CVE-2016-10072 in WampServer
Summary
by MITRE
** DISPUTED ** WampServer 3.0.6 has two files called 'wampmanager.exe' and 'unins000.exe' with a weak ACL for Modify. 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 wampmanager.exe or unins000.exe and replace the original files. The next time one of these programs is launched by a more privileged user, malicious code chosen by the local attacker will run. 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 • 07/03/2024
The vulnerability identified as CVE-2016-10072 affects WampServer version 3.0.6 and stems from improper access control mechanisms within the software installation process. This issue manifests through two critical executable files named 'wampmanager.exe' and 'unins000.exe' which possess weak access control lists that grant modification privileges to unauthorized local users. The vulnerability represents a classic privilege escalation vector where a low-privileged attacker can manipulate system files to gain elevated execution rights. According to industry standards, this type of weakness maps to CWE-276, which specifically addresses incorrect access control, and falls under the broader category of privilege escalation vulnerabilities that attackers frequently target in local system compromise operations.
The technical flaw in this vulnerability lies in the inadequate permission settings applied to critical system executables during the WampServer installation process. When these files are installed with overly permissive ACLs, any local user with basic system access can modify their contents. This creates a dangerous scenario where an attacker can simply replace the legitimate executable files with malicious versions containing arbitrary code. The vulnerability requires the attacker to have local access to the system and the ability to write to the installation directory, but once achieved, it provides a persistent backdoor mechanism. The exploitation process is straightforward: the attacker places a malicious executable with the same name as the legitimate file, and when the system launches either wampmanager.exe or unins000.exe with elevated privileges, the malicious code executes with those elevated permissions rather than the original legitimate functionality.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within the compromised system. Since these are core system management executables, their compromise can lead to complete system takeover, data exfiltration, or establishment of additional attack vectors. The vulnerability is particularly concerning in enterprise environments where local user access might be more prevalent than expected, and where WampServer is commonly installed on development machines or servers. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1068, which covers 'Local Privilege Escalation' and demonstrates how attackers can leverage weak file permissions to achieve elevation of privileges without requiring sophisticated exploitation techniques or external network access.
While the vendor has disputed the validity of this vulnerability report by arguing that the scenario constitutes a configuration issue rather than a software flaw, security professionals recognize that proper access control mechanisms should be implemented within software installations regardless of system configuration. The fundamental principle of least privilege should apply to all system components, and software vendors must ensure their products do not create inherently insecure configurations. Organizations should implement comprehensive file integrity monitoring solutions to detect unauthorized modifications to critical system executables and maintain strict access controls on installation directories. The vulnerability highlights the importance of secure coding practices and proper privilege management within software installation processes, emphasizing that even seemingly benign applications can create significant security risks when not properly secured against local file manipulation attacks. This case study demonstrates how seemingly minor access control oversights can lead to substantial privilege escalation capabilities, reinforcing the need for comprehensive security reviews of all software installation processes and file permission settings.