In a previous post I did an analysis of HTTP headers returned by Belgian websites. The list of websites was based on an old Alexa datafile and more or less reflected the most ‘popular’ Belgian websites. I now trimmed these domains to their top domain only (so www.site.be and alpha.site.be became site.be) and decided to check what type of MX records are defined for the different domains.
MX records are DNS records that specify a … Read more.
This is the second part in the analysis of the content of HTTP headers returned from Belgian websites. The first part describes what HTTP headers are and analyses the results of the network requests.
Disclosing HTTP headers is not going to make your site more vulnerable nor is not disclosing them going to make your site more secure. But by leaking version information you basically give away your level of patch management, making it easier … Read more.
This analysis on HTTP headers is separated into two different blog posts :
describing what HTTP headers are and analyzing the results of the network requests analyzing the content of HTTP headers
The separation in two parts follows the logical sequence of events that I had to do to complete the investigation. First I had to map the network and interpret these results and then dive deeper in the returned HTTP header results.
Note that … Read more.
Recently I had to verify traffic in a netflow collector for connections to a list of interesting networks (networks suspected to serve malicious content or C&Cs). The netflow collector that was used was an Arbor Peakflow solution.
In Arbor you can browse the raw flows via Explore -> Forensics. This feature allows you to look for specific traffic based on a FCAP filter.
… Read more.Tor protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, and it prevents the sites you visit from learning your physical location (from https://www.torproject.org/).
There are Tor Bundles that you can install but you can also chain Tor through a proxy.
I’ll use an Ubuntu 1214 vmware machine to proxy my traffic. … Read more.
Websites get attacked daily. Sometimes the attacker succeeds in accessing the website. This is often told as “we got hacked” but in most cases a “our website got defaced is more accurate.
This post describes what you have to do if you control your website (a custom build website or a CMS website build with Drupal, Joomla, WordPress, …) via FTP and you do not have a shell account on your server.
In most cases … Read more.
Update 20140716
“This could allow an attacker to execute OS commands.”. That is the notice on the security page of Elasticsearch.
A vulnerability that allows execution of system commands should always raise concern.
Some people running a public Elasticsearch instance reported cases where attackers were able to upload scripts. It turned out that when Elasticsearch was available on the Internet (port tcp/9200) and had dynamic scripting enabled then users could execute arbitrary scripts. … Read more.
Dionaea is a low-interaction honeypot. It is one of the honeypots that can be deployed through the Modern Honey Network. Next to the MHN dashboard I also wanted some specific data on the Dionaea honeypot. That is where DionaeaFR kicks in.
The installation is described in detail on the github page and on http://bruteforce.gr/visualizing-dionaeas-results-with-dionaeafr.html.
I had to add some extra packages and settings on a Ubuntu 12.04.4 LTS system. Below is the full … Read more.
After Heartbleed I wrote a small python script to have an automatic check of certification expiration date. The script is hosted on Github.
Next to SSL certificates there are also GPG keys that can (but do not have to) have an expiration date. If you manage a lot of (personal or shared) keys it can become difficult to keep track of expired or soon to be expired keys.
So I wrote a similar python script … Read more.
After Heartbleed and generating lots of different new certificates I searched for a tool that sends me an alert when a certificate is about to expire. Basically I need an automatic check of expiration date of certificates. My requirements were
daily checks; notification by email; check for certificates on internal and external network; check for certificates on non-web service (imap, pop, …).
There are a couple of tools that cover part of my requirements but … Read more.
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