This article addresses a vulnerability in Apache Tomcat that enables the attacker to read files on the server and, under certain conditions, execute arbitrary code. The problem lies in the implementation of the AJP protocol used to communicate with a Tomcat server. Most importantly, the attacker does not need any rights in the target system to exploit this vulnerability.
A critical vulnerability resulting in a denial-of-service error has been recently discovered in ModSecurity, a popular web application firewall (WAF) for Apache, IIS, and Nginx. The bug is truly severe: not only does the library stop working, but applications using it as well. Let’s see what was the mistake of the ModSecurity developers and how we, ethical hackers, can exploit this vulnerability in our penetration tests.
Not long ago, researchers have discovered two severe vulnerabilities in Apache Solr, a popular open-source full-text search platform. The first bug relates to incorrect handling of Velocity templates, while the second one originates from the DataImportHandler module. Their exploitation enables the attacker to execute commands remotely; therefore, both vulnerabilities must be treated as critical.