CVE-2015-4716 in ownCloud Server
Summary
by MITRE
Directory traversal vulnerability in the routing component in ownCloud Server before 7.0.6 and 8.0.x before 8.0.4, when running on Windows, allows remote attackers to reinstall the application or execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 04/01/2025
The CVE-2015-4716 vulnerability represents a critical directory traversal flaw within the routing component of ownCloud Server versions prior to 7.0.6 and 8.0.x prior to 8.0.4 when operating on Windows platforms. This vulnerability stems from improper input validation and path handling mechanisms that fail to adequately sanitize user-supplied data before processing file system operations. The flaw specifically affects the application's ability to correctly resolve and validate file paths, creating opportunities for malicious actors to manipulate the application's behavior through crafted requests that traverse directory structures beyond intended boundaries.
The technical implementation of this vulnerability exploits the difference in path handling between Windows and Unix-like systems, where Windows file paths use backslashes and have specific directory traversal semantics that can be manipulated through carefully crafted input. Attackers can leverage this weakness to perform unauthorized operations including but not limited to application reinstallation, arbitrary code execution, and potential privilege escalation. The vulnerability operates by exploiting the routing component's failure to properly validate or canonicalize file paths, allowing malicious input to bypass security checks and access restricted system resources. This type of flaw falls under CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which is a well-documented category of path traversal vulnerabilities that affect numerous web applications and operating systems.
The operational impact of CVE-2015-4716 is severe and multifaceted, particularly for organizations relying on ownCloud for file synchronization and sharing services. Remote attackers can exploit this vulnerability to gain unauthorized access to the application's installation directory, potentially leading to complete system compromise. The ability to reinstall the application opens doors for attackers to modify core application components, inject malicious code, or establish persistent backdoors. Additionally, the arbitrary code execution capability allows threat actors to run malicious payloads with the privileges of the application service account, which could result in data exfiltration, system enumeration, or further lateral movement within the network. The vulnerability is particularly dangerous in enterprise environments where ownCloud serves as a central file sharing platform and where attackers could leverage this weakness to gain access to sensitive organizational data.
Organizations should prioritize immediate remediation by upgrading to ownCloud Server versions 7.0.6 or 8.0.4 and later, which contain patches addressing this directory traversal vulnerability. System administrators should also implement network segmentation and access controls to limit exposure of the ownCloud service to untrusted networks. Additional mitigations include implementing web application firewalls that can detect and block suspicious path traversal patterns, conducting regular security audits of the application's file permissions, and establishing monitoring procedures to detect unauthorized file system modifications. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059 - Command and Scripting Interpreter and T1068 - Exploitation for Privilege Escalation, highlighting the need for comprehensive defensive measures including endpoint detection and response capabilities. The vulnerability also underscores the importance of input validation and secure coding practices, particularly when developing applications that must operate across multiple operating system platforms with different path handling semantics. Organizations should also consider implementing principle of least privilege access controls and regular security assessments to identify and remediate similar vulnerabilities in their software infrastructure.