Description
Simple Machines Forum 2.1 prior to commit b4d23df (fixed in 2.1.8) and 3.0 prior to commit 4bf35cf contains a server-side request forgery vulnerability in the image proxy that allows authenticated attackers to trigger internal HTTP requests by embedding attacker-controlled URLs in BBCode image tags, which the proxy fetches without validating resolved destination IPs against private address ranges, loopback, or link-local addresses. Attackers can leverage SMF's automatic HMAC signature generation for any embedded image URL to obtain valid signed proxy requests targeting internal services such as cloud instance metadata endpoints, internal web applications, and container network services.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
SimpleMachines SMF
Default version status: unaffected
2.1.0 to < 2.1.8affected2.1.8unaffectedb4d23dfd74a511587c605f9d294cefc3a75b4b26unaffected3.0.0-alpha.1 to ≤ 3.0.0-alpha.4affected4bf35cf9e45573a5f55a6f52995086c1da89c096unaffected
pkg:github/SimpleMachines/SMF