Breaking

Linq Injection – From Attacking Filters to Code Execution

Some of you (especially the .Net guys) might have heard of the query language Linq (Language Integrated Query) used by Microsoft .Net applications and web sites. It’s used to access data from various sources like databases, files and internal lists. It can internally transform the accessed data in application objects and provides filter mechanisms similar to SQL. As it is used directly inside the application source code, it will be processed at compile time and not interpreted at runtime. While this provides a great type safety and almost no attack surface for injection attacks (except from possible handling problems in the different backends), it is extremely difficult to implement a dynamic filter system (e.g. for datatables which should allow users to select the column to filter on). That’s probably the reason why Scott Guthrie (Executive Vice President of the Cloud and Enterprise group in Microsoft, also one of the founders of the .Net project) presented the System.Linq.Dynamic package as part of the VS-2008 samples in 2008. This library allows to build Linq queries at runtime and therefore simplify dynamic filters. But as you may know, dynamic interpretation of languages based on user input is most of the time not the best option….

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Misc

Welcome to Insinuator.net 2.0

It’s almost exactly seven years since Enno published the very first blog post on Insinuator.net. Meanwhile, quite a few things changed. It’s not only the ERNW Universe which grew significantly, but also Insinuator’s place within this universe was slightly adjusted. What started as an almost independent IT-Security blog became more and more the major publication medium of ERNW.

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Events

Black Hat 2016 Summary Part 2.1

A few months ago I had the opportunity to visit this year’s Black Hat in Las Vegas. Due to a few weeks of vacation following the conference here are my delayed 2 cents (part 1)

Abusing Bleeding Edge Web Standards For AppSec Glory – Bryant Zadegan & Ryan Lester (Slides)

Bryant and Ryan talked about new web standards which are already implemented in parts of the current browser jungle. Namely these standard were:

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Breaking

DameWare Vulnerability

In course of a recent research project, I had a look at SolarWinds DameWare, which is a commercial Remote Access Software product running on Windows Server. I identified a remote file download vulnerability in the download function for the client software that can be exploited remotely and unauthenticated and that allows to download arbitrary files from the server that is running the software.

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Breaking

How to Become Part of an IoT Botnet

I suppose there are many people out there who want to achieve a greater good, fight evil corp and “show those guys”. So why not set a statement and become part of a botnet? #Irony!!! Of course I suppose (hope) that none of you actually want to be part of something like an IoT botnet, but joining could in theory be dead easy. So quite a while back I bought a dead cheap WiFi camera for use at home. It was kind of just as insecure as I had expected, so it got it’s own VLAN and stuff and here is why….

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Building

Diving into EMET

Last week, we decided to take a look onto the EMET library provided by Microsoft. This library is intended to introduce several security features to applications which are not explicitly compiled to use them.

It also adds an additional layer to protect against typical exploiting techniques by filtering library calls, preventing usage of dangerous functions/components and inserting mitigation technologies.

As EMET is already a target for many researchers, we currently only started to get an overview of it’s structure and how the different components are interacting with each other. Today we would like to share some of our results with you.

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Misc

Introducing the Kernel Space Invaders

Today it is my pleasure to shortly introduce ERNW’s Capture the Flag team, the Kernel Space Invaders. As a long-time CTF enthusiast, I’m really amazed how many of us make the time to tackle IT security challenges also on the weekends or evenings. Even if we cannot participate in all CTFs out there (which would be challenging anyways given the large number of CTF events happening nowadays), we started to compile a repository of some of our write-ups — I hope some of you will enjoy!

 

Cheers,

KSI

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Events

BSides LV 2016: Recap

Hey everyone,

Just a short recap from my side regarding this year’s BSide in Las Vegas, NV. It was my first time there and I pretty much enjoyed it. After entering the venue on the first con day (Tuesday) I was a little bit shocked, as the staff sent me to the “end of the line just around the corner” – the end being many corners and many floors away 😉 Speaking to some guys while standing in line, time quickly passed by and before finally hitting the registration desk, there were already some people from the staff giving away the conference badges to the waiting folks. The waiting time was no comparison to last year’s DEF CON, where I (and obviously all the other “humans”, how attendees at DEF CON are called) had to wait nearly _four_ hours to get a badge to enter the con. DEF CON staff already calls this the annual “Line Con”. Enough bashing, back to topic 😉

The opening keynote was held by Lorrie Cranor, who spoke first and Michael Kaiser, who did the second part. I enjoyed Lorrie’s part which was about frequent password changes in environments like companies or universities. She talked about studies that revealed, many people who have to change passwords frequently use patterns by changing their passwords, like shifting letters or iterating numbers. This behavior mostly provides only a little security benefit or could otherwise also decrease security, she said.

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