CVE-2025-64427 Overview
CVE-2025-64427 is a Server-Side Request Forgery (SSRF) vulnerability affecting ZimaOS, a fork of CasaOS designed for Zima devices and x86-64 systems with UEFI. The vulnerability stems from insufficient validation or restriction of target URLs, allowing an authenticated local user to craft malicious requests targeting internal IP addresses such as 127.0.0.1, localhost, or private network ranges. This enables attackers to interact with internal HTTP/HTTPS services that are not intended to be exposed externally or to local users.
Critical Impact
Authenticated attackers can access internal services and potentially exfiltrate sensitive information from protected network resources that should not be accessible.
Affected Products
- ZimaSpace ZimaOS version 1.5.0 and prior
- Systems running ZimaOS on Zima devices
- x86-64 systems with UEFI running ZimaOS
Discovery Timeline
- 2026-03-02 - CVE-2025-64427 published to NVD
- 2026-03-05 - Last updated in NVD database
Technical Details for CVE-2025-64427
Vulnerability Analysis
This SSRF vulnerability exists due to the application's failure to properly validate or restrict user-supplied URLs before making server-side requests. When an authenticated user submits a request containing a URL, the ZimaOS application processes it without adequately checking whether the target address points to internal network resources. The vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), as it can lead to unauthorized information disclosure from internal services.
The attack requires network access and low-privilege authentication, meaning an attacker must first have valid credentials to the ZimaOS system. Once authenticated, the attacker can craft requests that redirect the server to make connections to internal endpoints, effectively using the ZimaOS server as a proxy to reach otherwise inaccessible resources.
Root Cause
The root cause of CVE-2025-64427 lies in the absence of proper URL validation and filtering mechanisms within ZimaOS version 1.5.0 and earlier. The application fails to implement allowlists for permitted external domains or blocklists for internal IP ranges. This oversight allows user-controlled input to directly influence the destination of server-side HTTP/HTTPS requests without sanitization.
Specifically, the application does not:
- Validate that target URLs resolve to external, public IP addresses
- Block requests to loopback addresses (127.0.0.1, ::1, localhost)
- Prevent access to private network ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16)
- Implement URL scheme restrictions to prevent unexpected protocol usage
Attack Vector
The attack is executed over the network by an authenticated user with low privileges. The attacker leverages legitimate application functionality that accepts URL parameters to redirect requests to internal services. By targeting internal IP addresses, the attacker can:
- Probe internal network infrastructure to discover active services
- Access internal APIs or administrative interfaces not exposed to the network
- Retrieve sensitive configuration data or credentials from internal services
- Potentially pivot to other internal systems using the ZimaOS server as an intermediary
The vulnerability allows the attacker to interact with any HTTP/HTTPS service reachable from the ZimaOS server, including services bound only to localhost or internal network interfaces. For detailed technical information, refer to the GitHub Security Advisory GHSA-m8hj-7xg5-p375.
Detection Methods for CVE-2025-64427
Indicators of Compromise
- Unusual outbound requests from ZimaOS server to internal IP ranges (127.0.0.1, 10.x.x.x, 172.16.x.x, 192.168.x.x)
- HTTP/HTTPS requests to localhost ports from the ZimaOS application process
- Access logs showing requests to internal service endpoints originating from the ZimaOS server
- Unexpected connections to administrative interfaces or sensitive internal APIs
Detection Strategies
- Monitor network traffic for connections from the ZimaOS server to internal IP addresses that deviate from normal operational patterns
- Implement application-level logging to capture all URL parameters submitted by users and flag those targeting internal addresses
- Deploy network intrusion detection rules to alert on SSRF-like patterns such as requests to RFC 1918 addresses from web applications
- Review authentication logs for accounts making suspicious requests targeting internal resources
Monitoring Recommendations
- Enable verbose logging for all HTTP/HTTPS requests made by the ZimaOS application
- Set up alerts for any requests containing localhost, 127.0.0.1, or private IP ranges in URL parameters
- Implement network segmentation monitoring to detect unauthorized cross-segment traffic originating from ZimaOS
- Regularly audit access logs for patterns indicative of internal service enumeration or data exfiltration attempts
How to Mitigate CVE-2025-64427
Immediate Actions Required
- Restrict access to the ZimaOS interface to trusted users only until a patch is available
- Implement network-level controls to limit the ZimaOS server's ability to connect to internal services
- Review and audit user accounts with access to ZimaOS, removing unnecessary privileges
- Consider placing ZimaOS in a network segment with limited access to sensitive internal resources
Patch Information
No known patch is publicly available at this time. Users should monitor the ZimaOS GitHub Security Advisory for updates regarding security fixes. Until an official patch is released, implementing the workarounds below is strongly recommended.
Workarounds
- Deploy a web application firewall (WAF) or reverse proxy in front of ZimaOS to filter and block requests containing internal IP addresses
- Implement network segmentation to isolate the ZimaOS server from sensitive internal services
- Use firewall rules to prevent the ZimaOS server from initiating connections to internal network ranges
- Limit user authentication to only essential personnel who require access to the system
# Example iptables rules to restrict ZimaOS server outbound connections to internal networks
# Replace eth0 with your interface and adjust as needed for your environment
# Block connections to loopback from the ZimaOS process
iptables -A OUTPUT -d 127.0.0.0/8 -m owner --uid-owner zimaos -j DROP
# Block connections to private network ranges
iptables -A OUTPUT -d 10.0.0.0/8 -m owner --uid-owner zimaos -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -m owner --uid-owner zimaos -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -m owner --uid-owner zimaos -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
