CVE-2021-32743: Icinga vulnerability (CVSS 8.8)

Description

Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. In versions prior to 2.11.10 and from version 2.12.0 through version 2.12.4, some of the Icinga 2 features that require credentials for external services expose those credentials through the API to authenticated API users with read permissions for the corresponding object types. IdoMysqlConnection and IdoPgsqlConnection (every released version) exposes the password of the user used to connect to the database. IcingaDB (added in 2.12.0) exposes the password used to connect to the Redis server. ElasticsearchWriter (added in 2.8.0)exposes the password used to connect to the Elasticsearch server. An attacker who obtains these credentials can impersonate Icinga to these services and add, modify and delete information there. If credentials with more permissions are in use, this increases the impact accordingly. Starting with the 2.11.10 and 2.12.5 releases, these passwords are no longer exposed via the API. As a workaround, API user permissions can be restricted to not allow querying of any affected objects, either by explicitly listing only the required object types for object query permissions, or by applying a filter rule.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Icinga≥ 2.0.0 < 2.11.10 · ≥ 2.12.0 < 2.12.5

Debian Linux9.0

Remediation

Fixed in

Icinga≥ 2.11.10

Patch & vendor advisories

https://icinga.com/blog/2021/07/15/releasing-icinga-2-12-5-and-2-11-10/

References

https://github.com/Icinga/icinga2/security/advisories/GHSA-wrpw-pmr8-qgj7ExploitThird Party Advisory
https://icinga.com/blog/2021/07/15/releasing-icinga-2-12-5-and-2-11-10/ExploitVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00010.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/11/msg00010.html

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2021-32743 being actively exploited?

CVE-2021-32743 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.80%.

How severe is CVE-2021-32743?

CVE-2021-32743 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 1.80% probability of exploitation.

Which products are affected by CVE-2021-32743?

Affected products include Icinga, Debian Linux.

How do I fix CVE-2021-32743?

Upgrade affected software to a fixed version, for example Icinga 2.11.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-32743 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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