Icinga 2 is an open source monitoring system. Prior to 2.14.9, 2.15.4, and 2.16.2, parsing deeply nested JSON can exhaust the call stack because nesting depth is not bounded. The affected JSON parsing paths are reachable by unauthenticated network clients through the Icinga 2 service on TCP port 5665, allowing a remote attacker to crash the process, while possible code execution has not been demonstrated.
This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 10
https://github.com/Icinga/icinga2/commit/391504eaa9ed9aee81f84008c57ec821974b74…
security-advisories@github.com
https://github.com/Icinga/icinga2/commit/3d9166ff52ff1a64a286c39af57957d63442c1…
security-advisories@github.com
https://github.com/Icinga/icinga2/commit/4964d2444ca5c4fae9036054554e1c6e0025fb…
security-advisories@github.com
https://github.com/Icinga/icinga2/commit/ed163a8aa9d296820dd2ad14c47bf3f6a3fcce…
security-advisories@github.com
https://github.com/Icinga/icinga2/pull/10908
security-advisories@github.com
https://github.com/Icinga/icinga2/releases/tag/v2.14.9
security-advisories@github.com
https://github.com/Icinga/icinga2/releases/tag/v2.15.4
security-advisories@github.com
https://github.com/Icinga/icinga2/releases/tag/v2.16.2
security-advisories@github.com
https://github.com/Icinga/icinga2/security/advisories/GHSA-wh38-wg57-5w7g
security-advisories@github.com
https://icinga.com/blog/icinga2-security-release-v2-16-2
security-advisories@github.com