LayerOne 2012 | Drinking from the caffeine firehose we know as shodan

Video of my presentation:

(edit: the videos audio doesnt start until 18 seconds in. I’ve edited it, and the video is updating on youtube. This is temporary, please bear with me)

Slide Deck: long-tail-of-the-internet.pdf


So, you pillaged a domain controllers hashes…

So you’ve managed to find your way to a domain controller, perhaps used metasploits meterpreter, perhaps got system, migrated to lsass.exe and perhaps were able to use incognito to smart_hashdump and nab all the password hashes.  Well, you can hand those off to john the ripper and it will happily crack the LM portion of what you’ve got – but you’ll end up with a bunch of uppercase passwords.

Enter – a dandy little perl script that will take the uppercase password and use it as a dictionary to crack the NTLM password for you. Only trouble is that since it was written, the awesome guys  at openwall who develop john the ripper have changed the output format of cracked password files. The lm2ntcrack input format was written for a ~2009 version of JtR, so to get it properly working someone had to go and make a tiny tweak in the script where it analyzes the syntax/order of the input file.

So I did it! First time, actually, that I’ve done something like this. And it appears to work! – at least it works on the ntlm hashes I have from a demo network.


Anyhow, here’s my updated copy of the script –


Save that as a .pl file (it’s a .txt so it doesn’t get run on the site).

Feedback welcome!

(almost) 90 days with the Motorola Xoom

Just about three months ago I wrote a quick post about having the Motorola Xoom for approximately 12 hours.

First I’d like to address some of the points I made in my last post:

Now the TODO list:

  • I have both ubuntu and backtrack5 running on this thing in chroots. While I now have access to tools like nmap, skipfish and other command line tools, some of the interesting ones (ettercap, aircrack) do not yet function due to lack of the proper kernel modules. I’ve contributed to the Tiamat kernel thread on the XDA forums asking if adding that kind of functionality was feasible.



Everywhere I go, I get asked “is that the new ipad?” and I answer “no, its better”. People look confused. I used to get into debates about it, but now I just dont care. I’ve accepted the fact that the vast majority of people prefer a snappy UI and pretty pictures over functionality and an open attitude. I’ve recently figured out how to get my eye-fi to work with the thing, and I’ve been out a few times while taking pictures and having them zip from my leica directly over the xoom (this is a REALLY cool party trick – I intend on utilizing this somehow combined with a projector at this years ninjapenguin party.).

This platform does everything I need that doesn’t require massive horsepower including simple security tasks – like portscanning and browsing open fileshares, nmapping, and running metasploit. I can watch movies on it, get directions (chrome to phone is awesome on this thing), watch full-screened high-res episodes of southpark from and other flash sites (since it supports flash) browse full HTML5 and flash websites, and even set it up like a mini entertainment set – with the jawbone jambox speakers setup as bluetooth speakers.

It’s overclocked from 1ghz to 1.6 ghz with little to no impact on the battery. The modified kernel allows me to have external SD storage enabled and PTP and USB OTG modes so that I can plug in external devices and storage (though I have not yet tried a mouse or keyboard, usb sticks and my leica d-lux 4 work like a champ – for some reason the d3s isn’t properly recognized, so I’ve opened a ticket with google). I hope to use it in a photography sense as well (in Vegas this year, if I’m lucky) with the square reader and squareup app – which lets me accept credit cards as an individual. I can torrent from the thing, as well as use it as a backup phone by way of a skype-in number and a bluetooth headset. The list just goes on and on!

I’ve been tapped to use it as a support tool – once at drinkup a friend had a need to use a variety of basic linux tools such as traceroute, ping and telnet – I was able to hand him my xoom in an ubuntu chroot and tell him ‘go to town’. I can use it to remote control any of my computers as well, even remotely ‘hamachi style’ using a tool called neorouter.

I intend for this to be my “computer” while I’m at Defcon/Blackhat this year. I can easily offload all my photos to it, and it does everything I need while I’m on the go. Someday I hope to actually give a talk from this thing, completely without a laptop.

tl;dr: If you just want a toy, buy an ipad. If you want a tool? Buy the xoom.



  • I still want a site survey tool. Especially overclocked past %50. this thing screams.
  • Having the jambox speakers helps when I want other people to hear stuff, otherwise I want a case that has little ‘ears’ to funnel the speakers forward.
  • Having backtrack5 on this thing is badass, but some of the more impressive stuff is unavailable – I cant send arp traffic and I cant put the wifi interface into monitor mode or inject traffic. I’ve asked about it on the xda thread.
  • I really wish someone would port VLC over to android. This hardware has so much still untapped potential – I want to be able to watch a 720p mkv. Standard dvd rips work fine, highres stuff chokes – because the players don’t leverage the GPU
  • I want to find out why the hell it doesn’t work with my Nikon D3s. It sees the camera, but never sees any photos. wtf?

How to steal Facebook Authentication cookies

How to hack a facebook account – or, basically how to hijack php sessions. Yes – this is old news – yes its a common vulnerability – but you get a better idea for what it is and how it works when things are explained in detail (with screenshots!).

Before we begin, however, I want to re-emphasize that it is VERY EASY to protect yourself against this sort of attack. Facebook supports HTTPS, so when you browse facebook (or twitter for that matter) or if you have it bookmarked – please make sure you’re using HTTPS:// rather than HTTP:// in the URL at the very least, if not using a VPN solution for further encryption. Also, if the ‘victim’ logs out of facebook, the attackers session becomes invalid – so it’s a good practice to actually log out of facebook and log back in again rather than using the ‘remember me’ checkbox.

Facebook like many sites operates using authentication cookies. Their auth cookies contain a variety of information, but for our purposes this is irrelevant. Here is a sanitized cookie for reference:

Cookie: datr=1276721606-b7f94f977295759399293c5b0767618dc02111ede159a827030fc; lsd=Xesut; lxe=greg.evans%40****************; c_user=100001230367821; lo=wl9fcGXMhPfoT4bAhKFP3Q; lxs=1; sct=1276721745; xs=a615cfe596448194d6e2a8d062a90e4e

You can see the ‘lxe’ field is the login. We haven’t done any further research into what the various other fields mean, but using facebook without any kind of security you’re both leaking the email address used for your login and the session cookie.

First thing you’ll want to do is fire up your favorite packet capture application. For this example we’ve used Wireshark:

Next, set the filter in the top left to ” http.cookie contains “datr” “. This should show you only packets captured which contain the cookie we’re looking for. You can see that in this screenshot we’ve already captured a cookie.

Once you’ve found a suitable cookie, you can copy it into the buffer by right clicking on the cookie line, and clicking Copy -> Bytes (Printable Text Only)

Next you’ll want to open up firefox. You’ll need both greasemonkey and the cookieinjector script.

Simply browse to facebook – make sure you are not logged in:

Hit ALT-C to bring up the cookie injector dialog box:

Then paste in the cookie!

Hit refresh and – VIOLA! you’re now logged in as your victim! Now this doesn’t give you access to their credentials, this is about the equivalent to walking up to their workstation while they’re away from their desk and using facebook.

Neat huh? Pretty easy too. I smiled big when we demo’ed the attack in our lab – its old, sure, but being successful is always a good feeling!

P.S: This isnt REALLY Gregory Evans account. We setup this account because .. well.. the name was available! We thought it was in good taste as the No #1 hacker’s twitter feed got hacked the other day, his site is riddled with XSS exploits, and his book is copypasta from a variety of certification exam prep books. Thanks to Nick and mckt for the work and tootilage, respectively. No noobs were harmed in the making of this film.

Adding context

However good or bad you think you are at security, this may put a few details into perspective for you:

In the last few weeks Ligatt Security has been “making headlines” with their 90’s-esque hackers-style commercials and advertisements – the three most notable of which advertise that large black men, 12 year old boys, and “hackers” with what appear to be ethernet-enabled projectorgoggles are “out to get you”. Their fear-based marketing campaign slants the average computer users security experience using the standard “if you don’t hire us, your life is pretty much over” routine.

It’s a pretty huge bag of fail – I really hope this is a learning experience for them. One of the more important ‘scout badges’ I’ve earned in my time as a contractor so far is “practice what you preach”. A “large”, publicly traded “information security company” probably should have taken the time to do some BASIC SECURITY on their own website – CLICKY!

virtually lol-inducing. wow, i actually typed that.

EDIT: After a couple of twitter posts about this they’ve firewalled me off of the host. Firewalling one guy isn’t gonna help guys, I’m certain I’m not the only person to have found a CORNUCOPIA of publicly available vulnerabilities on your site.

Zipline – a VPN security product.

How many of those wordpress, joomla, drupal blogs, web2.0 products of various sort and other websites do you go to that are encrypted using SSL(https)? How many times a day to you enter your credentials, or use cookie based (the ‘remember me’ checkbox type) authentication on websites a day? Do you find yourself in coffee shops, or other public wifi frequently and sometimes wonder who is watching your traffic?

I know I do. Up until now I’ve been using SSH tunnels to get my traffic back home where I know nobody is running a packetsniffer. The trouble with SSH tunnels though is that they’re fickle, and often drop. I wanted a better solution – so I made one.

Continue reading

State of the pwnion.

message begins
Personal details were revealed, emails, chat logs – pretty scary stuff – and very sobering. A clear demonstration that things like cross site scripting and the spreading of malware (likely for the use of cascading spam or addition to botnets) is the least of our problems. Also clear proof that people who consider themselves security folks have to be very wary of using creature comforts such as reusing passwords or even operating a wordpress blog (3 updates in a month?! and 2.8.2 is vulnerable? gaw!).
The textfile the group distributed was called zf05.txt and after skimming it’s abundantly clear that wordpress played a huge part in these folks getting rooted. Almost every example was sort of an ‘all in one’ server that was used for ‘whatever’. Its also become clear that jam packing one server with a bunch of services makes it more vulnerable to compromise. Ever heard of KISS? “Keep it simple, stupid”. It’s used very commonly among engineers, computer people – you name it. Anyone that has to build things or design things. The minute you start adding complexity for no reason the proverbial altimeter begins its decline.
People who fake tech exacerbate things. There are groups that call themselves “tech” when in reality they are simply PR or Marketing. The Web 2.0 craze has hypnotized people into putting almost everything they think and do ‘behind the scenes’. They let someone else worry about it. Some ruby programmers I’ve met are incapable of manually issuing a sql query. Others are incapable of interacting with sql unless they have phpmyadmin. These folks generate a requirement to artificially make systems more complex and less secure entirely to suit their evergrowing hatred of looking things up themselves or actually learning anything about the technology they use every day. The easiest way to think about it is this: Think of some people. Now think of these people all owning cars. Think of these people now requiring something as simple as an oil change, a tire change, or a simple tune up. Now think of these people taking their cars to a shop to get work done – for whatever reason: maybe they lack the tools, maybe their HOA doesn’t allow them to perform work on their cars on the grounds (those HOA people desperately need to be stabbed in the lungs, by the way) or maybe they just don’t know how. Now lets imagine these people have the work done, and are talking to the mechanics as they are preparing the invoice behind the counter. The mechanic begins to explain how their oil was changed, and these people abjectly refuse to learn or understand how this works even from a top-level non-technical aspect – they plug their ears and yell “NO! NO! AAALALALALA!! NOT LISTENING NO NOOOO! ALLALAAAAAA!”.
These people strongly support a fancy new term. “Cloud Computing”. Cloud computing will make this worse for everyone.
Let me jump away for a moment. I’d like to point out a fact. The attackers that distributed zf05.txt made a valid point – a point I’ve tried to make to peers, friends and clients alike – If your site/data are on shared hosting and you consider them secure that may mitigate some amount of risk. But if the other people hosting their data are vulnerable and your data is on the same system, you’re still vulnerable.
Now we have some ingredients – lets make a stew. Lets take these bits of information and put them all together and let it simmer.
– Non technical people whos requirements and behavior are insecure and promote systems being rooted
– Systems with lots of various services running on them
– A new trend of mashing these systems together to form giant systems that do the same thing, ending up being bigger and more powerful
– Commonly used software being exploited within a week of a patch.
Mix in a bowl with a wisk until creamy. Add a teaspoon of extra virgin olive oil to a cast-iron skillet. Add a bit of freshly cracked pepper to the oil and some freshly pressed/minced garlic. Let simmer until the pepper and garlic begin to bubble, then pour the mixture from the bowl into the skillet and add a squeeze of fresh key lime if you wish. Cook until firm or golden brown, flip once, then serve! Let stand for 10 minutes to cool. What do you get? What does it smell like? (Well if people actually taste of chicken then that may make one hell of a breakfast omlette). We dont know. Here’s why we don’t know:
– “Business people” like the idea of getting rid of systems administrators and IT overhead
– “Cloud Computing” does not have a security model yet
– There are no standards – this stuff is too new
– Far too many people are comfortable being hacked, and say “oh there’s nothing important on that sit/box”
.. Really, guys? You don’t use that same wordpress password everywhere? For your bank, for gmail, for your car insurance or your mobile provider to login? If a blackhat gets that password you’re really okay with it? If thats the case, I’d like you to kindly leave the internet, never to return. Please – do us all a favor, for the people that like keeping their privates private and their secrets secret, go away.
So we’re going to take all of these insecurities, vulnerabilities and holes – package them up with non-technical people demanding insecure practices so that they don’t have to learn or think and we’re going to replicate this ad nauseum and store the results in one gigantic computer grid system? Awesome. Maybe I should trade in my whitehat for a black one – since thats obviously where all the focus, media, fear and money are going to be. Or maybe I’ll just make my white hat bigger – perhaps people will come to their senses and listen to fact and reason. Perhaps not. I guess we’ll see.
I’m not the only one, either… – open the ppt, this was the defcon talk. they pwned amazon ec2. – see the ‘theft of a rackspace cloud api key’. These guys got root on the rackspace/mosso cloud.

I was late to hear – by a day. Thats 10 years in internet time, we all know. If you’re not in InfoSec you probably didn’t hear. Maybe you heard somewhere, irc, twitter, other bits of the intarnets that Kevin Mitnick got hacked. Everyone chuckled. As it turns out a whole bunch of people got compromised. People I know personally who I consider friends. Rob Fuller, Dan Kaminsky, the Hak5 group and a handful of others, including Kevin Mitnick.

Personal details were revealed, emails, chat logs – pretty scary stuff – and very sobering. A clear demonstration that things like cross site scripting and the spreading of malware (likely for the use of cascading spam or addition to botnets) is the least of our problems. Also clear proof that people who consider themselves security folks have to be very wary of using creature comforts such as reusing passwords or even operating a wordpress blog (3 updates in a month?! and 2.8.2 is vulnerable? gaw!).

Continue reading

Making Security Research Relevant

I’m very very open and transparent about security, technology and what I do. I’ve written documentation so thorough that my clients have ended the contracts stating “we dont need you anymore – with these docs we can do the work ourselves” – in the grander scheme of things thats awesome. I love it when clients learn from me and it makes me feel really good about what I do – especially if it sticks the first time – but it certainly is prohibitive towards me paying my rent.

I’ve been very vocal in the last year about what I do – to the point it manifests itself as talks I give during BarCamp (LA and San Diego), and Refresh San Diego which is held at Qualcomm. Here is my most recent talk

Security 102, part 1 from Dan Tentler on Vimeo.

Security102, part 2 from Dan Tentler on Vimeo.

Video courtesy of @northlight

Continue reading

Security 101 at Refresh SD – Jan 13, Qualcomm campus

I thought that doing security101 at places like oggis may have been a tactical mistake because I want people to actually learn and benefit from some of this stuff, so having the discussion broken by the wait staff frequently simply murdered all the momentum the discussion had and the event turned into a hacking 101 lab where I just demonstrated attacks.

That being the case doing a security101 class in an actual classroom environment where I can have the attendees comfortable and perhaps even have a projector would likely be far far better. Phelan was gracious enough to let me usurp the january installment of refreshsd to give my security101 talk in a more meaningful and more formal environment. Refresh this month is on the 13th – see for details, or see the meetup group.
Here is my proposed curriculum:

Basic networking
– How do computers talk?
– what is a packet?
– whats IN a packet?

clear text versus encryption (http, ftp, dns)
how websites pass information around
How to tell if the site you’re on is passing your information encrypted or not.
Some network voodoo – watching the stream
-watching dns queries
(the next three may or may not be permitted depending on qualcomms network configuration)
basic man in the middle example
faking ssl certs
changing dns

Hope to see you all there!

Expediency in patches/fixes/knowledge

Everyone knows that there are vunlerabilities from time to time and you should upgrade things like wordpress, windows, osx and other pieces of software commonly used by lots of people. One thing that people don’t take into account is the actual times and dates of the proof of concept (POC), subsequent weaponization of the exploit (if it came from a nefarious source) then the vendors patch and announcement (if they even notice or care).
Lets take the most recent exploit that came out for internet explorer as our example. The first easily referencable date I could find for this exploit.

Thats right – Four days from POC to “publically downloadable and available for anybody to use“.

The day I’m writing this post (Monday Night, Dec 16) The microsoft investigation page still says they’re investigating. If they have any sense tomorrows ‘patch tuesday’ security patch should contain a fix.

That being said – It’s been a week and there is no patch. What does that mean for the end user, CEO, Marketing folks, Sales people, Graphic Artists and other people who arent focused on security all the time?

  • Everyone running IE7 in your enterprise/company/network is vulnerable (and still is, as of Dec 15)
  • If this is exploited there is a fair chance that nobody will know until there is a patch, or the antivirus vendors catch up.
  • If this is exploited on 0-day, then an attacker has been in your network FOR A WEEK ALREADY.
  • Once the fix comes out the hole is patched..
  • But it’s very likely entirely separate attacks were used once IE7 was exploited, so applying the patch to fix IE7 won’t fix any damage the attacker has done

Not everyone has to be security concious all the time. For that theres people like us!
Heres something I see every day: The list of new exploits that come out on (which is just one of the many sites that exist for publishing known exploits):

Look at the third one down on Dec 15 🙂