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.
Published 2021-07-12 23:15:08
Updated 2021-07-15 17:20:03
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: Information leak

Threat overview for CVE-2021-32747

Top countries where our scanners detected CVE-2021-32747
Top open port discovered on systems with this issue 80
IPs affected by CVE-2021-32747 3
Threat actors abusing to this issue? Yes
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Exploit prediction scoring system (EPSS) score for CVE-2021-32747

0.10%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 42 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-32747

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.0
MEDIUM AV:N/AC:L/Au:S/C:P/I:N/A:N
8.0
2.9
NIST
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.8
3.6
NIST
5.3
MEDIUM CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
1.6
3.6
GitHub, Inc.

CWE ids for CVE-2021-32747

References for CVE-2021-32747

Products affected by CVE-2021-32747

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