CVE-2024-14028 Overview
A use after free vulnerability has been identified in the Softing smartLink HW-DP and smartLink HW-PN webserver components. This memory corruption flaw allows attackers to trigger a Denial of Service (DoS) condition via specially crafted HTTP requests. The vulnerability stems from improper memory management in the embedded webserver, where memory is accessed after being freed.
Critical Impact
Successful exploitation of this vulnerability could render affected industrial automation gateway devices unresponsive, potentially disrupting critical operational technology (OT) environments and industrial communication protocols.
Affected Products
- Softing smartLink HW-DP: through version 1.31
- Softing smartLink HW-PN: versions before 1.02
Discovery Timeline
- 2026-03-27 - CVE CVE-2024-14028 published to NVD
- 2026-03-30 - Last updated in NVD database
Technical Details for CVE-2024-14028
Vulnerability Analysis
This vulnerability is classified as CWE-416 (Use After Free), a memory corruption vulnerability that occurs when a program continues to use a pointer after the memory it references has been freed. In the context of the Softing smartLink webserver, the flaw exists in the HTTP request handling mechanism.
When processing certain HTTP requests, the webserver fails to properly track memory allocation states, leading to a condition where deallocated memory is subsequently accessed. This creates an unstable state that can be exploited by remote attackers to crash the service, resulting in denial of service conditions.
The vulnerability requires network access and user interaction to exploit. An attacker must send specially crafted HTTP requests to the vulnerable webserver endpoint. While the attack does not compromise data confidentiality or integrity, it has a high impact on system availability.
Root Cause
The root cause lies in improper memory lifecycle management within the embedded webserver component. Specifically, memory associated with HTTP request handling is freed prematurely or its reference is not properly nullified after deallocation. Subsequent operations that attempt to access this freed memory trigger undefined behavior, typically resulting in a crash or service disruption.
Attack Vector
The attack vector is network-based, requiring an attacker to send malicious HTTP requests to the affected smartLink device's webserver interface. The attack requires some form of user interaction, which could involve an operator accessing a malicious link that triggers the crafted HTTP request to the device. Once the vulnerability is triggered, the webserver becomes unresponsive, denying legitimate users access to the device management interface and potentially affecting industrial communication operations.
The vulnerability affects the availability of the system without impacting the confidentiality or integrity of data. This is particularly concerning in industrial environments where device availability is critical for maintaining operational continuity.
Detection Methods for CVE-2024-14028
Indicators of Compromise
- Unexpected crashes or restarts of Softing smartLink HW-DP or HW-PN devices
- Webserver interface becoming unresponsive or inaccessible
- Anomalous HTTP traffic patterns targeting smartLink device management ports
- Memory-related error logs in device diagnostics (if available)
Detection Strategies
- Monitor network traffic for unusual HTTP request patterns targeting smartLink device interfaces
- Implement availability monitoring for smartLink devices to detect unexpected service interruptions
- Deploy network intrusion detection systems (NIDS) with rules to identify malformed HTTP requests
- Review device access logs for suspicious request sequences that may indicate exploitation attempts
Monitoring Recommendations
- Establish baseline availability metrics for all Softing smartLink devices in your environment
- Configure alerting for any unexpected device restarts or communication failures
- Implement network segmentation monitoring to detect unauthorized access attempts to OT network segments
- Enable logging on network firewalls protecting industrial automation gateways
How to Mitigate CVE-2024-14028
Immediate Actions Required
- Inventory all Softing smartLink HW-DP and HW-PN devices in your environment
- Verify current firmware versions and identify devices running vulnerable versions
- Restrict network access to smartLink device webserver interfaces to authorized personnel only
- Implement network segmentation to isolate industrial automation devices from untrusted networks
Patch Information
Softing has released security updates addressing this vulnerability. For smartLink HW-DP devices, update to a firmware version beyond 1.31. For smartLink HW-PN devices, update to version 1.02 or later. Detailed patch information is available through the Softing Security Advisory and the Softing Technical Advisory JSON.
Workarounds
- Restrict access to the webserver interface by implementing firewall rules that limit connections to trusted IP addresses only
- If the webserver interface is not required for operations, consider disabling it if the device firmware supports this configuration
- Place affected devices behind a reverse proxy or web application firewall (WAF) that can filter malicious HTTP requests
- Implement network segmentation to isolate OT devices from general enterprise networks
# Example firewall rule to restrict access to smartLink webserver (adjust IP and port as needed)
# Allow only trusted management workstation to access device webserver
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
