CVE-2018-18255 in Access Manager
Summary
by MITRE
An issue was discovered in CapMon Access Manager 5.4.1.1005. The client applications of AccessManagerCoreService.exe communicate with this server through named pipes. A user can initiate communication with the server by creating a named pipe and sending commands to achieve elevated privileges.
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Analysis
by VulDB Data Team • 08/01/2023
The vulnerability identified as CVE-2018-18255 resides within CapMon Access Manager version 5.4.1.1005, specifically affecting the AccessManagerCoreService.exe component that manages client-server communications through named pipes. This represents a critical privilege escalation flaw that directly exploits the service's communication architecture to allow unauthorized users to execute commands with elevated privileges. The vulnerability stems from insufficient access controls and authentication mechanisms within the named pipe communication channel, creating an attack surface where malicious actors can establish connections and send arbitrary commands to the privileged service.
The technical implementation of this vulnerability leverages the Windows named pipe functionality as a communication mechanism between client applications and the AccessManagerCoreService.exe server process. When a user creates a named pipe connection to the service, they can transmit commands that are subsequently executed with the privileges of the running service account. This design flaw violates fundamental security principles by not implementing proper authentication or authorization checks before processing incoming commands, allowing any local user to potentially escalate their privileges to system level access. The vulnerability is classified as a privilege escalation issue that aligns with CWE-269: "Improper Privilege Management" and represents a classic example of insecure inter-process communication.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the security model of the CapMon Access Manager system. An attacker with local access can leverage this vulnerability to execute arbitrary code with elevated privileges, potentially leading to complete system compromise. The attack vector is particularly concerning because it requires minimal privileges to exploit, making it accessible to users who may not have administrative rights initially. This vulnerability directly maps to ATT&CK technique T1068: "Exploitation for Privilege Escalation" and can be used as a stepping stone for further lateral movement within a network. The service's reliance on named pipes without proper access control creates a persistent threat vector that could be exploited by both malicious insiders and external attackers who gain local access to the system.
Mitigation strategies for CVE-2018-18255 should focus on implementing proper access controls and authentication mechanisms for the named pipe communication channel. Organizations should ensure that only authorized users and processes can establish connections to the privileged service through the named pipe interface. The recommended approach includes implementing proper access control lists on named pipes, enforcing authentication before command execution, and limiting the privileges of the AccessManagerCoreService.exe process to the minimum required for operation. Additionally, security patches should be applied immediately to upgrade to versions that address this vulnerability, as the flaw represents a fundamental architectural weakness in the service's communication model. Network segmentation and monitoring of named pipe activity can also help detect potential exploitation attempts, while regular security assessments should verify that no other services within the system exhibit similar privilege escalation vulnerabilities.