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Precurio 2.1: Remote Command Execution via Xinha Plugin

8 min read 9 Dec 2016 by Hendrik Buchwald
Precurio is an Intranet portal that can be used as a calendar, phone directory, and much more. It is available as an open-source and commercial solution. We focused our analysis exclusively on the open-source version and detected several critical vulnerabilities that can be used to execute PHP code on the target system without any form of authentication.

PHPKit 1.6.6: Code Execution for Privileged Users

7 min read 8 Dec 2016 by Martin Bednorz
Today’s gift in our advent calendar contains PHPKit, a German web content management system in development since early 2002. With its ~42,000 lines of code it is a rather small application and the latest version is 1.6.6. This post describes two severe vulnerabilities in the administration section that require a minimal user permission for exploitation.

Serendipity 2.0.3: From File Upload to Code Execution

8 min read 7 Dec 2016 by Hendrik Buchwald
Serendipity is an easy to maintain blog engine. There are a lot of plugins that can be used to extend the functionality, this article will focus on its core though. With close to 125,000 lines it is a medium-sized web application. In this post, we will show how attackers can bypass existing security mechanisms which can lead to remote code execution attacks.

Roundcube 1.2.2: Command Execution via Email

10 min read 6 Dec 2016 by Robin Peraglie
Roundcube is a widely distributed open-source webmail software used by many organizations and companies around the globe. In this post, we show how a malicious user can remotely execute arbitrary commands on the underlying operating system, simply by writing an email in Roundcube 1.2.2 (>= 1.0). This vulnerability is highly critical because all default installations are affected.

Expression Engine 3.4.2: Code Reuse Attack

9 min read 5 Dec 2016 by Hendrik Buchwald
Expression Engine is a popular general purpose content management system that is used by thousands of individuals, organizations, and companies around the world. In this post, we will examine a code reuse vulnerability that leads to remote code execution. This vulnerability type allows an attacker to partly control the applications logic and to chain existing code fragements.