CVE-2018-16156 Explained : Impact and Mitigation

PaperStream IP (TWAIN) 1.42.0.5685 (Service Update 7) allows for local privilege escalation through a specific named pipe, potentially leading to SYSTEM level access.

Understanding CVE-2018-16156

This CVE describes a vulnerability in the FJTWSVIC service within PaperStream IP (TWAIN) 1.42.0.5685 that can be exploited for privilege escalation.

What is CVE-2018-16156?

The FJTWSVIC service in PaperStream IP (TWAIN) 1.42.0.5685 processes unauthenticated messages over a named pipe, allowing the loading of a specific DLL to elevate privileges to SYSTEM level.

The Impact of CVE-2018-16156

Exploitation of this vulnerability can result in an attacker gaining elevated privileges on the affected system, potentially leading to unauthorized access and control.

Technical Details of CVE-2018-16156

PaperStream IP (TWAIN) 1.42.0.5685 vulnerability specifics and affected systems.

Vulnerability Description

The FJTWSVIC service processes unauthenticated messages over a named pipe, attempting to load the UninOldIS.dll library to execute a function that can escalate privileges.

Affected Systems and Versions

PaperStream IP (TWAIN) 1.42.0.5685 (Service Update 7)

Exploitation Mechanism

The vulnerability allows an attacker to place a malicious DLL with the same name in a directory listed in the PATH variable to achieve SYSTEM level privilege.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2018-16156.

Immediate Steps to Take

Monitor for any unauthorized access or changes in system behavior.
Restrict access to the vulnerable service and associated named pipe.
Implement proper DLL loading controls and validation mechanisms.

Long-Term Security Practices

Regularly update and patch the affected software to the latest version.
Conduct security assessments and penetration testing to identify and address vulnerabilities.

Patching and Updates

Apply patches and security updates provided by the software vendor to address the vulnerability.