Vulnerability in Ratpack
CVE-2021-29479
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.009 (56.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Ratpack — versions < 1.9.0
- Ratpack Project
Weakness classification (CWE)
References
- portswigger.net/web-security/web-cache-poisoning (Exploit, Third Party Advisory)
- github.com/ratpack/ratpack/security/advisories/GHSA-w6rq-6h34-vh7q (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-29479?
- CVE-2021-29479 is a high-severity vulnerability in Ratpack, classified under CWE-807. CVSS score: 7.0/10. Published 2021-06-29.
- How severe is CVE-2021-29479?
- High severity. CVSS v3 base score is 7.0 out of 10.