CVE-2021-29479

Date: June 29, 2021

Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, a user supplied "X-Forwarded-Host" header can be used to perform cache poisoning of a cache fronting a Ratpack server if the cache key does not include the "X-Forwarded-Host" header as a cache key. Users are only vulnerable if they do not configure a custom "PublicAddress" instance. For versions prior to 1.9.0, by default, Ratpack utilizes an inferring version of "PublicAddress" which is vulnerable. This can be used to perform redirect cache poisoning where an attacker can force a cached redirect to redirect to their site instead of the intended redirect location. The vulnerability was patched in Ratpack 1.9.0. As a workaround, ensure that "ServerConfigBuilder::publicAddress" correctly configures the server in production.

Language: Java