Last year we published a proof-of-concept tool to demonstrate bypasses against security products that still rely on the obsolete MD5 cryptographic hash function. Summary: The method allows bypassing malicious executable detection and whitelists by creating two executables with colliding MD5 hashes. One of the executables (“sheep”) is harmless and can...
2016-11-28 — 3 minute readIn the last couple of days we took a closer look at the supposed NSA exploit EXTRABACON, leaked by Shadow Brokers. As an initial analysis of XORcat concluded, the code is capable of bypassing authentication of Cisco ASA devices after exploiting a memory corruption vulnerability in the SNMP service. We...
2016-08-25 — 14 minute readDebugging applications without access to the source code always has its problems, especially with debuggers that were built with developers in mind, who obviously don’t have this restriction. In one of our Android app security projects, we had to attach a debugger to the app to step through heavily obfuscated...
2016-06-16 — 6 minute readAfter ImageTragick (CVE-2016–3714) was published, we immediately started thinking about detecting it with Burp, which we usually use for web application testing. Although collaborator would be a perfect fit, as image processing can happen out-of-band, there’s no official way to tap into that functionality from an extension. The next best...
2016-05-13 — 2 minute readWe’ve tested a number of iOS apps in the last few years, and got to the conclusion that most developers follow the recommendation to use APIs already in the system – instead of reinventing the wheel or unnecessarily depending on third party libraries. This affects HTTP backend APIs as well,...
2016-05-06 — 4 minute readWhen serving image assets, many web developers find it useful to have a feature that scales the image to a size specified in a URL parameter. After all, bandwidth is expensive, latency is killing the mobile web, and letting the frontend guys link to avatar.php?width=64&height=64 pretty straightforward and convenient. However,...
2016-02-10 — 3 minute readSANS Institute accepted my GWAPT Gold Paper about testing stateful web application workflows, the paper is now published in the Reading Room. The paper introduces the problem we’ve been facing more and more while testing complex web applications, and shows two working solutions. Burp Suite is known by most and...
2016-01-15 — 1 minute readDepending on the time spent in IT, most professionals have seen an instance of two where developers based their implementations on specific quirks and other non-standard behaviors, a well-known example is greylisting, another oft-used but less-known one is Wi-Fi band steering. In all these cases, the solution works within a...
2015-10-02 — 3 minute read