CVE-2025-34323: log server Permission Flaw — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-732 CWE-732

Affected Products

Vendor	Product	Versions
nagios	log_server	< 2026
nagios	log_server	All

References

Advisories & Patches

https://www.nagios.com/products/security/#log-server

Other References

https://theyhack.me/Rooting-Nagios-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

Frequently Asked Questions

What is CVE-2025-34323? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-34323? +

CVE-2025-34323 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-34323? +

CVE-2025-34323 affects products from nagios, specifically: log_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-34323? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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