جزئیات آسیب‌پذیری

FreshRSS is a self-hosted RSS feed aggregator. Prior to version 1.26.2, when the server is using HTTP auth via reverse proxy, it's possible to impersonate any user either via the `Remote-User` header or the `X-WebAuth-User` header by making specially crafted requests via the add feed functionality and obtaining the CSRF token via XPath scraping. The attacker has to know the IP address of the proxied FreshRSS instance and the admin's username, while also having an account on the instance. An attacker can send specially crafted requests in order to gain unauthorized access to internal services. This can also lead to privilege escalation like in the demonstrated scenario, although users that have setup OIDC are not affected by privilege escalation. Version 1.26.2 contains a patch for the issue.

• https://github.com/FreshRSS/FreshRSS/security/advisories/GHSA-w3m8-wcf4-h8vm x_refsource_CONFIRM
• https://github.com/FreshRSS/FreshRSS/commit/6bb8680ae0051b9a2ff344f17814f4fa5d844628 x_refsource_MISC