CVE-2016-7802 in Garoon
Summary
by MITRE
Directory traversal vulnerability in Cybozu Garoon 3.0.0 to 4.2.2 allows remote authenticated attackers to read arbitrary files via unspecified vectors.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 12/26/2020
The vulnerability identified as CVE-2016-7802 represents a critical directory traversal flaw within Cybozu Garoon versions 3.0.0 through 4.2.2. This security weakness enables remote authenticated attackers to access arbitrary files on the affected system by exploiting unspecified vectors within the application's file handling mechanisms. The vulnerability stems from inadequate input validation and improper path resolution processes that fail to properly sanitize user-supplied data before processing file operations. Such flaws typically arise when applications directly incorporate user input into file system operations without sufficient sanitization or access control measures.
The technical implementation of this directory traversal vulnerability allows attackers who have already established authentication credentials to manipulate file access requests through crafted input sequences. These attacks commonly exploit the use of special characters like ".." or "\" to navigate outside the intended directory boundaries and access restricted files. The vulnerability's impact extends beyond simple information disclosure as it can potentially lead to complete system compromise when combined with other attack vectors. According to CWE classification, this vulnerability maps to CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The weakness creates a direct pathway for attackers to bypass normal access controls and retrieve sensitive data including configuration files, database credentials, application source code, and other confidential information stored on the server.
From an operational perspective, the implications of this vulnerability are severe as it requires only authenticated access to potentially compromise the entire system. The attack surface is particularly concerning because Cybozu Garoon is typically deployed in enterprise environments where it handles sensitive business data and user information. The vulnerability's remote nature means attackers can exploit it from outside the network perimeter, making it particularly dangerous for organizations with inadequate network segmentation. Attackers can leverage this weakness to extract valuable intelligence including user credentials, business documents, and system configuration details that could be used for further exploitation. The vulnerability also aligns with ATT&CK technique T1083, which covers discovery of file and directory permissions, as attackers can use directory traversal to enumerate system files and identify potential targets for additional attacks. Organizations using affected versions of Garoon face significant risk of data breaches, regulatory compliance violations, and potential financial losses due to unauthorized access to sensitive information.
Mitigation strategies for CVE-2016-7802 should include immediate patching of affected systems to the latest available versions that contain proper input validation and path sanitization measures. Organizations should implement comprehensive access control mechanisms that enforce least privilege principles and restrict file system access to authenticated users. Network segmentation and firewall rules should be configured to limit access to the Garoon application and its underlying file systems. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other applications. Additionally, implementing web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts. The vulnerability underscores the importance of maintaining up-to-date security patches and following secure coding practices that prevent directory traversal attacks through proper input validation, canonicalization of file paths, and implementation of robust access control measures. Organizations should also consider implementing automated monitoring solutions that can detect anomalous file access patterns indicative of directory traversal attempts.