Non-Exploitable Security Issues

10 Dec 2016 by Hendrik Buchwald

In our previous calendar posts, we covered specific security issues in popular open-source applications that were detected by our code analysis solution RIPS. Most of the released issues lead to remote command execution, the most critical security vulnerability in PHP applications. But are all findings always exploitable? For more diversity of our calendar, we would like to introduce a few interesting examples today that turned out to be not exploitable and how RIPS handles these scenarios.

Read More

Precurio 2.1: Remote Command Execution via Xinha Plugin

9 Dec 2016 by Hendrik Buchwald

Precurio

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.

Read More

Serendipity 2.0.3: From File Upload to Code Execution

7 Dec 2016 by Hendrik Buchwald

Serendipity

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.

Read More

Expression Engine 3.4.2: Code Reuse Attack

5 Dec 2016 by Hendrik Buchwald

Expression Engine

Expression Engine is a popular general purpose content management system that is used by thousands of individuals, organizations, and companies around the world. The open-source version has about 250,000 lines of code and is a medium-sized web application. 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.

Read More

FreePBX 13: From Cross-Site Scripting to Remote Command Execution

1 Dec 2016 by Hendrik Buchwald

FreePBX

FreePBX is a web-based graphical user interface that helps users to manage voice-over-IP services. According to the creator, there are over one million production systems using FreePBX worldwide and 20,000 new installations monthly 1. It is the most widely deployed open-source PBX (Private Branch Exchange) platform in use across the world.

Recently, the announcement of a critical security vulnerability caught our attention that was fixed in August 2. Since FreePBX is written completely in PHP, we decided to throw it into our code analysis tool RIPS. The results were more than surprising…

Read More