enough money to keep withdrawing.
Let's take a look at how we would do that:
Example Attacking Code:
function attack() public payable {
1.bankAddress.withdraw(amount);
}
2.function () public payable {
3.if (address(bankAddress).balance >= amount) {
4.bankAddress.withdraw(amount);
}
}
Line 1: This function is calling the banks withdraw function with an amount less than the total in your account
Line 2: This second function is something called a fallback function. This function is used to accept payments that come into the contract when no function is specified. You will notice this function does not have a name but is set to payable.
Line 3:This line is checking that the target accounts balance is greater than the amount being withdrawn.
Line 4:Then again calling the withdraw function to continue the loop which will in turn be sent back to the fallback function and repeat lines over and over until the target contracts balance is less than the amount being requested.
Review the diagram above which shows the code paths between the target and attacking code. During this whole process the first code example from the withdraw function is only ever getting to lines 1-2 until the bank is drained of money. It never actually deducts your requested amount until the end when the full contract balance is lower then your withdraw amount. At this point it's too late and there is no money left in the contract.
Setting up a Lab Environment and coding your Attack:
Hopefully that all made sense. If you watch the videos associated with this blog you will see it all in action.We will now analyze code of a simple smart contract banking application. We will interface with this contract via our own smart contract we code manually and turn into an exploit to take advantage of the vulnerability.
Then lets open up an online ethereum development platform at the following link where we will begin analyzing and exploiting smart contracts in real time in the video below:
Coding your Exploit and Interfacing with a Contract Programmatically:
The rest of this blog will continue in the video below where we will manually code an interface to a full smart contract and write an exploit to take advantage of a Re-Entrency Vulnerability:
Conclusion:
In this smart contract exploit writing intro we showed a vulnerability that allowed for re entry to a contract in a recursive loop. We then manually created an exploit to take advantage of the vulnerability. This is just the beginning, as this series progresses you will see other types of vulnerabilities and have the ability to code and exploit them yourself. On this journey through the decentralized world you will learn how to code and craft exploits in solidity using various development environments and test nets.
What is BurpSuite? Burp Suite is a Java based Web Penetration Testing framework. It has become an industry standard suite of tools used by information security professionals. Burp Suite helps you identify vulnerabilities and verify attack vectors that are affecting web applications. Because of its popularity and breadth as well as depth of features, we have created this useful page as a collection of Burp Suite knowledge and information.
In its simplest form, Burp Suite can be classified as an Interception Proxy. While browsing their target application, a penetration tester can configure their internet browser to route traffic through the Burp Suite proxy server. Burp Suite then acts as a (sort of) Man In The Middle by capturing and analyzing each request to and from the target web application so that they can be analyzed.
Everyone has their favorite security tools, but when it comes to mobile and web applications I've always found myself looking BurpSuite . It always seems to have everything I need and for folks just getting started with web application testing it can be a challenge putting all of the pieces together. I'm just going to go through the installation to paint a good picture of how to get it up quickly.
BurpSuite is freely available with everything you need to get started and when you're ready to cut the leash, the professional version has some handy tools that can make the whole process a little bit easier. I'll also go through how to install FoxyProxy which makes it much easier to change your proxy setup, but we'll get into that a little later.
Requirements and assumptions:
Mozilla Firefox 3.1 or Later Knowledge of Firefox Add-ons and installation The Java Runtime Environment installed
Download BurpSuite from http://portswigger.net/burp/download.htmland make a note of where you save it.
on for Firefox from https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-standard/
If this is your first time running the JAR file, it may take a minute or two to load, so be patient and wait.
Video for setup and installation.
You need to install compatible version of java , So that you can run BurpSuite.
How To Recover Files That Are Deleted From Recycle Bin
How To Recover Files That Are Deleted From Recycle Bin
Well, Windows users have a bad habit of removing files from recycle bin. Deleting useless files from Recycle Bin helps a user to save some storage space which can improve the speed of a computer. However, Windows users do that more frequently and later regret. Actually, Recycle Bin is a place from where we can get back our deleted files and folders.
Sometimes, we accidentally delete our important files and folders and due to some reason we lose them from Recycle bin too! At that time, we search for recovery methods. Well, there are many methods available over the web which can help you to recover deleted files from computer, but, when it comes to reliability, nothing can beat EaseUS.
What Is EaseUS Data Recovery Wizard?
EaseUS is one of the leading software providers which is known for its data recovery programme. EaseUS offers some free data recovery software that can help you to recover deleted, formatted or lost data from PC, laptop or removable device easily and quickly.
One of the best thing about EaseUS is that it provides tools for recycle bin recovery which can help you to get back files that you have deleted from the Recycle bin itself. EaseUS Data Recovery Wizard free can easily recover lost files, pictures, documents, videos and more from deleting, formatting, partition loss, OS crash, virus attack and other data loss cases.
How To Recover Deleted Files?
If you are struggling to get back your lost data files, then here is an easy data recovery method which will help you to get back deleted files on your computer. Below, we are going to share a mini guide on how to use EaseUS Recycle Bin Recovery to get back your deleted data.
Step 1. First of all, you need to download and install EaseUS Data Recovery Wizard on your Windows computer and then launch it normally. You need to select the location where you want to scan and then click on 'Scan'
Step 2. Now, wait for few minutes until the tool finishes scanning your drive. The tool search for files that got deleted or cleaned from the Recycle Bin.
Step 3. Now it will show you files that you can recover. Here you need to click on the file which you want to recover and click on 'Recover'
That's it, you are done! This is how you can use EaseUS data recovery to get back your deleted files on your computer.
Benefits of EaseUS Data Recovery
Well, the data recovery tool provided by EaseUS comes with many benefits. It can not only recover accidentally deleted files, but it can also recover data in case of Virus Attacks, Hard Disk Damage, OS Crash etc.
You can also use this awesome data recovery wizard to recover deleted files from External Disk, USB Drive, Camcorder, Mobile Devices, Zip Drive, iPod, Music Player and more.
Overall, this is one of the best data recovery tools you can have on your Windows computer. EaseUS Data Recovery also has a free version with restricted features. Overall, this is a stress-free solution to get back your deleted files
The Zed Attack Proxy team is pleased to announce two recently released initiatives:
ZAP In Ten
The team have just launched a new series of videos called 'ZAP in Ten' in conjunction with AllDayDevOps. ZAP in Ten is a series of short form videos featuring Simon Bennetts, project lead of the OWASP Zed Attack Proxy (ZAP) project. Each video highlights a specific feature or resource for ZAP.
ZAP API Docs
As part of OWASP's participation in Google's Season of Docs, the ZAP project has had @sshniro working on API documentation. The first iteration of the documentation is now live. It includes Java, Python, and shell example snippets all presented in a responsive and accessible design. Which we will continue to build on in the future.
Big thanks to Nirojan for his efforts on this wonderful initiative! Congratulations and thanks to Google Open Source for helping to bring the open source and technical writer communities together!Related articles
uTorrent, one of the most popular BitTorrent clients, is now available for Android smartphones and tablets. Its use on mobile devices is very similar to its use in the PC. All you need is to search for torrents using the web browser on your mobile device, then uTorrent will download the files.
Example of exploiting a single webcam entropy -b 1 -i [webcam's ip address and port] -v Example: entropy -b 1 -i 192.168.1.100:80 -v
Example of exploiting webcams from a list entropy -b 2 -l [file text] -v Example: entropy -b 2 -l iplist.txt -v
Example of exploiting webcams using shodan entropy -b 2 -v --shodan [you shodan api key] Example: entropy -b 2 -v --shodan PSKINdQe1GyxGgecYz2191H2JoS9qvgD
Entropy Toolkit disclaimer: Usage of the Entropy Toolkit for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state, federal, and international laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program. Entropy Toolkit license:MIT license.
