Fedify has an Infinite loop and Blind SSRF found inside the Webfinger mechanism
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.4epss 0.6%
exploitation probability
0.6%top 53% of all CVEs
observed exploitation
nono source reports it
Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards. This vulnerability allows a user to maneuver the Webfinger mechanism to perform a GET request to any internal resource on any Host, Port, URL combination regardless of present security mechanisms, and forcing the victim’s server into an infinite loop causing Denial of Service. Moreover, this issue can also be maneuvered into performing a Blind SSRF attack. This vulnerability is fixed in 1.0.14, 1.1.11, 1.2.11, and 1.3.4.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
Affected products
dahlia · fedifyReferences
https://github.com/dahlia/fedify/commit/8be3c2038eebf4ae12481683a1e809b314be3151https://github.com/dahlia/fedify/commit/c505eb82fcd6b5b17174c6659c29721bc801ab9ahttps://github.com/dahlia/fedify/commit/e921134dd5097586e4563ea80b9e8d1b5460a645https://github.com/dahlia/fedify/security/advisories/GHSA-c59p-wq67-24wx