GHSA-3244-8mff-w398
Reflected XSS in Gotify's /docs via import of outdated Swagger UI
Quick fix
GHSA-3244-8mff-w398 — github.com/gotify/server: upgrade to the fixed version with the command below.
go get github.com/gotify/server@v2.2.3Details
### Impact
Gotify exposes an outdated instance of the [Swagger UI](https://swagger.io/tools/swagger-ui/) API documentation frontend at `/docs` which is susceptible to reflected XSS attacks when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](https://www.vidocsecurity.com/blog/hacking-swagger-ui-from-xss-to-account-takeovers/) incorporating the mutation payload detailed in [CVE-2020-26870](https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/) 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
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Affected packages
References
- https://github.com/gotify/server/security/advisories/GHSA-3244-8mff-w398[WEB]
- https://github.com/gotify/server/pull/541[WEB]
- https://github.com/gotify/server[PACKAGE]
- https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass[WEB]
- https://www.vidocsecurity.com/blog/hacking-swagger-ui-from-xss-to-account-takeovers[WEB]