CVE-2023-25181
📋 TL;DR
This CVE describes a heap-based buffer overflow vulnerability in Weston Embedded uC-HTTP v3.01.01's HTTP server functionality. Attackers can send specially crafted network packets to trigger arbitrary code execution, potentially leading to complete system compromise. Any system running the vulnerable version of uC-HTTP with HTTP server functionality enabled is affected.
💻 Affected Systems
- Weston Embedded uC-HTTP
📦 What is this software?
Cesium Net by Weston Embedded
Uc Http by Weston Embedded
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root/admin privileges, data exfiltration, persistent backdoor installation, and lateral movement within the network.
Likely Case
Remote code execution leading to service disruption, data theft, or ransomware deployment on vulnerable systems.
If Mitigated
Denial of service or application crash if exploit attempts are blocked by network controls or memory protections.
🎯 Exploit Status
Public exploit details available in Talos reports. Network-based attack requires no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v3.01.02 or later
Vendor Advisory: https://www.weston-embedded.com/security-advisories
Restart Required: Yes
Instructions:
1. Contact Weston Embedded for updated uC-HTTP library version 3.01.02 or later. 2. Replace vulnerable library files with patched versions. 3. Recompile and redeploy applications using uC-HTTP. 4. Restart affected systems.
🔧 Temporary Workarounds
Network Segmentation
allIsolate systems running uC-HTTP from untrusted networks using firewalls or VLANs.
Disable HTTP Server
allIf HTTP functionality is not required, disable the HTTP server component in uC-HTTP configuration.
🧯 If You Can't Patch
- Implement strict network access controls to limit traffic to uC-HTTP systems only from trusted sources.
- Deploy intrusion prevention systems (IPS) with rules to detect and block exploit attempts targeting this vulnerability.
🔍 How to Verify
Check if Vulnerable:
Check uC-HTTP library version in your application. If version is exactly 3.01.01 and HTTP server is enabled, system is vulnerable.Check Version:
Check application build configuration or contact device manufacturer for version information.Verify Fix Applied:
Verify uC-HTTP library version is 3.01.02 or later and confirm HTTP server functionality still works as expected.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP request patterns
- Application crashes or restarts
- Memory allocation errors in system logs
Network Indicators:
- Malformed HTTP packets targeting uC-HTTP systems
- Unusual outbound connections from embedded devices
SIEM Query:
source="network_traffic" AND (http_user_agent CONTAINS "malicious_pattern" OR http_request_size > threshold)