CVE-2015-7815 in Piwik
Summary
by MITRE
Directory traversal vulnerability in core/ViewDataTable/Factory.php in Piwik before 2.15.0 allows remote attackers to include and execute arbitrary local files via the viewDataTable parameter.
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Analysis
by VulDB Data Team • 06/27/2022
The vulnerability identified as CVE-2015-7815 represents a critical directory traversal flaw within the Piwik analytics platform, specifically located in the core/ViewDataTable/Factory.php file. This issue affects versions prior to 2.15.0 and enables remote attackers to exploit the system by manipulating the viewDataTable parameter, ultimately allowing for arbitrary local file inclusion and execution. The flaw stems from inadequate input validation and sanitization mechanisms within the file processing logic, creating a pathway for malicious actors to access sensitive system resources. This vulnerability is particularly dangerous as it can be exploited without authentication, making it accessible to any remote user with network access to the affected system.
The technical implementation of this directory traversal vulnerability occurs through the improper handling of user-supplied input in the viewDataTable parameter. When Piwik processes this parameter, it fails to adequately sanitize or validate the input before using it in file inclusion operations. Attackers can manipulate this parameter to traverse the file system hierarchy and include arbitrary local files, potentially leading to code execution on the target server. The vulnerability aligns with CWE-22, which specifically addresses directory traversal or path traversal attacks, where attackers can manipulate file paths to access unauthorized files. This weakness allows adversaries to bypass normal access controls and potentially gain access to sensitive configuration files, database credentials, or other system resources that should remain protected.
The operational impact of CVE-2015-7815 extends beyond simple unauthorized file access, as it can lead to complete system compromise and data exfiltration. Remote attackers can leverage this vulnerability to execute arbitrary code on the server, potentially escalating privileges and establishing persistent access to the affected system. The attack vector is particularly concerning because it requires no authentication, making it a prime target for automated exploitation campaigns. Organizations running vulnerable versions of Piwik face significant risk of data breaches, system compromise, and potential regulatory violations, especially in environments where the analytics platform processes sensitive user data. This vulnerability can also serve as a stepping stone for further attacks within a network, as compromised systems often provide access to internal resources that would otherwise be protected.
Mitigation strategies for CVE-2015-7815 primarily focus on immediate remediation through software updates to Piwik version 2.15.0 or later, which includes proper input validation and sanitization mechanisms. Organizations should implement network-level protections such as web application firewalls to monitor and block suspicious parameter values, particularly those containing directory traversal sequences like ../ or ..\.. The implementation of strict input validation and sanitization practices, including the use of allowlists for valid viewDataTable parameters, can significantly reduce the attack surface. Additionally, system administrators should conduct regular security assessments and implement proper access controls to limit the potential impact of any successful exploitation attempts. This vulnerability demonstrates the importance of following security best practices such as the principle of least privilege and regular security patching, which are fundamental concepts in both NIST cybersecurity frameworks and MITRE ATT&CK matrix categorization for privilege escalation techniques.