GHSA-hq8w-9w8w-pmx7

### Impact WireMock can be configured to only permit proxying (and therefore recording) to certain addresses. This is achieved via a list of allowed address rules and a list of denied address rules, where the allowed list is evaluated first. [Documentation](https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses). Until WireMock Webhooks Extension [3.0.0-beta-15](https://github.com/wiremock/wiremock/releases/tag/3.0.0-beta-15), the filtering of target addresses from the proxy mode DID NOT work for Webhooks, so the users were potentially vulnerable regardless of the `limitProxyTargets` settings. Via the WireMock webhooks configuration, POST requests from a webhook might be forwarded to an arbitrary service reachable from WireMock’s instance. For example, If someone is running the WireMock docker Container inside a private cluster, they can trigger internal POST requests against unsecured APIs or even against secure ones by passing a token, discovered using another exploit, via authentication headers. ### Affected components - WireMock Webhooks Extension 2.x versions until 2.35.1 (security patch) - WireMock 3.x version until 3.0.3 (security patch) - All versions of WireMock Studio (discontinued). This distribution bundles the WireMock Webhooks Extension and activates it by default ### Patches and Mitigation - For WireMock 2.x and 3.x - upgrade to the versions with the security patches - Setup network restrictions similarly to https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses - For WireMock Studio: Stop using discontinued WireMock Studio, migrate to other distributions. The vendor of WireMock Studio recommends migration to [WireMock Cloud](https://www.wiremock.io/product) NOTE: It was confirmed that [WireMock Cloud](https://www.wiremock.io/product) does not expose sensitive internal APIs and hence not vulnerable to the issue. No action is needed if you use this SaaS distribution. ### Workarounds - Use external firewall rules to define the list of permitted destinations ### References - CVE-2023-39967 - [Preventing proxying to and recording from specific target addresses](https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses) ### Credits - @W0rty for reporting CVE-2023-39967 in WireMock Studio - WireMock Inc. team for discovering similar exploits in Webhooks and the risk in the Proxy mode defaults for WireMock