Security context

What an agent needs to avoid regressing past fixes and find the next vuln in this repo.

ncr/rack-proxy

              master @ 4b01492
            

Fixes

CVEs

HIGH

Peak severity

100.0%

Coverage

Highlights

Denial of Service: 7 prior fixes. Scrutinize any change in this area.

lib/rack/proxy.rb: most-fixed (13 issues). Treat as high-risk during review.

7 high-severity fixes in this history; regressions here are high-impact.

Recurring patterns

The bug types that recur here, drawn from past fixes, not open vulnerabilities.

Insecure TLS Configuration: The proxy historically defaulted its SSL verification mode to VERIFY_NONE, meaning downstream requests were silently forwarded over unverified TLS connections, rendering the system vulnerable to MITM attacks.

Remote Code Execution: The application dynamically resolved HTTP request classes using unsanitized string inputs via Ruby's `Module#const_get` without disabling ancestor lookup, allowing arbitrary constant instantiation and potential remote code execution.

Denial of Service: Several crash vectors existed where malformed backend responses (nil bodies, missing content-length headers, or missing header hashes) threw unhandled NoMethodError exceptions, bringing down the Rack middleware worker.