CVE-2018-6219 in Email Encryption Gateway
Summary
by MITRE
An Insecure Update via HTTP vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow an attacker to eavesdrop and tamper with with certain types of update data.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/24/2024
The vulnerability identified as CVE-2018-6219 represents a critical security flaw in Trend Micro Email Encryption Gateway version 5.5 that exposes the system to man-in-the-middle attacks during software update processes. This issue stems from the gateway's reliance on unencrypted HTTP connections for downloading update packages, creating an exploitable pathway for attackers to intercept and modify critical system components. The vulnerability specifically affects the update mechanism that handles email encryption gateway software updates, potentially allowing adversaries to inject malicious code or manipulate legitimate update files during transmission. The insecure update process creates a significant attack surface where network traffic can be monitored and altered without proper authentication or integrity verification mechanisms.
The technical implementation of this vulnerability resides in the gateway's update client software which defaults to using HTTP protocol for downloading patches and security updates. This design choice violates fundamental security principles by transmitting sensitive update data in plaintext over unsecured network connections. Attackers positioned within the network or capable of performing network interception attacks can leverage this weakness to perform credential theft, execute arbitrary code, or compromise the entire email encryption infrastructure. The vulnerability is categorized under CWE-319 - Cleartext Transmission of Sensitive Information, which specifically addresses the exposure of sensitive data through unencrypted communication channels. This weakness directly enables adversaries to perform protocol-level attacks such as HTTP hijacking, DNS spoofing, or network packet interception that can lead to complete system compromise.
The operational impact of CVE-2018-6219 extends beyond simple data interception, as it can result in complete system compromise and unauthorized access to encrypted email communications. When attackers successfully exploit this vulnerability, they can modify update packages to include backdoors, rootkits, or other malicious payloads that persistently compromise the email encryption gateway. The attack surface is particularly concerning because email encryption gateways are critical infrastructure components that handle sensitive corporate and personal communications, making them attractive targets for advanced persistent threats. Network administrators may be unaware of the compromise since the malicious updates appear legitimate, leading to prolonged exposure and potential data breaches. This vulnerability aligns with ATT&CK technique T1071.004 - Application Layer Protocol: DNS, where attackers can manipulate update processes through network-based attacks, and T1021.002 - Remote Services: Telnet, as the compromised system may later be used for lateral movement.
Organizations should implement immediate mitigations including disabling HTTP-based updates and enforcing HTTPS connections for all update mechanisms. The recommended approach involves configuring the email encryption gateway to only accept updates from verified secure sources and implementing network segmentation to limit access to update servers. Security controls should include mandatory certificate validation, digital signature verification, and network monitoring for suspicious update traffic patterns. System administrators must also establish secure update policies that require manual verification of update integrity before deployment. Additional protective measures include implementing network intrusion detection systems to monitor for anomalous update behavior and establishing secure update distribution channels through trusted third-party vendors. The vulnerability highlights the importance of following security frameworks such as NIST SP 800-53 and ISO 27001 controls that mandate secure communication protocols and update management practices for critical infrastructure components.