postgresql

In 2021 I discovered several high and critical vulnerabilities in the Kaseya Unitrends backup appliance. This research was conducted and published as part of my day job. Part one details a chain of vulnerabilities by leveraging an insecure PostgreSQL database to ultimately gain shell access to the remote server. Visit https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1 for the full write-up. Stay tuned for part two.

Vulnerability Summary The pg_ctlcluster script in the postgresql-common package in Debian and Ubuntu is vulnerable to a local privilege escalation attack. pg_ctlcluster is a script used to manage PostgreSQL instances. A malicious actor with access to the postgres account can create arbitrary directories during startup or reload when called via systemd. This vulnerability can be leveraged to escalate privileges to root. It’s important to note this is not a vulnerability in PostgreSQL and is specific to Debian, Ubuntu, or any system that consumes the Debian postgresql-common package. ...