CVE-2016-8590 in Threat Discovery Appliance
Summary
by MITRE
log_query_dlp.cgi in Trend Micro Threat Discovery Appliance 2.6.1062r1 and earlier allows remote authenticated users to execute arbitrary code as the root user via shell metacharacters in the cache_id parameter.
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Analysis
by VulDB Data Team • 12/02/2022
The vulnerability identified as CVE-2016-8590 affects the Trend Micro Threat Discovery Appliance version 2.6.1062r1 and earlier systems, representing a critical remote code execution flaw that can be exploited by authenticated attackers. This vulnerability specifically resides in the log_query_dlp.cgi component of the appliance, which processes user requests and handles various logging functions. The issue stems from improper input validation and sanitization within the cache_id parameter processing, creating a path for malicious input to be interpreted as shell commands rather than simple data parameters.
The technical flaw manifests through command injection vulnerabilities that fall under CWE-77 and CWE-94 categories, where user-supplied input is directly incorporated into shell execution contexts without proper sanitization or escaping mechanisms. When an authenticated user submits a malicious cache_id parameter containing shell metacharacters such as semicolons, ampersands, or backticks, the application fails to properly validate or escape these characters before using them in system calls. This allows attackers to inject arbitrary shell commands that execute with the privileges of the root user, effectively providing complete system compromise.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to gain full administrative control over the Threat Discovery Appliance. Once exploited, the attacker can modify system configurations, access sensitive data, install backdoors, or even use the compromised appliance as a pivot point to attack other systems within the network. The vulnerability affects the appliance's security monitoring capabilities, potentially allowing attackers to hide their activities or disable security features while maintaining persistent access. The remote nature of the exploit means that attackers do not require physical access to the device, and the authenticated requirement reduces the attack surface but does not eliminate the severity of the impact.
Security practitioners should implement immediate mitigations including applying the vendor-provided patches and updates that address the input validation issues in the log_query_dlp.cgi component. Network segmentation and access controls should be reinforced to limit the number of users with legitimate access to the appliance's administrative functions. Monitoring for suspicious parameter values in system logs and implementing web application firewalls can help detect and prevent exploitation attempts. Organizations should also conduct comprehensive security assessments of their Trend Micro appliances to identify potential other vulnerabilities that may exist within the same software ecosystem. The vulnerability demonstrates the importance of input validation in web applications and aligns with ATT&CK technique T1059 for command and scripting interpreter, specifically focusing on the execution of malicious commands through shell injection. This vulnerability type represents a classic example of how insufficient input sanitization can lead to complete system compromise, emphasizing the need for robust security practices throughout the software development lifecycle.