Full Report
Phishing, malvertising attacks could target devs to gain access to private corporate networks
Analysis Summary
# Vulnerability: Ray Framework Remote Code Execution via Browser-Based Phishing
## CVE Details
- **CVE ID:** CVE-2025-62593
- **CVSS Score:** 9.4 (Critical)
- **CWE:** Not explicitly stated, likely related to CWE-352 (Cross-Site Request Forgery) or CWE-912 (Unauthenticated Access).
## Affected Systems
- **Products:** Ray (Open source distributed computing framework)
- **Versions:** All versions prior to v2.52.0.
- **Configurations:** Developers running Ray in local development or testing environments; Ray instances running inside private corporate networks without external authentication.
## Vulnerability Description
The vulnerability stems from a lack of authentication on critical Ray endpoints and a flawed security check. Ray attempted to block browser-based requests by checking if the `User-Agent` header began with "Mozilla." However, browsers like Firefox and Safari allow scripts using the Fetch API to modify this header.
By leveraging **DNS rebinding**, an attacker can bypass the Same-Origin Policy (SOP). When a developer visits a malicious website or is served a "malvertisement," the browser acts as a "confused deputy," allowing the attacker to send requests to the local Ray service or network-adjacent Ray instances. This results in the execution of arbitrary shell code on the victim's machine or within the corporate network.
## Exploitation
- **Status:** **Exploited in the wild** (CISA has added this to the KEV catalog with a mandated 3-day fix window).
- **Complexity:** Low (Triggered via visiting a website or viewing an ad).
- **Attack Vector:** Network (Web-based/Phishing).
## Impact
- **Confidentiality:** High (Full access to private corporate networks and developer machines).
- **Integrity:** High (Arbitrary shell code execution).
- **Availability:** High (Potential for system takeover or ransomware deployment).
## Remediation
### Patches
- **Ray v2.52.0**: This version contains the fix for the flaw. Users should update immediately.
### Workarounds
- **Enable Token Authentication:** Ray v2.52.0 introduced optional token-based authentication (disabled by default). Users should manually enable this.
- **Network Isolation:** Ensure Ray clusters are deployed strictly within controlled, isolated networks. Do not expose Ray dashboards or ports to the open internet.
## Detection
- **Indicators of Compromise:**
- Unusual outbound network traffic from developer workstations.
- Unexpected shell commands or processes spawned by the Ray worker or head nodes.
- DNS rebinding attempts in network logs.
- **Detection methods and tools:**
- Monitor for modified `User-Agent` headers in HTTP requests targeting Ray ports (typically 8265 for the dashboard).
- Use EDR (Endpoint Detection and Response) tools to monitor developer machines for unauthorized RCE activities.
## References
- **Vendor Advisory:** hxxps[://]github[.]com/ray-project/ray/security/advisories/GHSA-q279-jhrf-cc6v
- **CISA Directive:** hxxps[://]www[.]cisa[.]gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- **Anyscale Blog:** hxxps[://]www[.]anyscale[.]com/blog/ray-by-anyscale-joins-pytorch-foundation