GHSA-xxhq-69mf-w8cr

Описание

Summary

An open redirect vulnerability exists in Gogs where attacker-controlled redirect_to parameters can bypass validation, allowing redirection to arbitrary external sites.

Details

All redirects in Gogs that are validated via the IsSameSite function are vulnerable:

The function only inspects the first two characters of the URL string. This check fails to account for directory traversal sequences followed by backslashes. For example:

The IsSameSite function checks the input supplied to the redirect_to query parameter value /a/../\example.com and considers it valid.

Because web browsers normalize backslashes \ to forward slashes /, the normalized URL becomes //example.com.

The normalized URL becomes:

Resulting in a cross-origin redirect.

This affects all endpoints using the redirect_to query parameter, including login and other post-action flows.

PoC

1. An attacker can provide a user with a link to login to Gogs with a redirect_to query parameter that redirects a user to a site the attacker wants them to visit:

2. After the user successfully logs in, they would be redirected to the site an attacker wants them to visit:

Impact

• Phishing: Attackers can use trusted domain links to redirect victims to credential-harvesting pages
• OAuth/SSO Token Theft: In authentication flows, authorization codes or tokens may leak via redirect
• Referer Leakage: Sensitive URL parameters may be exposed to attacker domains via the Referer header
• Cache Poisoning: In deployments with shared caches, malicious redirects may be cached and served to other users