Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS0zMjQ0LThtZmYtdzM5OM4AAw3d

Reflected XSS in Gotify's /docs via import of outdated Swagger UI

Impact

Gotify exposes an outdated instance of the Swagger UI API documentation frontend at /docs which is susceptible to reflected XSS attacks when loading external Swagger config files.

Specifically, the DOMPurify version included with this version of Swagger UI is vulnerable to a rendering XSS incorporating the mutation payload detailed in CVE-2020-26870 which was patched in 2021. This is further tracked in the GitHub Advisory Database as GHSA-QRMM-W75W-3WPX.

An attacker can execute arbitrary JavaScript and potentially take over the account of the user that clicked the link. Keep in mind, the Gotify UI won't natively expose such a malicious link, so an attacker has to get the user to open the malicious link in a context outside of Gotify.

Patches

The vulnerability has been fixed in version 2.2.3.

References

https://github.com/gotify/server/pull/541

Permalink: https://github.com/advisories/GHSA-3244-8mff-w398
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0zMjQ0LThtZmYtdzM5OM4AAw3d
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 1 year ago
Updated: about 1 year ago

Identifiers: GHSA-3244-8mff-w398
References:

• https://github.com/gotify/server/security/advisories/GHSA-3244-8mff-w398
• https://github.com/gotify/server/pull/541
• https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/
• https://www.vidocsecurity.com/blog/hacking-swagger-ui-from-xss-to-account-takeovers/
• https://github.com/advisories/GHSA-3244-8mff-w398

Repository: https://github.com/gotify/server
Blast Radius: 0.0

Affected Packages