Security Research

Abusing Insecure WCF Endpoints

31 May 2018

Understanding Windows Communication Foundation (WCF) Services Windows Communication Foundation (WCF) is a framework for building service-oriented applications in the .NET Framework. A trend that we've noticed in .NET services is the exposure of dangerous methods through insecure WCF endpoints. Additionally, most of these services are started automatically as LocalSystem, which is the highest user privilege level available. This results in a situation where a WCF endpoint may become a gateway for normal users to abuse privileged service methods. We'll be…

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posted by Fabius Watson

Frida Engage Part Three | You Down With XPC?

28 March 2018

Overview In the final installment of the Frida Engage blog series, we will demonstrate how to use Frida for hooking and inspecting Apple's NSXPC API using the CleanMyMac 3 application as our guinea pig. NSXPC XPC is one flavor of the Inter-Process Communication technologies provided by Apple. "The XPC Services API, part of libSystem, provides a lightweight mechanism for basic interprocess communication integrated with Grand Central Dispatch (GCD) and launchd. The XPC Services API allows you to create lightweight helper…

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posted by Ben Watson

Oh the POSsibilities – Point-Of-Sale Insecurity

26 March 2018

Point-Of-Sale System & PCI-DSS The use of Point-Of-Sale systems can be seen in industries such as retail, hospitality, food service, apparel, grocery, automotive, etc. Any time you swipe a card to make a purchase or utilize a self-checkout kiosk, a Point-Of-Sale system is responsible for handling the intricacies of your transaction in the background. Given the delicate nature of Point-of-Sale, security standards have been created to protect consumers from malicious actors. The Payment Card Industry Data Security Standard (PCI-DSS) is…

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posted by Fabius Watson

XML EXTERNAL ENTITY (XXE) Processing

22 February 2018

XML External Entity (XXE) Processing: a Critical Web Application Security Risk If you've taken a look at the 2017 OWASP Top 10, updated for the first time since 2013, you might be wondering what in the world XML External Entity (XXE) processing is and how it pulled the number four spot of most critical web application security risks. Also, according to OWASP it’s an issue that is "not commonly tested as of 2017." Don't panic – here's a quick rundown…

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posted by Zach Varnell

Exploiting VyprVPN for MacOS

24 January 2018

Overview In 2017, VerSprite released an advisory for a privilege escalation vulnerability in the VyprVPN for macOS application. In this blog post, we'll dive into the process of finding this vulnerability and writing a simple exploit for it. Auditing When performing attack surface enumeration for any macOS application, I typically search for XPC (Cross Process Communication) API usage. I've found that rarely do I see XPC services in third-party applications being secured, so it tends to always be a focal point for my bug…

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posted by Ben Watson

Exploiting the Dolphin Browser for Android’s Backup & Restore Feature

14 December 2017

Overview On December 11, 2017 VerSprite published the following advisory for the Dolphin Browser. Advisory [VS-2017-001] Dolphin Browser for Android Backup & Restore Arbitrary File Write Vulnerability CVE ID CVE-2017-17551 Vendor Mobotap Product Dolphin Browser for Android < 12.0.2 Vulnerability Details The Backup and Restore feature in Mobotap's Dolphin Browser for Android 12.0.2, suffers from an arbitrary file write vulnerability when attempting to restore browser settings from a malicious Dolphin Browser backup file. This arbitrary file write vulnerability, allows an attacker…

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posted by Ben Watson

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