CVE-2023-4172 in Flash Flood Disaster Monitoring and Warning System
Summary
by MITRE • 08/06/2023
A vulnerability, which was classified as problematic, has been found in Chengdu Flash Flood Disaster Monitoring and Warning System 2.0. This issue affects some unknown processing of the file \Service\FileHandler.ashx. The manipulation of the argument FileDirectory leads to absolute path traversal. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-236207.
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Analysis
by VulDB Data Team • 08/30/2023
The vulnerability identified as CVE-2023-4172 represents a critical security flaw within the Chengdu Flash Flood Disaster Monitoring and Warning System 2.0, a critical infrastructure application designed for environmental monitoring and emergency response. This system plays a vital role in flood prediction and warning mechanisms, making its security paramount for public safety and disaster management operations. The vulnerability resides in the file processing component located at \Service\FileHandler.ashx, which handles file operations for the system's monitoring capabilities. The flaw manifests through improper input validation and path handling when processing the FileDirectory argument, creating a condition that allows attackers to manipulate file system access through absolute path traversal techniques.
The technical implementation of this vulnerability stems from insufficient sanitization of user-supplied input parameters within the FileHandler.ashx component, which directly processes the FileDirectory argument without adequate validation or normalization of path components. When an attacker supplies a malicious FileDirectory parameter containing absolute path traversal sequences such as ../../ or ..\.., the system fails to properly validate these inputs against a whitelist of acceptable paths or sanitize the input to prevent directory traversal attacks. This weakness enables attackers to navigate outside the intended file system boundaries and access arbitrary files on the server, potentially leading to unauthorized data access, system compromise, or information disclosure. The vulnerability's classification as remotely exploitable indicates that attackers can leverage this flaw through network-based attacks without requiring physical access to the system, making it particularly dangerous for operational environments.
The operational impact of this vulnerability extends beyond simple data exposure, as it could compromise the integrity and availability of the flood monitoring system's critical functions. An attacker exploiting this vulnerability could potentially access sensitive environmental data, system configuration files, or even manipulate the monitoring system's operational parameters, which could lead to false alarms or critical system failures during actual flood events. The disclosure of this exploit to the public community significantly increases the risk profile, as malicious actors can now readily implement attacks against vulnerable installations. The vulnerability's potential for causing disruption to emergency response systems could have severe consequences for public safety, particularly during critical weather events when accurate and timely flood warnings are essential for evacuation and response planning.
Organizations operating the Chengdu Flash Flood Disaster Monitoring and Warning System 2.0 should immediately implement comprehensive mitigation strategies to address this vulnerability. The primary remediation approach involves implementing strict input validation and sanitization for all file path parameters, particularly the FileDirectory argument, using positive validation techniques that only accept known good paths or properly normalized input. Implementing proper access controls and privilege separation within the system can limit the damage potential even if path traversal occurs. Additionally, organizations should consider implementing web application firewalls and intrusion detection systems to monitor for suspicious file access patterns. The vulnerability aligns with CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and represents a clear violation of the principle of least privilege in system design. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1074.001 (Data Staged) and T1566.001 (Phishing: Spearphishing Attachment), as attackers could potentially use this vulnerability to stage malicious payloads or access sensitive operational data. Regular security assessments and input validation testing should be conducted to prevent similar vulnerabilities from emerging in other system components, particularly in file handling and user input processing functions.