Compass Security Blog

Offensive Defense

Yet Another Froala 0-Day XSS

Compass found a DOM-based cross-site scripting (XSS) in the Froala WYSIWYG HTML Editor. HTML code in the editor is not correctly sanitized when inserted into the DOM. This allows an attacker that can control the editor content to execute arbitrary JavaScript in the context of the victim’s session.

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Relaying NTLM authentication over RPC

Since a few years, we – as pentesters – (and probably bad guys as well) make use of NTLM relaying a lot for privilege escalation in Windows networks.

In this article, we propose adding support for the RPC protocol to the already great ntlmrelayx from impacket and explore the new ways of compromise that it offers.

This vulnerability was discovered by Compass Security in January 2020, disclosed to Microsoft Security Response Center and assigned CVE-2020-1113 as identifier.

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New SMBGhost Vulnerability Affects Modern Windows Systems

A new vulnerability (CVE-2020-0796) affecting SMBv3 has been discovered. The community has started to name this vulnerability SMBGhost because everyone knows this vulnerability is present but no additional details are available. Microsoft also released the advisory ADV200005. [1]

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Introducing Web Vulnerabilities into Native Apps

Mobile applications nowadays make heavy use of WebViews in order to render their user interfaces. Frameworks such as PhoneGap / Apache Cordova are even used to implement most of the application’s functionalities using WebViews only.

While native code, both in Android and in iOS, can quickly be analyzed using dynamic analysis tools like Frida, operations performed in WebViews cannot be easily debugged with the same methods.

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No need to break in, use the backdoor

The idea Some time ago I read a tweet about hunting so-called “sticky-keys backdoors”, referencing a presentation at DEFCON 24, https://www.youtube.com/watch?v=EAYtRQKfna0 In addition to the presentation, the team released a tool called “Sticky Keys Slayer” that is publicly available on GitHub, https://github.com/linuz/Sticky-Keys-Slayer/ The sticky-keys backdoor is using a simple trick. On a Windows system, it is possible […]

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SharePoint: Collaboration vs. XSS

SharePoint is a very popular browser-based collaboration and content management platform. Due to its high complexity, proprietary technology and confusing terminology it is often perceived as a black-box that IT and security professionals do not feel very comfortable with. These days, web security topics are well understood by many security professionals, penetration testers and vendors. But what […]

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SharePoint: How to collaborate with external parties?

Opening up an internal SharePoint farm to the Internet in order to share resources with external parties might seem a good idea, because it helps avoiding expensive infrastructure changes. However, in terms of security, this is not recommended because it does not sufficiently protect internal resources from external threats. The protection of internal resources hinges […]

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Wrap-up: Hack-Lab 2017#2

What is a Hack-Lab? Compass Security provides a monthly playful occasion for the security analysts to get-together and try to hack new devices, dive into current technologies and share their skills with their fellows. This also includes the improvement of internal tools, the research of newly identified publicly known attacks, and security analysis of hardware […]

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Wrap-up: Hack-Lab 2017#1

What is a Hack-Lab? Compass Security provides a monthly playful occasion for the security analysts to get-together and try to hack new devices, dive into current technologies and share their skills with their fellows. This also includes the improvement of internal tools, the research of newly identified publicly known attacks, and security analysis of hardware […]

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ASP.NET Core 5-RC1 HTTP Header Injection Vulnerability

ASP.NET Core is a open-source and cross-platform framework for building modern cloud based internet connected applications, such as web apps, IoT apps and mobile backends. ASP.NET Core apps can run on .NET Core or on the full .NET Framework. It was architected to provide an optimized development framework for apps that are deployed to the cloud […]

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