CVE-2021-32739
From version 2.4.0 through version 2.12.4, a vulnerability exists that may allow privilege escalation for authenticated API users.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. From version 2.4.0 through version 2.12.4, a vulnerability exists that may allow privilege escalation for authenticated API users. With a read-ony user's credentials, an attacker can view most attributes of all config objects including `ticket_salt` of `ApiListener`. This salt is enough to compute a ticket for every possible common name (CN). A ticket, the master node's certificate, and a self-signed certificate are enough to successfully request the desired certificate from Icinga. That certificate may in turn be used to steal an endpoint or API user's identity. Versions 2.12.5 and 2.11.10 both contain a fix the vulnerability. As a workaround, one may either specify queryable types explicitly or filter out ApiListener objects.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.14% probability · 65th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-267, CWE-269
- Affected
- icinga/icinga · debian/debian linux
- Source
- security-advisories@github.com
References
- https://github.com/Icinga/icinga2/security/advisories/GHSA-98wp-jc6q-x5q5Exploit, Third Party Advisory
- https://icinga.com/blog/2021/07/02/releasing-icinga-2-12-5-2-11-10/Broken Link, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00010.htmlMailing List, Third Party Advisory
- https://github.com/Icinga/icinga2/security/advisories/GHSA-98wp-jc6q-x5q5Exploit, Third Party Advisory
- https://icinga.com/blog/2021/07/02/releasing-icinga-2-12-5-2-11-10/Broken Link, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00010.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/11/msg00010.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.