Vulnerability in opnsense core

[ Description ]Official description

OPNsense core through 26.7.8 contains a configuration injection vulnerability that allows authenticated users to append ntpd.conf directives by embedding newlines in the fudge and refid fields. Attackers holding the page-services-ntp-gps or PPS privilege can submit CR/LF characters via services_ntpd_gps.php or services_ntpd_pps.php to inject directives loaded by ntpd running as root.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• abraxaslabs.tech/research/opnsense-ntp-gps-fudge
• github.com/opnsense/core
• github.com/opnsense/core/blob/26.7.8/src/etc/inc/plugins.inc.d/ntpd.inc
• github.com/opnsense/core/blob/26.7.8/src/www/services_ntpd_gps.php
• github.com/opnsense/core/security/advisories/GHSA-fq94-cxvc-9r7w
• www.vulncheck.com/advisories/opnsense-core-through-26.7.8-ntp-configuration-injection-v…