Saturday, August 12, 2017

2017-028-disabling WU?, Comcast wireless hack, and was it irresponsible disclosure?


 This week went in a different direction from what we normally do. We discussed some news, a twitter conversation about someone from the 'ahem' "media" that suggests that you disable Windows Update on your home devices. We discuss the pros and mostly cons of doing that, and alternatives to protect your home and work devices from that.

We talked about the Comcast Xfinity applicances and how they have a vulnerability that could make it appear that traffic created by people outside of your house could look like it was coming from your home network.

We discuss the public disclosure of Carbon Black's architecture and seeming sharing of customer events to 3rd parties... it's not all black and white, and we discuss those here.

 

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---SHOW NOTES---

Twitter discussion -

https://twitter.com/Computerworld/status/894611609355603968

 

http://www.computerworld.com/article/3214146/microsoft-windows/it-s-time-to-check-your-windows-machines-and-temporarily-turn-off-automatic-update.html

 

[sic] “tons of problems with Automatic Update patches so far this year”

[sic] “if you’re savvy enough to be reading this, you should consider turning Auto Update off, too”

 

Advocating disabling auto-updates in an OS is reckless.

Home networks for majority of users is completely flat

One Vlan (e.g. 192.168.1.0/24)

‘Savvy’ = technical

Which many of our users are not

 

Probable scenario: Bad guy targets you or family through a phish. They gain access to family computers, and pivot through those to your office computer

 

Blue teamers: suggest backups and backup options to keep their data safe and allow them to feel safer with automatic updates enabled, and VLANs if possible

 

Typically enterprises will hold off a few days or a week to push out Windows patches; Auto-updates are controlled.

The twitter guy said that in more recent Windows versions, WU take precedence over WSUS… need to confirm that… -- brbr

Confirmed… you can override WU… https://blogs.technet.microsoft.com/wsus/2017/08/04/improving-dual-scan-on-1607/

 

http://www.computerworld.com/article/3213929/microsoft-windows/the-case-against-windows-automatic-update.html

http://www.csoonline.com/article/3214487/security/pentest-firm-calls-carbon-black-worlds-largest-pay-for-play-data-exfiltration-botnet.html#tk.twt_cso

--this-- not because of title, but because of people jumping to conclusions (example of irresponsible disclosure)

Agreed… that shiz is damaging -- brbr

 

 

 

NoStarch TCP guide - https://www.nostarch.com/tcpip.htm

IPV4 -https://en.wikipedia.org/wiki/IPv4

 

[graphic of IPv4 header from wikipedia article]

 

IHL - size of the header (minimum of 5)

DSCP - has to do with traffic shaping and QoS

ECN - notifies the network of congestion and allows infrastructure to implement congestion controls to compensate

Must be supported by both ends, and completely optional to enforce

Total Length - total size of the packet

Identification - interesting field, you can use it to hide data (Covert_TCP), otherwise, it’s used for ‘used for uniquely identifying the group of fragments of a single IP datagram”

 

https://github.com/tcstool/Fireaway

 

http://www.securityweek.com/coolest-talk-defcon-25-no-one-writing-about

 


Here is a new episode of Brakeing Down Security Podcast!

Thursday, August 3, 2017

2017-026-Machine_Learning-Market Hype, or infosec's blue team's newest weapon?


Direct Link: http://traffic.libsyn.com/brakeingsecurity/2017-026-Ally_miller_machine-learning-AI.mp3

Ally Miller (@selenakyle) joined us this week to discuss Machine Learning and #Artificial #Intelligence. It seems like every new security product employs one or both of these terms. She did the keynote at Bsides Las Vegas on topics of #Machine #Learning and #Behavioral #Economics.

We asked Ms. Miller to join us here to discuss what ML and AI are, how algorithms work to analyze the data to come to the right conclusion. What is required to get a useful algorithm, and how much or little human interaction is required?

We also discuss a bit of history with her, how IDS/IPS were just dumber versions of machine learning, with 'tweaks' being new Yara or snort rules to tell the machine what to allow/disallow. 

Finally, we discussed how people who are doing our 2017 DerbyCon CTF, instructions on how to win are in the show, so please take a listen.

 

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show notes

 

what is the required amount of data required to properly train the algorithms

 

how do you ensure that the training data is clean (or perhaps how do you determine what causes a false positive or negative)

 

Xoke Soru: "why are you trying to make skynet and kill us all?  Do you hate humanity?"

 

Who will ML replace? Who in security?

 

Ask why people get confused between AI and Machine learning, and where the fine line is between the two or is one actually a subset of the other.

 

Basically.. "in what way/how do you see ML being used in an offensive capacity in the future (or now)"

 

https://en.wikipedia.org/wiki/Artificial_neural_network

 

https://en.wikipedia.org/wiki/Machine_learning

 

https://en.wikipedia.org/wiki/Portal:Machine_learning

 

https://www.slideshare.net/allyslideshare/something-wicked-78511887

 

https://www.slideshare.net/allyslideshare/201209-a-million-mousetraps-using-big-data-and-little-loops-to-build-better-defenses

 

https://conferences.oreilly.com/velocity/vl-ca/public/schedule/detail/61751

 

O’Reilly Conference 31 October

 

Mick douglas class

Derbycon CTF

Book club

 

Patreon

slack


Here is a new episode of Brakeing Down Security Podcast!