CVE-2011-4535 in TurboPower Abbrevia
Summary
by MITRE
Buffer overflow in TurboPower Abbrevia before 4.0, as used in ScadaTEC ScadaPhone 5.3.11.1230 and earlier, ScadaTEC ModbusTagServer 4.1.1.81 and earlier, and other products, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted ZIP file.
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Analysis
by VulDB Data Team • 05/04/2025
The vulnerability identified as CVE-2011-4535 represents a critical buffer overflow flaw within TurboPower Abbrevia library versions prior to 4.0, which has been exploited in several industrial automation and SCADA systems. This vulnerability affects ScadaTEC ScadaPhone 5.3.11.1230 and earlier versions, as well as ScadaTEC ModbusTagServer 4.1.1.81 and earlier versions, demonstrating the widespread impact of this flaw across industrial control systems. The buffer overflow occurs during the processing of ZIP file archives, making it particularly dangerous in environments where file handling is frequent and automated. The vulnerability stems from inadequate input validation and memory management within the library's decompression routines, creating a condition where maliciously crafted ZIP files can overwrite adjacent memory locations.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. Attackers can exploit this weakness by crafting a specially designed ZIP file that triggers the buffer overflow during extraction or decompression processes. The attack vector is remote, meaning that adversaries can deliver malicious ZIP files through network channels without requiring physical access to the target systems. This remote exploit capability significantly increases the attack surface and makes the vulnerability particularly dangerous in networked industrial environments where systems may be exposed to external threats. The flaw can result in application crashes that lead to denial of service conditions, or in more severe cases, allow for arbitrary code execution, potentially enabling full system compromise.
The operational impact of CVE-2011-4535 extends beyond simple service disruption, as it can compromise the integrity and availability of industrial control systems that rely on these components for their operations. In SCADA environments, where continuous operation is critical for process control and safety systems, a denial of service condition could lead to production halts, safety system failures, or data integrity issues. The potential for arbitrary code execution creates additional risks where attackers could gain persistent access to systems, modify control parameters, or redirect system operations. This vulnerability particularly affects the industrial automation sector, where systems often operate in closed networks but may still be exposed to threats through various attack vectors including email attachments, web downloads, or network file transfers. The affected products typically process various file formats for configuration, data exchange, or system updates, making them susceptible to exploitation through these legitimate file handling functions.
Mitigation strategies for this vulnerability should include immediate patching of affected systems with updated versions of TurboPower Abbrevia library, or replacement with alternative libraries that have been verified as free from similar buffer overflow conditions. Organizations should implement network segmentation and access controls to limit exposure of vulnerable systems to untrusted networks and users. Input validation controls should be strengthened at all levels where ZIP file processing occurs, including implementing strict file format checks and size limitations. Security monitoring should be enhanced to detect unusual file processing activities or system behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of keeping third-party libraries updated and following secure coding practices, particularly in industrial environments where the consequences of system compromise can be severe. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in other components of industrial control systems, as this vulnerability serves as a reminder of the risks associated with outdated software components in critical infrastructure environments.