CVE-2021-32739

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 v3 8.8 HIGH
CVSS v2.0 6.5 MEDIUM

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.5^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:S/C:P/I:P/A:P

Exploitability : 8.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/Icinga/icinga2/security/advisories/GHSA-98wp-jc6q-x5q5	Exploit 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.html	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:icinga:icinga::::::::
	cpe:2.3:a:icinga:icinga::::::::

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-07-15 15:15

Updated : 2024-02-28 18:28

NVD link : CVE-2021-32739

Mitre link : CVE-2021-32739

CVE.ORG link : CVE-2021-32739

JSON object : View

Products Affected

icinga

icinga

debian

debian_linux

CWE

CWE-267

Privilege Defined With Unsafe Actions

CWE-269

Improper Privilege Management

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Desde versi\u00f3n 2.4.0 hasta versi\u00f3n 2.12.4, se presenta una vulnerabilidad que puede permitir una escalada de privilegios para usuarios autenticados de la API. Con las credenciales de un usuario de solo lectura, un atacante puede ver la mayor\u00eda de los atributos de todos los objetos de configuraci\u00f3n, incluyendo \"ticket_salt\" de \"ApiListener\". Este salt es suficiente para calcular un ticket para cada nombre com\u00fan (CN) posible. Un ticket, el certificado del nodo maestro y un certificado autofirmado son suficientes para solicitar con \u00e9xito el certificado deseado de Icinga. Ese certificado puede usarse a su vez para robar la identidad de un endpoint o de un usuario de la API. Las versiones 2.12.5 y 2.11.10 contienen una correcci\u00f3n de la vulnerabilidad. 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