CVE-2026-57471 in RevPiPyLoad
Summary
by MITRE • 08/14/2026
Nozomi Networks Labs identified a CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the file management functionality of the XML-RPC management interface of KUNBUS RevPiPyLoad in version 0.11.0 that allows a local unauthenticated attacker to read arbitrary files with the privileges of the RevPiPyLoad daemon, including sensitive configuration and credential material, by sending crafted requests to the local management service.
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Analysis
by VulDB Data Team • 08/14/2026
The vulnerability under analysis represents a critical path traversal flaw that exists within the XML-RPC management interface of KUNBUS RevPiPyLoad version 0.11.0. This issue manifests as CWE-22, which specifically addresses improper limitation of pathname to restricted directories, creating a fundamental security weakness in the system's file access controls. The vulnerability is particularly concerning because it affects a local management service that operates without authentication requirements, providing an attack surface that can be exploited by any local user or process with access to the system.
The technical implementation of this flaw occurs within the file management functionality of the XML-RPC interface where input validation fails to properly sanitize user-supplied pathname data. When crafted requests are sent to the local management service, the system processes these inputs without adequate restrictions on directory traversal sequences such as ../ or ..\ that would normally be blocked by proper path validation mechanisms. This allows attackers to manipulate file access operations and navigate beyond intended directories to access restricted files on the filesystem.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it provides attackers with the ability to read arbitrary files with the privileges of the RevPiPyLoad daemon itself. This means that sensitive configuration files containing system settings, credential material, and potentially authentication tokens could be accessed by unauthorized local users. The implications are particularly severe in industrial control environments where RevPiPyLoad systems may contain proprietary process data, security credentials, or operational parameters that could be exploited for further compromise of the industrial network.
Security professionals should note that this vulnerability aligns with ATT&CK technique T1059.007 for XML-RPC and web services, as it exploits a remote management interface to execute unauthorized file operations. The lack of authentication requirements for the local service makes this particularly dangerous in environments where physical access is possible or where privilege escalation attacks could occur. Organizations should consider implementing proper input validation and path sanitization measures that align with industry best practices for preventing path traversal attacks.
Mitigation strategies should include immediate patching to versions that address the path traversal vulnerability, implementation of proper input validation on all XML-RPC endpoints, and consideration of access controls that limit local service exposure. The recommended approach involves enforcing strict directory restrictions within the file management functions and implementing comprehensive logging of file access operations to detect potential exploitation attempts. Additionally, organizations should conduct thorough security assessments of all management interfaces to identify similar path traversal vulnerabilities in other industrial control systems and ensure proper network segmentation to limit lateral movement capabilities.
Industry standards such as NIST SP 800-53 and ISO/IEC 27001 emphasize the importance of input validation and access control mechanisms that directly address this type of vulnerability. The CWE classification specifically recommends implementing path normalization, canonicalization, and strict validation of all file paths to prevent unauthorized access to restricted directories. Organizations should also consider implementing principle of least privilege models where management services operate with minimal necessary permissions and employ defense-in-depth strategies that include network monitoring and intrusion detection systems to identify potential exploitation attempts.
The presence of this vulnerability in industrial control environments like those utilizing RevPiPyLoad highlights the critical need for comprehensive security hardening measures in operational technology systems. Given the potential for significant operational disruption and security compromise, organizations should prioritize immediate remediation efforts while also implementing long-term security improvements that address similar vulnerabilities across their industrial control infrastructure.