abb's blog

I would like to announce release of sslcaudit 1.0. This tool is designed to automate testing SSL/TLS clients for resistance against MITM attacks.

There is no proper installation procedure yet (Debian package and distutils-based Python installer are coming soon). For now just fetch the release from GIT repository:

~$ git clone -b release_1_0 https://github.com/grwl/sslcaudit.git
Cloning into sslcaudit...


UPDATE: Newer version of sslcaudit is available here.

Here is sslcaudit v1.0 RC1. The goal of the project is to develop a utility to automate testing SSL/TLS clients for resistance against MITM attacks. The project is GPL-licensed, source code hosted at github. PDF user guide is available at here.

I've written a custom TCP port scanner, to handle a broken target sporadically responding with SYN-ACKs even on filtered ports. Nmap detect such ports as open (in syn- and connect-scan modes).

$ sudo ./run.sh -s 172.16.33.1 -d 172.16.33.144 --p0 21 --p1 25 -i vmnet8
INFO:Scanner:res 172.16.33.144:24, res=closed)>
INFO:Scanner:res 172.16.33.144:22, res=open)>
INFO:Scanner:res 172.16.33.144:21, res=filtered)>
INFO:Scanner:res 172.16.33.144:23, res=fake-open)>


Here is a little tool which help finding and dumping any serialized Java objects in a binary stream. It accepts just one parameter -- the name of the file to load the binary stream.

First run:

$ java -jar jsersearch.jar /tmp/payload.dat
Found objectStream at offset 55, dumping ...
Caught exception while dumping java.lang.ClassNotFoundException: XXXRequestBase
End of dump (from offset 55)
Offset 1756 exception java.io.EOFException


Well, maybe the title is a bit ambitions, but at least the script below is is an improvement comparing to these two approaches: 1 and 2:
* It validates server-side certificate instead of ignoring them
* Logs out to invalidate the session cookie and wipes the temporary file used to store it
* Does not fetch whole bulk of RRD data


#!/bin/sh -e

user=***
password=***
host=***

cacert=$host-cacert.pem

Here are some notes about my attempt to install Ubuntu 11 on Kingston SV100S2/256G SSD (on Dell Latitude E6510 laptop). Just in case somebody else finds it useful.

I have Googled around for information about SSD disk optimization for Linux and found that there are two main things to consider: partition alignment and filesystem options.

It appears to be important to (try to) align disk writes by the boundaries of SDD erase block size. This [1] article talks about LVM volumes alignment.

Introduction

From time to time I come across a web service that expects its input in some proprietary format, usually JSON distorted in one way or another. A vulnerability scanner knows nothing about that stuff and can't properly fuzz it. (At the time of this writing Acunetix and Burp Pro support JSON only in HTTP responses.) In this case one has to resort to pure manual testing or partially automatic test with a fuzzer. Both approaches have their limitations, and I decided to finally find a way to run an automated scanner against proprietary web services.

Sometimes it is useful to run an intercepting proxy (running non-root user) on a privileged port. On debian-based systems it is possible using authbind facility.

The first step is to record the necessary port number in authbind config:

$ sudo touch /etc/authbind/byport/443
$ sudo chown abb:abb /etc/authbind/byport/443
$ sudo chmod 755 /etc/authbind/byport/443


After that, run Burp with authbind to let it use privileged port configured above:

Libvirt is a toolkit to manage virtual infrastructures. It is supposed to support VMWare ESXi hypervisor, but the package in Ubuntu 10 repository is compiled without necessary drivers (as of time of writing). One can find libvirt compilation instructions here, but they are not Ubuntu-specific nor mention ESXi.

I am releasing jnetbridge, which will be responsible for receiving and sending network packets in Marvin 0.92 (the current version, 0.91, still uses jpcap). It is based on JNetPcap (JNI adapter to libpcap/winpcap + protocol analyzer in Java). JNetBridge is a small piece of code on top of the massive JNetPcap library.

To cut the long story short, below is a bunch of files you may want to have a look at, if you are Java developer trying to implement some sort of a network bridge or a router.