CVE-2020-25068 in Conacwin
Summary
by MITRE
Setelsa Conacwin v3.7.1.2 is vulnerable to a local file inclusion vulnerability. This vulnerability allows a remote unauthenticated attacker to read internal files on the server via an http:IP:PORT/../../path/file_to_disclose Directory Traversal URI.
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Analysis
by VulDB Data Team • 09/04/2020
The vulnerability identified as CVE-2020-25068 affects Setelsa Conacwin version 3.7.1.2 and represents a critical local file inclusion flaw that enables remote attackers to access sensitive internal server files. This vulnerability stems from inadequate input validation within the web application's URI processing mechanism, specifically when handling directory traversal sequences. The flaw allows attackers to manipulate URI parameters by appending sequences such as ../../ to navigate beyond the intended directory structure and access files that should remain restricted. This issue falls under the Common Weakness Enumeration category CWE-22, which defines improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability exists in the application's handling of user-supplied input in the HTTP request URI, where the system fails to properly sanitize or validate the paths specified by remote users. The impact of this vulnerability extends beyond simple information disclosure as it provides attackers with access to internal system files, configuration data, and potentially sensitive business logic that could be leveraged for further exploitation. The attack vector requires no authentication, making it particularly dangerous as any remote user can exploit this weakness without prior access credentials. This vulnerability aligns with ATT&CK technique T1083 which describes discovering file and directory permissions on compromised systems, and T1566 which covers the initial access phase through the exploitation of vulnerable applications.
The operational impact of this vulnerability is severe and multifaceted, as it allows attackers to extract critical system information that could aid in subsequent attack phases. Remote unauthenticated access to internal files means that attackers can potentially obtain database connection strings, application configuration files, source code, and other sensitive data that could compromise the entire system. The directory traversal mechanism enables access to files outside of the web root directory, potentially allowing attackers to read system files such as /etc/passwd or application logs that contain valuable information about the system's configuration and user accounts. This vulnerability also creates opportunities for attackers to escalate privileges or gain deeper system access by discovering sensitive files that may contain credentials or other exploitable information. The lack of authentication requirements means that this vulnerability can be exploited at scale without any prior system access, making it particularly attractive to automated attack tools and malicious actors seeking to compromise multiple systems. The vulnerability affects not just individual file access but the overall security posture of the system, as it demonstrates poor input validation practices that could lead to additional exploitation vectors.
Mitigation strategies for CVE-2020-25068 should focus on implementing robust input validation and sanitization mechanisms within the application. The most effective immediate fix involves implementing proper path validation that prevents directory traversal sequences from being processed by the application. This can be achieved through the use of allowlists that only permit specific, safe file paths or by implementing strict input filtering that removes or encodes dangerous characters such as .. and /. The application should also implement proper access controls and authentication mechanisms to prevent unauthorized access to sensitive resources. Organizations should consider implementing web application firewalls that can detect and block malicious URI patterns associated with directory traversal attacks. Additionally, regular security audits and code reviews should be conducted to identify and remediate similar input validation issues throughout the application codebase. The system should be updated to the latest version of Setelsa Conacwin that contains the patched implementation of the vulnerable functionality. Security monitoring should be enhanced to detect unusual file access patterns or attempts to access system directories that could indicate exploitation of this vulnerability. System administrators should also implement least privilege access controls and ensure that sensitive files are properly protected with appropriate permissions to limit the potential impact of any successful exploitation attempts.