CVE-2021-29479 – io.ratpack:ratpack-core

Package

Manager: maven
Name: io.ratpack:ratpack-core
Vulnerable Version: >=0 <1.9.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00225 pctl0.45219

Details

Cached redirect poisoning via X-Forwarded-Host header 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. A custom `PublicAddress` can be specified by using [ServerConfigBuilder::publicAddress](https://ratpack.io/manual/current/api/ratpack/server/ServerConfigBuilder.html#publicAddress-java.net.URI-). For versions prior to 1.9.0, by default, Ratpack utilizes an inferring version of `PublicAddress` which is vulnerable. ### Impact 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. ### Patches As of Ratpack 1.9.0, two changes have been made that mitigate this vulnerability: 1. The default PublicAddress implementation no longer infers the address from the request context, instead relying on the configured bind host/port 2. Relative redirects issued by the application are no longer absolutized; they are passed through as-is ### Workarounds In production, ensure that [ServerConfigBuilder::publicAddress](https://ratpack.io/manual/current/api/ratpack/server/ServerConfigBuilder.html#publicAddress-java.net.URI-) correctly configures the server. ### References - https://portswigger.net/web-security/web-cache-poisoning

Metadata

Created: 2021-07-01T17:02:38Z
Modified: 2021-09-01T19:32:52Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/07/GHSA-w6rq-6h34-vh7q/GHSA-w6rq-6h34-vh7q.json
CWE IDs: ["CWE-807"]
Alternative ID: GHSA-w6rq-6h34-vh7q
Finding: F089
Auto approve: 1