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Report Spam. Get Owned.

Thursday, March 15, 2018

So, a couple weeks ago Matt Svensson (@TechNerdings) dropped me a DM in Twitter:

Random other thing that I am curious if you guys have seen anything on... I just got an email from the local eye clinic. I hit the "spam" button on Gmail to report spam and unsubscribe. What I didn't realize is that it actually opens the unsubscribe link in the browser. Good news, easy unsubscribe. Maybe.....if you properly craft the spam...you could use the unsubscribe button to open a malicious web page?

Um... yeah! I immediately thought of how great a CSRF-via-email attack vector this was. Think about it. Users are trained not to click links, but in the case of Gmail, they're taught to click the handy-dandy "Report Spam" button to report it to the spam filter. But wait a second. The handy-dandy "Report Spam" button will go the extra step and unsubscribe the user from future attacks as well if the user so desires... and they do. ... more


Cooling Down the Hottest Ticket in Town

Saturday, August 26, 2017

We had an interesting conversation on the Proverbs Hackers mailing list today about getting tickets for popular conferences that have limited ticket sales. Security conferences most often thought of in this category are DerbyCon and ShmooCon. For anyone that has tried to get tickets to one of these conferences in the traditional fashion, you know the struggle is real. The conversation got me thinking about ways you can acquire a ticket that you may not realize are available. Below is the result of that thought exercise. ... more


Handling Missed Vulnerabilities

Wednesday, April 5, 2017

(Originally posted at https://nvisium.com/blog/2017/04/05/handling-missed-vulnerabilities/.)

Robin "digininja" Wood wrote this interesting article about the impact of missing vulnerabilities during security assessments. He makes a lot of good points, and the reality is, it's something we all deal with. Robin talks about how missing a vulnerability can be the end of one's career, or at least a large step backward. While this is true, his article only addresses the impact at a micro level. I'd like to expand on that. ... more


Proxying thru Virtual Client VPNs

Thursday, December 1, 2016

So, I'm sorta OCD. Anyone that knows me will attest to that. When it comes to my computing environments, I can't stand clutter. That includes both the external and internal components of my computing environment. One particular point of interest for me is the number of applications installed on my system. I've always felt like limiting the amount of software on my system to only what I needed, and avoiding endless install and uninstall cycles, has resulted in a more stable system. I have no scientific proof to back this up, but it's always worked for me, so I like to keep my system clean and tidy. However, in my line of work, where one-off tools for testing and research abound, this is a daily challenge. ... more


Fun with XSShell

Friday, July 15, 2016

So this is kinda fun. With this page open, copy and paste one of the listener commands from below into a terminal window on your local machine. Then, paste alert(42) into the resulting shell and press "Enter". Once you recover from the initial shock of what you just witnessed, play with the following payloads and spend the next hour of life thoroughly enjoying yourself. ... more


Exploring SSTI in Flask/Jinja2 - Part 2

Friday, March 11, 2016

I recently wrote this article about exploring the true impact of Server-Side Template Injection (SSTI) in applications leveraging the Flask/Jinja2 development stack. My initial goal was to find a path to file or operating system access. I was previously unable to do so, but thanks to some feedback on the initial article, I have since been able to achieve that goal. This article is the result of the additional research. ... more


Exploring SSTI in Flask/Jinja2

Wednesday, March 9, 2016

This is the first of two articles covering research into SSTI in the Flask/Jinja2 development stack. This article only tells half the story, but an important half that provides context to the final hack. Please consider reading both parts in their entirety. Part 2 can be found here. ... more