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White Papers

White Paper Title Download Date
Leveraging XSRF with Apache "Compatibility with older browser" feature and Java Applet pdf Oct 2010
Cross Context Scripting with Firefox pdf Apr 2010
Exploiting Cross Context Scripting Vulnerabilities pdf Apr 2010

Popular posts from this blog

Pwning a thin client in less than two minutes

Have you ever encountered a zero client or a thin client? It looks something like this...

If yes, keep reading below, if not, then if you encounter one, you know what you can do if you read below...

The model above is a T520, produced by HP - this model and other similar models are typically employed to support a medium/large VDI (Virtual Desktop Infrastructure) enterprise.

These clients run a Linux-based HP ThinPro OS by default and I had a chance to play with image version T6X44017 in particular, which is fun to play with it, since you can get a root shell in a very short time without knowing any password...

Normally, HP ThinPro OS interface is configured in a kiosk mode, as the concept of a thin/zero client is based on using a thick client to connect to another resource. For this purpose, a standard user does not need to authenticate to the thin client per se and would just need to perform a connection - e.g. VMware Horizon View. The user will eventually authenticate through the c…

UXSS in McAfee Endpoint Security, www.mcafee.com and some extra goodies...

During the HITB2017AMS talk given in Amsterdam with @Steventseeley, I promised that I would have disclosed vulnerabilities affecting a security vendor product other than Trend Micro.

For those who have come to my blog for the first time and are looking at "insecurities" of security vendors, you might be interested as well on how we found 200+ remote code execution vulnerabilities in Trend Micro software...

But this blog post is dedicated to two McAfee products instead: McAfee Endpoint Security and SiteAdvisor Enterprise (now part of McAfee Endpoint Security). For simplicity, I will just refer to McAfee Endpoint Security for the rest of this post.

First let's demonstrate a particular type of XSS, a UXSS, considering that fact that it only affects the McAfee Endpoint Security plugin and does not depend on a particular web site or web application.

There are two different injection points:

-UXSS when user visits a red labelled web site - the payload is rendered in the BlockP…

Microsoft .NET MVC ReDoS (Denial of Service) Vulnerability - CVE-2015-2526 (MS15-101)

Microsoft released a security bulletin (MS15-101) describing a .NET MVC Denial of Service vulnerability (CVE-2015-2526) that I reported back in April. This blog post analyses the vulnerability in details, starting from the theory and then providing a PoC exploit against a MVC web application developed with Visual Studio 2013.
For those of you who want to see the bug, you can directly skip to the last part of this post or watch the video directly... ;-)

A bit of theory

The .NET framework (4.5 tested version) uses backtracking regular expression matcher when performing a match against an expression. Backtracking is based on the NFA (non-deterministic finite automata) algorithm engine which is designed to validate all input states. By providing an “evil” regex expression – an expression for which the engine can be forced to calculate an exponential number of states - it is possible to force the engine to calculate an exponential number of states, leading to a condition defined such as “ca…