CVE-2021-32747

NameCVE-2021-32747
DescriptionIcinga Web 2 is an open source monitoring web interface, framework, and command-line interface. A vulnerability in which custom variables are exposed to unauthorized users exists between versions 2.0.0 and 2.8.2. Custom variables are user-defined keys and values on configuration objects in Icinga 2. These are commonly used to reference secrets in other configurations such as check commands to be able to authenticate with a service being checked. Icinga Web 2 displays these custom variables to logged in users with access to said hosts or services. In order to protect the secrets from being visible to anyone, it's possible to setup protection rules and blacklists in a user's role. Protection rules result in `***` being shown instead of the original value, the key will remain. Backlists will hide a custom variable entirely from the user. Besides using the UI, custom variables can also be accessed differently by using an undocumented URL parameter. By adding a parameter to the affected routes, Icinga Web 2 will show these columns additionally in the respective list. This parameter is also respected when exporting to JSON or CSV. Protection rules and blacklists however have no effect in this case. Custom variables are shown as-is in the result. The issue has been fixed in the 2.9.0, 2.8.3, and 2.7.5 releases. As a workaround, one may set up a restriction to hide hosts and services with the custom variable in question.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs991116

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
icingaweb2 (PTS)stretch2.4.1-1vulnerable
stretch (security)2.4.1-1+deb9u1vulnerable
buster, buster (security)2.6.2-3+deb10u1vulnerable
bullseye, sid2.8.2-2vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
icingaweb2sourceexperimental2.8.3-1~exp1
icingaweb2source(unstable)(unfixed)991116

Notes

[buster] - icingaweb2 <no-dsa> (Minor issue)
[stretch] - icingaweb2 <no-dsa> (Minor issue)
https://github.com/Icinga/icingaweb2/security/advisories/GHSA-2xv9-886q-p7xx
https://github.com/Icinga/icingaweb2/commit/ffe8741c66af6ea085514a35ec878093b991875c (v2.8.3)

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