Debian LTS: Security Advisory for icinga2 (DLA-2816-1)

Published: 2021-11-18 02:00:11
CVE Author: NIST National Vulnerability Database

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

Summary:
The remote host is missing an update for the 'icinga2' Linux Distribution Package(s) announced via the DLA-2816-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several vulnerabilities were discovered in Icinga 2, a general-purpose monitoring application. An attacker could retrieve sensitive information such as service passwords and ticket salt by querying the web API, or by intercepting unsufficiently checked encrypted connections. CVE-2021-32739 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. See also complementary manual procedures: CVE-2021-32743 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 exposes the password of the user used to connect to the database. 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. CVE-2021-37698 InfluxdbWriter and Influxdb2Writer do not verify the server's certificate despite a certificate authority being specified. Icinga 2 instances which connect to any of the mentioned time series databases (TSDBs) using TLS over a spoofable infrastructure should immediately upgrade. Such instances should also change the credentials (if any) used by the TSDB writer feature to authenticate against the TSDB.

Affected Versions:
'icinga2' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 9 stretch, these problems have been fixed in version 2.6.0-2+deb9u2. We recommend that you upgrade your icinga2 Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-32739
https://nvd.nist.gov/vuln/detail/CVE-2021-32743
https://nvd.nist.gov/vuln/detail/CVE-2021-37698

References:

https://lists.debian.org/debian-lts-announce/2021/11/msg00010.html
https://security-tracker.debian.org/tracker/DLA-2816-1

https://bugs.debian.org/991494

Severity
Medium
CVSS Score
6.5
Published
2021-11-18
Modified
2021-11-18
Category
Debian Local Security Checks

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