CVE-2018-3609 in Interscan Messaging Security Virtual Appliance
Summary
by MITRE
A vulnerability in the Trend Micro InterScan Messaging Security Virtual Appliance 9.0 and 9.1 management portal could allow an unauthenticated user to access sensitive information in a particular log file that could be used to bypass authentication on vulnerable installations.
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Analysis
by VulDB Data Team • 01/06/2020
The vulnerability identified as CVE-2018-3609 affects the Trend Micro InterScan Messaging Security Virtual Appliance version 9.0 and 9.1 management portal, representing a critical information disclosure flaw that undermines the security posture of email security infrastructure. This vulnerability stems from inadequate access controls within the management interface, specifically targeting a particular log file that contains sensitive authentication-related information. The flaw allows unauthenticated attackers to directly access restricted system data through a predictable path within the web application's file structure, bypassing the normal authentication mechanisms that should protect administrative functions.
The technical implementation of this vulnerability involves a path traversal or directory traversal flaw that enables an attacker to access log files containing session identifiers, authentication tokens, or other credential-related data without proper authorization. This type of vulnerability falls under CWE-22 Path Traversal and CWE-200 Information Exposure, where the application fails to properly validate user input or enforce access controls on file system requests. The attack vector leverages the web application's handling of file paths in the management portal, where insufficient input sanitization allows malicious users to construct URLs that access restricted files. According to the ATT&CK framework, this vulnerability maps to T1078 Valid Accounts and T1566 Phishing, as it enables attackers to obtain valid authentication credentials that can then be used for further compromise of the system.
The operational impact of CVE-2018-3609 extends beyond simple information disclosure, as the leaked authentication data could enable full administrative access to the messaging security appliance. This creates a significant risk for organizations relying on the appliance for email filtering and security, as attackers could potentially modify security policies, view encrypted email content, or even redirect email traffic through malicious configuration changes. The vulnerability affects the management portal's authentication layer, which is critical for maintaining the integrity of the entire security infrastructure, potentially allowing attackers to establish persistent access to the email environment. Organizations utilizing this appliance may experience unauthorized access to sensitive email communications, including business-critical correspondence and personally identifiable information.
Mitigation strategies for CVE-2018-3609 should focus on immediate patching of the affected Trend Micro appliances to version 9.2 or later, which includes the necessary security fixes for the authentication bypass vulnerability. Network segmentation should be implemented to restrict access to the management portal to authorized administrative networks only, while implementing strong access controls and monitoring for unusual file access patterns. Additionally, organizations should conduct thorough security assessments of their email infrastructure to identify other potential vulnerabilities in similar security appliances, as this type of flaw often indicates broader architectural weaknesses in web application security. The vulnerability highlights the importance of proper input validation and access control enforcement in web applications, particularly those handling sensitive security functions, and serves as a reminder of the critical need for regular security updates and vulnerability management processes.