Werk #14682: Guard Livestatus against Nagios custom variables with an empty value.

Component

Livestatus

Title

Guard Livestatus against Nagios custom variables with an empty value.

Date

Aug 4, 2022

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.2.0b1	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.1.0p10	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
2.0.0p28	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
1.6.0p30	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When Nagios is configured with custom variables having an empty value, various Livestatus queries can crash the Nagios core. This has been fixed.

Reported by GitHub user ronansalmon, including a similar fix.