Nagios Log Server < 2026R1.0.1 Local Privilege Escalation via Writable Scripts and Sudo Rules

Vulnerability Description

Nagios Log Server versions prior to 2026R1.0.1 are vulnerable to local privilege escalation due to a combination of sudo misconfiguration and group-writable application directories. The 'www-data' user is a member of the 'nagios' group, which has write access to '/usr/local/nagioslogserver/scripts', while several scripts in this directory are owned by root and may be executed via sudo without a password. A local attacker running as 'www-data' can move one of these root-owned scripts to a backup name and create a replacement script with attacker-controlled content at the original path, then invoke it with sudo. This allows arbitrary commands to be executed with root privileges, providing full compromise of the underlying operating system.

References

• https://www.nagios.com/products/security/#log-server
• https://www.nagios.com/changelog/nagios-log-server/nagios-log-server-2026r1-0-1/
• https://www.vulncheck.com/advisories/nagios-log-server-local-privilege-escalation-via-writable-scripts-and-sudo-rules
• https://theyhack.me/Rooting-Nagios-Log-Server/