CVE-2012-3356 in ViewVC
Summary
by MITRE
The remote SVN views functionality (lib/vclib/svn/svn_ra.py) in ViewVC before 1.1.15 does not properly perform authorization, which allows remote attackers to bypass intended access restrictions via unspecified vectors.
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Analysis
by VulDB Data Team • 12/06/2021
The vulnerability identified as CVE-2012-3356 resides within the ViewVC software ecosystem, specifically affecting versions prior to 1.1.15. This issue manifests in the remote SVN views functionality located in the lib/vclib/svn/svn_ra.py file, where inadequate authorization controls are implemented. ViewVC serves as a web-based interface for browsing version control repositories, particularly SVN systems, making it a critical component in software development environments where access control and repository visibility must be strictly enforced. The flaw represents a significant security weakness that undermines the fundamental access control mechanisms designed to protect sensitive source code repositories from unauthorized access.
The technical nature of this vulnerability stems from improper authorization implementation within the SVN views functionality, allowing remote attackers to bypass intended access restrictions through unspecified vectors. This authorization bypass occurs at the application layer where the system fails to properly validate user permissions before granting access to repository contents. The vulnerability operates by exploiting gaps in the access control validation process, potentially enabling attackers to view restricted repository paths, files, or revision histories that should only be accessible to authorized users. This flaw aligns with CWE-285, which addresses improper authorization issues in software systems, and represents a classic example of insufficient access control validation that can lead to information disclosure and privilege escalation scenarios.
The operational impact of CVE-2012-3356 extends beyond simple unauthorized access to potentially compromise entire software development environments. Attackers exploiting this vulnerability could gain visibility into sensitive code repositories, including proprietary source code, configuration files, and development artifacts that should remain confidential. This exposure poses significant risks to organizations relying on ViewVC for repository management, as it could lead to intellectual property theft, exposure of security vulnerabilities within source code, or facilitate further attacks on development infrastructure. The remote nature of the attack vector means that unauthorized access can occur from any location without requiring physical access to the system or prior authentication credentials, making the vulnerability particularly dangerous in publicly accessible environments.
Organizations affected by this vulnerability should prioritize immediate remediation through upgrading to ViewVC version 1.1.15 or later, which contains the necessary authorization fixes. The mitigation strategy should also include implementing network-level controls such as firewall rules to restrict access to ViewVC interfaces, particularly in environments where the software is exposed to untrusted networks. Additionally, administrators should conduct comprehensive access control reviews to ensure that existing user permissions are properly configured and that no unauthorized accounts exist within the system. This vulnerability demonstrates the critical importance of maintaining up-to-date software versions and implementing robust access control mechanisms, aligning with ATT&CK technique T1078 for valid accounts and T1566 for credential access through unauthorized access to systems. Security teams should also consider implementing monitoring solutions to detect anomalous access patterns that might indicate exploitation attempts against this or similar authorization bypass vulnerabilities.