CVE-2019-9552 in Eloan
Summary
by MITRE
Eloan V3.0 through 2018-09-20 allows remote attackers to list files via a direct request to the p2p/api/ or p2p/lib/ or p2p/images/ URI.
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Analysis
by VulDB Data Team • 07/26/2023
The vulnerability identified as CVE-2019-9552 affects the Eloan platform version 3.0 and earlier releases up to September 20, 2018, presenting a critical directory traversal issue that enables remote attackers to enumerate files within the system's file structure. This weakness stems from insufficient access controls and inadequate input validation within the p2p/api/, p2p/lib/, and p2p/images/ URI endpoints, which allows unauthorized users to directly request and list directory contents without proper authentication or authorization checks. The flaw represents a classic case of improper access control as classified under CWE-285, where the system fails to properly enforce access restrictions on sensitive resources. This vulnerability aligns with ATT&CK technique T1083 which describes discovering files and directories, providing attackers with valuable reconnaissance information about the target system's structure and potentially revealing sensitive files or system components.
The technical implementation of this vulnerability exploits the lack of proper input sanitization and access control mechanisms within the web application's routing logic. When attackers send direct HTTP requests to the specified URI paths, the application fails to validate whether the requesting user has appropriate permissions to access the requested directory structure. This allows for arbitrary directory listing operations that can reveal sensitive information about the application's file system layout, including potential paths to configuration files, source code, or other system components that could be exploited further. The vulnerability is particularly concerning because it provides attackers with a straightforward method to map the application's file structure without requiring any special privileges or credentials, making it easily exploitable in automated scanning operations.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with comprehensive knowledge of the system's internal file organization which can significantly aid in subsequent exploitation attempts. An attacker could use the directory listing information to identify sensitive files such as database configuration files, application source code, or backup files that might contain credentials or other exploitable information. This vulnerability essentially provides an attacker with a roadmap of the system's file structure, enabling more sophisticated attacks such as path traversal, local file inclusion, or remote code execution attempts that could compromise the entire system. The exposure of internal directory structures also violates fundamental security principles of least privilege and defense in depth, as sensitive system information is made accessible through publicly reachable endpoints.
Mitigation strategies for CVE-2019-9552 should focus on implementing robust access control mechanisms and input validation for all web application endpoints. Organizations should immediately restrict access to the vulnerable URI paths through proper authentication and authorization checks, ensuring that only authorized users can access the p2p/api/, p2p/lib/, and p2p/images/ directories. The application should implement proper input validation and sanitization to prevent directory traversal attacks, including the use of allowlists for valid directory paths and proper path resolution mechanisms that prevent access to parent directories. Additionally, the system should be configured to disable directory listing features and implement proper logging of access attempts to these endpoints. Security patches should be applied to update the Eloan platform to versions that address this vulnerability, and network segmentation should be implemented to limit access to these sensitive endpoints from untrusted networks. Regular security testing including penetration testing and vulnerability scanning should be conducted to identify and remediate similar access control weaknesses in the application's architecture.