Icinga 2 v2.15.6

This release contains some security enhancements that fix a couple of minor vulnerabilities.

One vulnerability allowed an authenticated ApiUser with the events/* permission to obtain information about objects through crafted filter expressions, without holding the relevant objects/query/* permission. The fix is to correctly apply permissions to filter expressions on /v1/events.

The other vulnerability allowed an authenticated Icinga 2 node to use the ~1 GB message limit to possibly crash another node through memory exhaustion. Depending on available memory, multiple compromised nodes may be required for a successful attack since a node can only make one connection. The fix applies a 16 MiB limit to messages from nodes lower in the hierarchy.

Security Enhancements

• Apply user permissions to filter expressions for /v1/events similarly to /v1/objects (GHSA-v265-w3gm-99vg)
• Introduce an additional 16 MiB message size limit on all child-zone connections (GHSA-wm63-p2jg-5665)
• Don't include sensitive certificate request tickets in log messages (#10987)
• Don't log full object config containing potentially sensitive information (#10989)