CVE-2017-9034 in ServerProtect for Linux
Summary
by MITRE
Trend Micro ServerProtect for Linux 3.0 before CP 1531 allows attackers to write to arbitrary files and consequently execute arbitrary code with root privileges by leveraging failure to validate software updates.
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Analysis
by VulDB Data Team • 10/02/2020
The vulnerability identified as CVE-2017-9034 affects Trend Micro ServerProtect for Linux version 3.0 prior to CP 1531, representing a critical security flaw that enables remote code execution with elevated privileges. This vulnerability stems from insufficient validation mechanisms within the software update process, creating a pathway for malicious actors to manipulate the system's file structure and gain root-level access. The flaw specifically resides in how the application handles software updates, where it fails to properly validate the integrity and authenticity of update packages before applying them to the system.
The technical implementation of this vulnerability involves a classic file write operation that lacks proper input sanitization and access control validation. When the ServerProtect application processes update files, it does not adequately verify the source or content of these packages, allowing attackers to craft malicious update files that will be executed with root privileges during the update process. This represents a privilege escalation vulnerability classified under CWE-22, which deals with improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. The vulnerability demonstrates characteristics of CWE-74, representing a weakness in which a program uses external input to construct a pathname that should be restricted, but fails to validate or sanitize the input properly.
From an operational perspective, this vulnerability presents a severe risk to organizations relying on Trend Micro ServerProtect for Linux, as successful exploitation can result in complete system compromise. Attackers can leverage this flaw to install backdoors, modify system files, or establish persistent access to compromised systems without requiring prior authentication. The impact extends beyond individual system compromise to potentially affect entire network infrastructures, especially in environments where multiple servers utilize the same vulnerable version of the software. The vulnerability affects systems running Linux operating systems and can be exploited remotely, making it particularly dangerous in cloud and distributed environments where network exposure is high.
The attack vector for CVE-2017-9034 typically involves an attacker uploading or delivering a malicious update package to the target system through various means, including compromised web servers, malicious software distribution channels, or direct network access. Once the malicious update is processed by the vulnerable ServerProtect application, the attacker gains root privileges and can execute arbitrary code on the system. This vulnerability aligns with ATT&CK technique T1059, which covers execution through command and scripting interpreters, as the attacker can leverage the elevated privileges to execute malicious commands and scripts directly on the compromised system. The vulnerability also maps to ATT&CK technique T1068, which addresses local privilege escalation, demonstrating how attackers can leverage software flaws to gain system-level access.
Mitigation strategies for CVE-2017-9034 primarily focus on immediate patching and system hardening measures. Organizations should immediately update to Trend Micro ServerProtect version 3.0 CP 1531 or later, which includes proper validation mechanisms for software updates. System administrators should also implement network segmentation and access controls to limit exposure of vulnerable systems, particularly those running the affected software. Additional protective measures include monitoring update processes for suspicious activity, implementing file integrity monitoring solutions, and conducting regular vulnerability assessments to identify other potentially vulnerable systems. The vulnerability serves as a reminder of the importance of secure update mechanisms and proper input validation in security software, as these components are critical for maintaining system integrity and preventing privilege escalation attacks. Organizations should also consider implementing application whitelisting policies and restricting write permissions to critical system directories to limit the impact of similar vulnerabilities in the future.