CVE-2021-32747: Custom variable protection and blacklists can be circumvented
First published: Mon Jul 12 2021(Updated: )
Icinga 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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Icinga Icinga | >=2.0.0<2.7.5 | |
| Icinga Icinga | >=2.8.0<2.8.3 |
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Reference Links
Frequently Asked Questions
What is the vulnerability CVE-2021-32747 in Icinga Web 2?
The vulnerability CVE-2021-32747 in Icinga Web 2 is an exposure of custom variables to unauthorized users.
What is the severity of CVE-2021-32747 in Icinga Web 2?
The severity of CVE-2021-32747 in Icinga Web 2 is medium with a CVSS score of 6.5.
Which versions of Icinga Web 2 are affected by CVE-2021-32747?
Versions 2.0.0 to 2.7.5 and versions 2.8.0 to 2.8.2 of Icinga Web 2 are affected by CVE-2021-32747.
How can I fix the vulnerability CVE-2021-32747 in Icinga Web 2?
To fix the vulnerability CVE-2021-32747 in Icinga Web 2, you should upgrade to version 2.7.5, 2.8.3, or a later release.
What is CWE-200 related to CVE-2021-32747 in Icinga Web 2?
CWE-200, or Information Exposure, is the type of weakness related to CVE-2021-32747 in Icinga Web 2.
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