CVE-2024-1531 in RTU500
Summary
by MITRE • 03/27/2024
A vulnerability exists in the stb-language file handling that affects the RTU500 series product versions listed below. A malicious actor could print random memory content in the RTU500 system log, if an authorized user uploads a specially crafted stb-language file.
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Analysis
by VulDB Data Team • 03/27/2024
The vulnerability identified as CVE-2024-1531 represents a critical information disclosure flaw within the RTU500 series industrial control systems, specifically targeting the stb-language file processing functionality. This vulnerability stems from inadequate input validation and memory management practices during the handling of language configuration files, which are essential components for system localization and user interface rendering. The affected RTU500 series products operate in environments where security and reliability are paramount, making such vulnerabilities particularly concerning for industrial control systems. The flaw manifests when the system processes specially crafted stb-language files, which are typically used to configure language settings for user interfaces and system logging mechanisms.
The technical implementation of this vulnerability involves improper memory handling during the parsing and processing of stb-language files, creating a condition where random memory contents can be inadvertently printed to system logs. This occurs due to insufficient bounds checking and memory allocation validation within the language file parser, allowing attackers to craft malicious files that exploit buffer overflow or uninitialized memory access patterns. The vulnerability is classified under CWE-125 as "Out-of-bounds Read" and potentially CWE-200 as "Information Exposure," demonstrating how improper input handling can lead to unintended information disclosure. When an authorized user uploads the malicious file, the system's language processing module fails to properly validate the file structure, causing it to read and output memory segments that contain sensitive data, system configurations, or potentially even cryptographic keys or credentials stored in adjacent memory locations.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can provide attackers with valuable insights into the system's internal state and memory layout, facilitating more sophisticated attacks. System logs containing random memory content may reveal sensitive information such as system configuration parameters, user credentials, network addresses, or even portions of source code, depending on what data happens to be stored in the affected memory regions. This vulnerability is particularly dangerous in industrial environments where RTU500 series devices control critical infrastructure, as the leaked information could be leveraged to plan targeted attacks against the broader network or to exploit other system components. The attack vector requires an authorized user to upload a malicious file, which aligns with ATT&CK technique T1078.004 for Valid Accounts and T1566.001 for Phishing, suggesting potential social engineering or insider threat scenarios. The vulnerability could enable adversaries to conduct reconnaissance and information gathering activities that would otherwise be difficult to achieve through standard attack methods.
Mitigation strategies for CVE-2024-1531 should focus on implementing robust input validation and memory management controls within the stb-language file processing module. Organizations should immediately apply vendor-provided patches or firmware updates that address the memory handling flaws in the language file parser. System administrators should implement strict file validation procedures, including checksum verification and format validation, before allowing any stb-language files to be processed by the RTU500 systems. Network segmentation and access controls should be strengthened to limit the number of authorized users who can upload configuration files to these critical systems. Additionally, monitoring and logging of file upload activities should be enhanced to detect any suspicious file uploads that may indicate attempted exploitation of this vulnerability. Regular security assessments and penetration testing should be conducted to identify similar memory handling issues in other system components, as this vulnerability represents a broader class of flaws that could exist in other file processing modules. The remediation process should also include comprehensive system hardening measures that align with industrial control system security frameworks such as NIST SP 800-82 and IEC 62443 standards to ensure long-term protection against similar vulnerabilities.