The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3953 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3953-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Daniel Leidert     November 16, 2024                             https://wiki.debian.org/LTS
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    Package        : icinga2     Version        : 2.12.3-1+deb11u1     CVE ID         : CVE-2021-32739 CVE-2021-32743 CVE-2021-37698 CVE-2024-49369     Debian Bug     : 991494 1087384

    Icinga 2 is a general-purpose monitoring application to fit the needs     of any size of network.

    CVE-2021-32739

        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-only 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.

    CVE-2021-32743

        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. An attacker who obtains these credentials can impersonate         Icinga to these services and add, modify and delete information there.

    CVE-2021-37698

        In versions 2.5.0 through 2.13.0, ElasticsearchWriter, GelfWriter,         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 change the credentials (if any)         used by the TSDB writer feature to authenticate against the TSDB.

    CVE-2024-49369

        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).

    For Debian 11 bullseye, these problems have been fixed in version     2.12.3-1+deb11u1.

    We recommend that you upgrade your icinga2 packages.

    For the detailed security status of icinga2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/icinga2

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
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Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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Debian dla-3953 : icinga2 - security update

high Nessus Plugin ID 211508

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