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We found out that many TLS implementations are still vulnerable to different variations of a 19-year old Bleichenbacher's attack. Since Hanno argued to have an attack name, we called it ROBOT: https://robotattack.org

Given the new attack variants, we released a new version of TLS-Attacker 2.2, which covers our vulnerabilities.

Bleichenbacher's attack from 1998

In 1998, Daniel Bleichenbacher discovered that the error messages given by SSL servers for errors in the PKCS #1 1.5 padding allow an adversary to execute an adaptive-chosen ciphertext attack. This attack also belongs to the category of padding oracle attacks. By performing the attack, the adversary exploits different responses returned by the server that decrypts the requests and validates the PKCS#1 1.5 padding. Given such a server, the attacker can use it as an oracle and decrypt ciphertexts.

We refer to one of our previous blog posts for more details.

OK, so what is new in our research?

In our research we performed scans of several well-known hosts and found out many of them are vulnerable to different forms of the attack. In the original paper, an oracle was constructed from a server that responded with different TLS alert messages. In 2014, further side-channels like timings were exploited. However, all the previous studies have considered mostly open source implementations. Only a few vulnerabilities have been found.

In our scans we could identify more than seven vulnerable products and open source software implementations, including F5, Radware, Cisco, Erlang, Bouncy Castle, or WolfSSL. We identified new side-channels triggered by incomplete protocol flows or TCP socket states.

For example, some F5 products would respond to a malformed ciphertext located in the ClientKeyExchange message with a TLS alert 40 (handshake failure) but allow connections to timeout if the decryption was successful. We could observe this behaviour only when sending incomplete TLS handshakes missing ChangeCipherSpec and Finished messages.

See our paper for more interesting results.

Release of TLS-Attacker 2.2

These new findings motivated us to implement the complete detection of Bleichenbacher attacks in our TLS-Attacker. Before our research, TLS-Attacker had implemented a basic Bleichenbacher attack evaluation with full TLS protocol flows. We extended this evaluation with shortened protocol flows with missing ChangeCipherSpec and Finished messages, and implemented an oracle detection based on TCP timeouts and duplicated TLS alerts. In addition, Robert (@ic0ns) added many fixes and merged features like replay attacks on 0-RTT in TLS 1.3.

You can find the newest version release here: https://github.com/RUB-NDS/TLS-Attacker/releases/tag/v2.2

TLS-Attacker allows you to automatically send differently formatted PKCS#1 encrypted messages and observe the server behavior:

$ java -jar Attacks.jar bleichenbacher -connect [host]:[port]

In case the server responds with different error messages, it is most likely vulnerable. The following example provides an example of a vulnerable server detection output:

14:12:42 [main] CONSOLE attacks.impl.Attacker - A server is considered vulnerable to this attack if it responds differently to the test vectors.
14:12:42 [main] CONSOLE attacks.impl.Attacker - A server is considered secure if it always responds the same way.
14:12:49 [main] CONSOLE attacks.impl.Attacker - Found a difference in responses in the Complete TLS protocol flow with CCS and Finished messages.
14:12:49 [main] CONSOLE attacks.impl.Attacker - The server seems to respond with different record contents.
14:12:49 [main] INFO  attacks.Main - Vulnerable:true

In this case TLS-Attacker identified that sending different PKCS#1 messages results in different server responses (the record contents are different).

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RapidScan's Features:

One-step installation.
Executes a multitude of security scanning tools, does other custom coded checks and prints the results spontaneously.
Come of the tools include nmap, dnsrecon, wafw00f, uniscan, sslyze, fierce, lbd, theharvester, dnswalk, golismero etc executes under one entity.
Saves a lot of time, indeed a lot time!
Checks for same vulnerabilities with multiple tools to help you zero-in on false positives effectively.
Legends to help you understand which tests may take longer time, so you can Ctrl+C to skip if needed.
Association with OWASP Top 10 2017 on the list of vulnerabilities discovered. (under development)
Critical, high, large, low and informational classification of vulnerabilities.
Vulnerability definitions guides you what the vulnerability actually is and the threat it can pose
Remediations tells you how to plug/fix the found vulnerability.
Executive summary gives you an overall context of the scan performed with critical, high, low and informational issues discovered. (under development)
Artificial intelligence to deploy tools automatically depending upon the issues found. for eg; automates the launch of wpscan and plecost tools when a wordpress installation is found. (under development)
Detailed comprehensive report in a portable document format (*.pdf) with complete details of the scans and tools used. (under development)

For Your Infomation about RapidScan:

Program is still under development, works and currently supports 80 vulnerability tests.

Parallel processing is not yet implemented, may be coded as more tests gets introduced.

RapidScan supports checking for these vulnerabilities:

DNS/HTTP Load Balancers & Web Application Firewalls.
Checks for Joomla, WordPress and Drupal
SSL related Vulnerabilities (HEARTBLEED, FREAK, POODLE, CCS Injection, LOGJAM, OCSP Stapling).
Commonly Opened Ports.
DNS Zone Transfers using multiple tools (Fierce, DNSWalk, DNSRecon, DNSEnum).
Sub-Domains Brute Forcing.
Open Directory/File Brute Forcing.
Shallow XSS, SQLi and BSQLi Banners.
Slow-Loris DoS Attack, LFI (Local File Inclusion), RFI (Remote File Inclusion) & RCE (Remote Code Execution).

RapidScan's Requirements:

Kali Linux, Parrot Security OS, BlackArch... Linux distros that based for pentesters and hackers.
Python 2.7.x

RapidScan Installation:

RapidScan's screenshots:

RapidScan helping menu

RapidScan Intro

RapidScan Outro

How to contribute? If you want to contribute to the author. Read this.

Download RapidScan

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.

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Puffadust Mobile Blog (BAK)

Saturday, August 22, 2020

TLS-Attacker V2.2 And The ROBOT Attack

Bleichenbacher's attack from 1998

OK, so what is new in our research?

Release of TLS-Attacker 2.2

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RapidScan: The Multi-Tool Website Vulnerabilities Scanner With Artificial Intelligence

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BurpSuite Introduction & Installation

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