CVE-2011-0517 in Winlog Pro
Summary
by MITRE
Stack-based buffer overflow in Sielco Sistemi Winlog Pro 2.07.00 and earlier, when Run TCP/IP server is enabled, allows remote attackers to cause a denial of service (crash) and execute arbitrary code via a crafted 0x02 opcode to TCP port 46823.
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Analysis
by VulDB Data Team • 12/01/2024
The vulnerability identified as CVE-2011-0517 represents a critical stack-based buffer overflow flaw affecting Sielco Sistemi Winlog Pro version 2.07.00 and earlier implementations. This vulnerability specifically manifests when the TCP/IP server functionality is enabled, creating an exploitable condition that remote attackers can leverage to compromise system integrity. The flaw occurs within the protocol handling mechanism for TCP port 46823, which serves as the primary communication channel for the affected software's network operations.
The technical exploitation of this vulnerability involves sending a specially crafted 0x02 opcode to the designated TCP port 46823, which triggers the buffer overflow condition in the software's memory management. This particular opcode sequence causes the application to write data beyond the boundaries of a predetermined stack buffer, leading to unpredictable behavior including program crashes and potential code execution. The buffer overflow vulnerability stems from insufficient input validation and bounds checking within the protocol parser, allowing malicious data to overwrite adjacent memory locations including return addresses and control data structures.
From an operational impact perspective, this vulnerability creates significant security risks for industrial control systems and process automation environments where Sielco Winlog Pro is deployed. The remote code execution capability means that attackers can potentially gain full system control, install backdoors, modify operational parameters, or disrupt critical processes that depend on the affected software. The denial of service component further compounds the risk by allowing attackers to intentionally crash the application, potentially causing operational disruptions in industrial environments where continuous operation is essential. The vulnerability affects systems where the TCP/IP server is enabled, which is often a required configuration for remote monitoring and control capabilities in industrial settings.
The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which is categorized under the Common Weakness Enumeration framework as a fundamental memory safety issue. This weakness type specifically addresses buffer overflows that occur in stack memory regions, where the overflow corrupts the program's execution flow by overwriting stack data including return addresses and local variables. From an attack methodology standpoint, this vulnerability maps to several ATT&CK techniques including T1203 Exploitation for Client Execution and T1499 Endpoint Denial of Service, demonstrating how attackers can leverage such flaws to achieve both persistent access and operational disruption.
Mitigation strategies for this vulnerability should begin with immediate patching of affected systems to the latest available versions of Sielco Winlog Pro that address the buffer overflow condition. Network segmentation and access controls should be implemented to restrict access to TCP port 46823 to only authorized systems and users, effectively reducing the attack surface. Additionally, implementing network monitoring and intrusion detection systems can help identify and alert on suspicious opcode sequences targeting this specific vulnerability. Organizations should also conduct comprehensive vulnerability assessments to identify all instances of the affected software within their industrial control systems and ensure proper network architecture design that isolates critical systems from general network access. Regular security updates and proper input validation procedures should be established as part of the overall security posture to prevent similar vulnerabilities from emerging in the future.