CVE-2021-45441 in Apex One
Summary
by MITRE • 01/10/2022
A origin validation error vulnerability in Trend Micro Apex One (on-prem and SaaS) could allow a local attacker drop and manipulate a specially crafted file to issue commands over a certain pipe and elevate to a higher level of privileges. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
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Analysis
by VulDB Data Team • 01/13/2022
The vulnerability identified as CVE-2021-45441 represents a critical origin validation error within Trend Micro Apex One across both on-premises and Software-as-a-Service deployments. This flaw manifests as a privilege escalation vulnerability that enables local attackers to manipulate system processes through carefully crafted file manipulation. The vulnerability specifically targets the application's failure to properly validate the origin of files being processed, creating a pathway for malicious actors to execute arbitrary commands through a designated pipe mechanism. The attack vector requires initial compromise of a low-privileged account, making it a typical privilege escalation vulnerability that follows the common pattern of exploiting insufficient access controls and validation mechanisms.
The technical exploitation of this vulnerability involves the attacker first gaining execution privileges within the target system, typically through a separate initial compromise vector. Once established, the attacker can drop a specially crafted file that exploits the origin validation error within Trend Micro Apex One's processing pipeline. This manipulation allows the attacker to issue commands through a specific pipe interface, effectively bypassing normal security boundaries. The vulnerability's classification aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and CWE-78, which addresses OS command injection vulnerabilities. The underlying issue stems from inadequate input validation and insufficient origin verification mechanisms that should have prevented unauthorized command execution through the pipe interface.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with elevated system privileges that could enable further lateral movement and persistence within compromised networks. The vulnerability affects both on-premises and cloud-based deployments of Trend Micro Apex One, creating a widespread risk across different deployment models. Organizations utilizing Trend Micro's security solutions face significant risk from this vulnerability, as it allows attackers to bypass endpoint protection mechanisms that should have prevented such unauthorized command execution. The attack requires an initial foothold but provides a clear path to privilege escalation, making it particularly dangerous in environments where endpoint security is considered a primary defense mechanism.
Mitigation strategies for CVE-2021-45441 should focus on immediate patch application from Trend Micro, as well as implementing additional access controls and monitoring for suspicious file creation patterns. Organizations should deploy enhanced logging and monitoring around pipe usage and file manipulation activities, particularly in areas where Trend Micro Apex One processes files. The vulnerability's requirement for initial low-privileged code execution means that comprehensive endpoint detection and response measures should be implemented to prevent initial compromise. Network segmentation and principle of least privilege enforcement can help limit the potential impact of successful exploitation, while regular security assessments should verify that proper origin validation mechanisms are in place. Security teams should also consider implementing behavioral monitoring to detect anomalous command execution patterns that might indicate exploitation attempts. This vulnerability demonstrates the critical importance of proper input validation and origin verification in security applications, aligning with ATT&CK technique T1068 which covers local privilege escalation through system binary manipulation.