CVE-2024-21510

Name of the Vulnerable Software and Affected Versions sinatra versions 0.0.0 and later

Description The issue is related to Reliance on Untrusted Inputs in a Security Decision via the X-Forwarded-Host header. When making a request to a method with redirect applied, it is possible to trigger an Open Redirect Attack by inserting an arbitrary address into this header. If used for caching purposes, such as with servers like Nginx, or as a reverse proxy, without handling the X-Forwarded-Host header, attackers can potentially exploit Cache Poisoning or Routing-based SSRF.

Recommendations For sinatra versions 0.0.0 and later, consider handling the X-Forwarded-Host header properly to prevent exploitation. As a temporary workaround, restrict access to the vulnerable module or function that processes the X-Forwarded-Host header until a patch is available. Additionally, avoid using the X-Forwarded-Host header for security decisions without proper validation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.