CVE-2021-32747
Icinga Web 2 Exposes Custom Variables to Unauthorized Users
Description
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.
INFO
Published Date :
July 12, 2021, 11:15 p.m.
Last Modified :
July 15, 2021, 5:20 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-32747.
| URL | Resource |
|---|---|
| https://github.com/Icinga/icingaweb2/releases/tag/v2.7.5 | Release Notes Third Party Advisory |
| https://github.com/Icinga/icingaweb2/releases/tag/v2.8.3 | Release Notes Third Party Advisory |
| https://github.com/Icinga/icingaweb2/releases/tag/v2.9.0 | Release Notes Third Party Advisory |
| https://github.com/Icinga/icingaweb2/security/advisories/GHSA-2xv9-886q-p7xx | Exploit Third Party Advisory |
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The following list is the news that have been mention
CVE-2021-32747 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32747 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jul. 15, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Changed Reference Type https://github.com/Icinga/icingaweb2/releases/tag/v2.7.5 No Types Assigned https://github.com/Icinga/icingaweb2/releases/tag/v2.7.5 Release Notes, Third Party Advisory Changed Reference Type https://github.com/Icinga/icingaweb2/releases/tag/v2.8.3 No Types Assigned https://github.com/Icinga/icingaweb2/releases/tag/v2.8.3 Release Notes, Third Party Advisory Changed Reference Type https://github.com/Icinga/icingaweb2/releases/tag/v2.9.0 No Types Assigned https://github.com/Icinga/icingaweb2/releases/tag/v2.9.0 Release Notes, Third Party Advisory Changed Reference Type https://github.com/Icinga/icingaweb2/security/advisories/GHSA-2xv9-886q-p7xx No Types Assigned https://github.com/Icinga/icingaweb2/security/advisories/GHSA-2xv9-886q-p7xx Exploit, Third Party Advisory Added CWE NIST CWE-200 Added CPE Configuration OR *cpe:2.3:a:icinga:icinga:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (excluding) 2.7.5 *cpe:2.3:a:icinga:icinga:*:*:*:*:*:*:*:* versions from (including) 2.8.0 up to (excluding) 2.8.3
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32747 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-32747
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.10 }} 0.02%
score
0.42090
percentile