Directory Traversal in Ruby on Rails (CVE‑2016‑0752) Allows Remote File Read
What It Is — A directory‑traversal flaw in Action View permits an unauthenticated attacker to read arbitrary files on the server.
Exploitability — Publicly disclosed; proof‑of‑concept code exists; CVSS v3 base score 7.5 (High).
Affected Products — Ruby on Rails framework versions prior to 4.2.5.1 and 5.0.0 (as listed in the CISA KEV advisory).
Why It Matters for Trust & Control Assurance
- Demonstrates the need for continuous validation of third‑party component inventories and patch status – a core control for maintaining a defensible audit trail.
- Highlights gaps in file‑access authorization controls; evidence of remediation can be captured and presented to auditors.
- Enterprise buyers increasingly require proof that application libraries are kept up‑to‑date, tying directly to the control objective “Secure Configuration Management”.
Recommended Actions
- Identify all Rails instances and verify they run a patched version (≥ 4.2.5.1 or ≥ 5.0.0).
- Apply vendor patches or upgrade to supported releases.
- Implement automated dependency scanning and continuous monitoring to surface vulnerable libraries.
- Add strict file‑path validation controls and log any access attempts to sensitive directories.
- Document remediation steps as evidence for compliance audits.
Source: CISA KEV – CVE‑2016‑0752