CVE-2021-29479
Users are only vulnerable if they do not configure a custom `PublicAddress` instance.
Does this matter?
Lower severity and a low EPSS score (0.86%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.86% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-807
- Affected
- ratpack project/ratpack
- Source
- security-advisories@github.com
References
- https://github.com/ratpack/ratpack/security/advisories/GHSA-w6rq-6h34-vh7qThird Party Advisory
- https://portswigger.net/web-security/web-cache-poisoningExploit, Third Party Advisory
- https://github.com/ratpack/ratpack/security/advisories/GHSA-w6rq-6h34-vh7qThird Party Advisory
- https://portswigger.net/web-security/web-cache-poisoningExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.