CVE-2017-11382 in Deep Discovery Email Inspector
Summary
by MITRE
Denial of Service vulnerability in Trend Micro Deep Discovery Email Inspector 2.5.1 allows remote attackers to delete arbitrary files on vulnerable installations, thus disabling the service. Formerly ZDI-CAN-4350.
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Analysis
by VulDB Data Team • 01/07/2021
The CVE-2017-11382 vulnerability represents a critical denial of service flaw in Trend Micro Deep Discovery Email Inspector version 2.5.1 that enables remote attackers to execute arbitrary file deletion operations on affected systems. This vulnerability stems from insufficient input validation and improper access controls within the email inspection appliance's file handling mechanisms. The flaw allows attackers to manipulate the system's file operations through specially crafted requests that bypass normal authentication and authorization checks, ultimately leading to complete service disruption.
The technical implementation of this vulnerability involves a path traversal or file manipulation flaw that permits remote exploitation without requiring authentication credentials. Attackers can construct malicious payloads that target specific file paths within the system's file structure, enabling them to delete critical system files or configuration data necessary for the appliance's operation. This type of vulnerability typically falls under CWE-22 Path Traversal and CWE-73 Path Traversal, where improper validation of file paths allows attackers to access and manipulate files outside the intended directory structure. The vulnerability's impact is exacerbated by the fact that it operates at the system level rather than just application level, giving attackers the ability to compromise core system functionality.
From an operational perspective, the implications of CVE-2017-11382 are severe as it can completely disable email inspection services that organizations rely upon for threat detection and security monitoring. The vulnerability's remote exploitability means that attackers can compromise systems from anywhere on the network without physical access or valid credentials, making it particularly dangerous in enterprise environments where email security appliances serve as critical infrastructure components. Organizations using this appliance may experience complete loss of email security monitoring capabilities, potentially exposing their networks to undetected threats and malicious email traffic. The attack vector typically involves sending specially crafted HTTP requests or API calls that trigger the vulnerable file deletion functionality, resulting in service unavailability.
The mitigation strategies for this vulnerability should include immediate patch deployment from Trend Micro to address the underlying file handling implementation flaws and access control weaknesses. Organizations should also implement network segmentation to limit access to the email inspection appliance, deploy intrusion detection systems to monitor for suspicious file manipulation patterns, and establish regular backup procedures to ensure rapid recovery from potential compromise. Additionally, implementing web application firewalls and restricting external access to administrative interfaces can help reduce the attack surface. This vulnerability aligns with several ATT&CK techniques including T1105 Remote File Copy and T1499 Endpoint Termination, where adversaries seek to disable system services and compromise endpoint integrity. The remediation process should also include comprehensive security assessments to identify similar vulnerabilities in other network security appliances and ensure proper input validation across all system components.