CVE-2017-0905: SSRF in Recurly Client Ruby Library

The SSRF vulnerability in the Recurly Client Ruby Library allows an attacker to craft malicious requests through the Resource#find method. This can be exploited to make the application send requests to arbitrary URLs, potentially exposing internal services or resources that should not be publicly accessible. A successful exploitation could lead to the leakage of API keys, authentication tokens, or other sensitive data used by the Recurly integration. The impact is particularly severe because Recurly is often used to manage subscription billing, making compromised API keys a direct pathway to financial data and user accounts. This vulnerability shares similarities with other SSRF exploits where attackers leverage internal network access to gain unauthorized information.

1. Published2017-12-06
2. Modified2024-02-16
3. EPSS updated2026-04-02

The primary mitigation for CVE-2017-0905 is to upgrade the Recurly Client Ruby Library to version 2.3.10 or later. If upgrading is not immediately feasible due to compatibility issues or breaking changes, consider implementing input validation on the Resource#find method to restrict the URLs that can be accessed. Additionally, restrict network access for the application to only the necessary resources. Implement a Web Application Firewall (WAF) with SSRF protection rules to block suspicious requests. After upgrading, confirm the fix by attempting to trigger the Resource#find method with an external URL and verifying that the request is blocked or redirected.