GHSA-3244-8mff-w398 Reflected XSS in Gotify's /docs via import of outdated Swagger UI
Reflected XSS in Gotify's Swagger UI allows attackers to execute arbitrary JavaScript and potentially take over user accounts via malicious links.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is GHSA-3244-8mff-w398?
GHSA-3244-8mff-w398 is a cross-site scripting vulnerability in github.com/gotify/server, published on 10 Jan 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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Gotify exposes an outdated instance of the Swagger UI API documentation frontend at /docs which is susceptible to reflected XSS attacks when loading external Swagger config files.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
Which versions are affected by GHSA-3244-8mff-w398?
4 open source packages ship an affected version, including github.com/gotify/server and github.com/gotify/server/v2.
| Package | Affected | Fixed in |
|---|---|---|
github.com/gotify/server Go | All versions | None |
github.com/gotify/server Go | All versions | 2.2.3 |
github.com/gotify/server Go | All versions | 2.2.3 |
github.com/gotify/server/v2 Go | All versions | 2.2.3 |
How do I fix GHSA-3244-8mff-w398?
Upgrade github.com/gotify/server to 2.2.3 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is GHSA-3244-8mff-w398 being exploited?
There is no known exploitation of GHSA-3244-8mff-w398 in the wild and no public exploit code.
Sources
Also known as GO-2023-1471.