CVE-2012-4355 in Winlog Pro
Summary
by MITRE
TCPIPS_Story.dll in Sielco Sistemi Winlog Pro SCADA before 2.07.18 and Winlog Lite SCADA before 2.07.18 allows remote attackers to execute arbitrary code via a port-46824 TCP packet with a crafted negative integer after the opcode, triggering incorrect function-pointer processing that can lead to a buffer overflow. NOTE: some of these details are obtained from third party information. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-4354.
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Analysis
by VulDB Data Team • 07/28/2025
The vulnerability described in CVE-2012-4355 represents a critical remote code execution flaw affecting Sielco Sistemi's Winlog Pro and Winlog Lite SCADA systems. This vulnerability specifically targets the TCPIPS_Story.dll component within these industrial control system implementations, which are widely deployed in critical infrastructure environments for monitoring and control operations. The affected versions prior to 2.07.18 contain a fundamental design flaw in their network protocol handling that creates an exploitable condition allowing remote attackers to execute arbitrary code on vulnerable systems. The vulnerability operates through a specific TCP packet structure transmitted over port 46824, which serves as the primary communication channel for these SCADA systems.
The technical root cause of this vulnerability stems from improper input validation within the function-pointer processing mechanism of the TCPIPS_Story.dll module. When a malicious TCP packet is received on port 46824, the system processes an opcode field followed by a crafted negative integer value. This negative integer value, when improperly handled, leads to incorrect function pointer dereferencing that ultimately results in a buffer overflow condition. The flaw demonstrates characteristics consistent with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which addresses heap-based buffer overflow scenarios. The vulnerability's classification as a remote code execution flaw aligns with ATT&CK technique T1203, which covers "Exploitation for Client Execution" and represents a significant threat to operational technology environments where SCADA systems operate in isolated but critical network segments.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over affected SCADA systems that manage critical infrastructure operations. Industrial control systems running vulnerable versions of Winlog Pro or Winlog Lite could be compromised to manipulate process controls, disrupt operations, or serve as entry points for further attacks within the industrial network. The vulnerability's remote nature means that attackers do not require physical access or network proximity to exploit the flaw, making it particularly dangerous for critical infrastructure operators. Organizations utilizing these SCADA systems face significant risk of operational disruption, safety hazards, and potential security breaches that could affect manufacturing processes, utility operations, or other industrial functions. The incomplete fix for CVE-2012-4354, which was referenced in the vulnerability description, indicates that the original security patch failed to address all possible attack vectors, leaving the system exposed to similar exploitation techniques.
Security mitigations for this vulnerability should focus on immediate patching of affected systems to version 2.07.18 or later, which contains the proper fix for both CVE-2012-4354 and CVE-2012-4355. Network segmentation and access controls should be implemented to restrict access to port 46824, particularly in production environments where these SCADA systems operate. Additional protective measures include implementing network monitoring to detect anomalous TCP packet patterns on the affected port, deploying intrusion detection systems specifically configured to identify exploitation attempts, and establishing strict access controls for system administration interfaces. Organizations should also conduct comprehensive vulnerability assessments of their industrial control system environments to identify other potentially vulnerable components that may share similar architectural flaws. The vulnerability highlights the importance of proper input validation and memory management in industrial control system software development, as well as the necessity of thorough security testing before deploying critical infrastructure software in operational environments.