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cvelistGitHub_MCVELIST:CVE-2021-32739
HistoryJul 15, 2021 - 2:55 p.m.

CVE-2021-32739 Results of queries for ApiListener objects include the ticket salt which allows in turn to steal (more privileged) identities

2021-07-1514:55:11
CWE-267
GitHub_M
www.cve.org
11
icinga
vulnerability
privilege escalation
apilistener
ticket salt
version 2.4.0
version 2.12.4
version 2.12.5
version 2.11.10

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

8.9

Confidence

High

EPSS

0.006

Percentile

78.4%

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.

CNA Affected

[
  {
    "product": "icinga2",
    "vendor": "Icinga",
    "versions": [
      {
        "status": "affected",
        "version": ">= 2.4.0, <= 2.12.4"
      }
    ]
  }
]

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

8.9

Confidence

High

EPSS

0.006

Percentile

78.4%