CyberSecBulletin
CVE-2024-49369NVD status: Analyzed

icinga2: Improper Certificate Validation

Published Updated By the CyberSecBulletin desk

CVE-2024-49369 is a critical-severity improper certificate validation vulnerability in icinga2 from Icinga, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected icinga2 versions: >= 2.4.0, < 2.11.12; >= 2.12.0, < 2.12.11; >= 2.13.0, < 2.13.10, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 2.94% chance of exploitation within 30 days, higher than 87% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update icinga_web_2 to 2.11.12 or 2.12.11 or 2.13.10 or 2.14.3, whichever matches your release line, or a later version.
  2. Update Icinga to 2.11.12 or 2.12.11 or 2.13.10 or 2.14.3, whichever matches your release line, or a later version.
  3. Read the advisory on github.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Icingaicinga2>= 2.4.0, < 2.11.12; >= 2.12.0, < 2.12.11; >= 2.13.0, < 2.13.10; >= 2.14.0, < 2.14.3Not stated
Icingaicinga_web_22.4.0 up to, but not including, 2.11.12; 2.12.0 up to, but not including, 2.12.11; 2.13.0 up to, but not including, 2.13.10; 2.14.0 up to, but not including, 2.14.32.11.12, 2.12.11, 2.13.10, 2.14.3
IcingaIcinga2.4.0 up to, but not including, 2.11.12; 2.12.0 up to, but not including, 2.12.11; 2.13.0 up to, but not including, 2.13.10; 2.14.0 up to, but not including, 2.14.32.11.12, 2.12.11, 2.13.10, 2.14.3
DebianDebian Linux11.0Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (github.com).

Official description

Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. The TLS certificate validation in all Icinga 2 versions starting from 2.4.0 was flawed, allowing an attacker to impersonate both trusted cluster nodes as well as any API users that use TLS client certificates for authentication (ApiUser objects with the client_cn attribute set). This vulnerability has been fixed in v2.14.3, v2.13.10, v2.12.11, and v2.11.12.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Certificate Validation

The product does not validate, or incorrectly validates, a certificate.

How developers prevent this class of flaw

  • Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
  • If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.

More Improper Certificate Validation vulnerabilities (CWE-295)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in icinga2

All icinga2 vulnerabilities

Recent Improper Certificate Validation vulnerabilities

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