CVE-2016-10031 in WampServer
Summary
by MITRE
** DISPUTED ** WampServer 3.0.6 installs two services called 'wampapache' and 'wampmysqld' with weak file permissions, running with SYSTEM privileges. This could potentially allow an authorized but non-privileged local user to execute arbitrary code with elevated privileges on the system. To properly exploit this vulnerability, the local attacker must insert an executable file called mysqld.exe or httpd.exe and replace the original files. The next time the service starts, the malicious file will get executed as SYSTEM. NOTE: the vendor disputes the relevance of this report, taking the position that a configuration in which "'someone' (an attacker) is able to replace files on a PC" is not "the fault of WampServer."
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Analysis
by VulDB Data Team • 08/06/2024
The vulnerability identified as CVE-2016-10031 resides within WampServer version 3.0.6, a widely used local web development environment that combines Apache httpd, MySQL, and PHP into a single package. This security flaw represents a classic privilege escalation vulnerability that exploits weak file permissions in the service installation process. The affected services 'wampapache' and 'wampmysqld' are configured to run with SYSTEM privileges, which constitutes the highest level of access within the Windows operating system. When services operate with such elevated privileges and are configured with inadequate file permissions, they create a significant attack surface that can be exploited by malicious actors.
The technical implementation of this vulnerability stems from the installation process where WampServer creates system services without proper access controls on the executable files. The services are designed to execute specific binaries - mysqld.exe for the MySQL service and httpd.exe for the Apache service - but these files are installed with permissions that allow modification by local users. This misconfiguration creates a path for privilege escalation where an attacker with local access can substitute the legitimate executables with malicious counterparts. The vulnerability operates under the principle of service binary replacement, where the attacker places their malicious executable in the service directory and waits for the service to restart, at which point the malicious code executes with SYSTEM privileges.
The operational impact of this vulnerability extends beyond simple local privilege escalation to represent a critical security weakness in the software installation and configuration process. The attack requires a local user to have the ability to modify files in the WampServer installation directory, which represents a scenario where the attacker has already established some level of presence on the system. However, the severity lies in the fact that the exploitation process is relatively straightforward and does not require sophisticated techniques or additional attack vectors. Once successful, the attacker gains complete control over the system, including the ability to install additional malware, modify system configurations, access sensitive data, and potentially escalate further within a network environment. This vulnerability directly aligns with CWE-276, which describes improper permissions for a resource, and represents a classic example of how weak file permissions can lead to privilege escalation.
The mitigation strategies for this vulnerability should focus on both immediate remediation and long-term configuration improvements. System administrators should ensure that WampServer installations are configured with proper file permissions that prevent local users from modifying service executables. This includes implementing restrictive access control lists on the service directories and ensuring that only authorized administrators have write permissions to these critical files. Additionally, regular security audits should verify that service binaries have not been modified and that proper file integrity checking mechanisms are in place. The vendor's position that this scenario represents an inherent system configuration issue rather than a software vulnerability is debatable, as proper software installation should account for the security implications of service execution contexts. This vulnerability demonstrates the importance of following the principle of least privilege and implementing proper file system security measures, particularly for services that operate with elevated privileges. Organizations should also consider implementing monitoring solutions that can detect unauthorized modifications to service binaries and establish proper security baselines for development environments to prevent such scenarios from occurring in production systems.