CVE-2021-44020 in Worry-Free Business Security
Summary
by MITRE • 12/03/2021
An unnecessary privilege vulnerability in Trend Micro Worry-Free Business Security 10.0 SP1 could allow a local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. This vulnerability is similar to but not identical to CVE-2021-44019 and 44021.
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Analysis
by VulDB Data Team • 12/09/2021
The vulnerability identified as CVE-2021-44020 represents a critical privilege escalation flaw within Trend Micro Worry-Free Business Security version 10.0 SP1, specifically targeting the local attacker threat model. This security weakness stems from improper privilege management within the software's architecture, creating an avenue for malicious actors who have already gained low-privileged access to elevate their system privileges. The vulnerability's classification aligns with CWE-276, which addresses improper privilege management, and falls under the ATT&CK technique T1068 for local privilege escalation. The affected Trend Micro product operates with a complex multi-layered architecture that includes various system components requiring different privilege levels for proper operation.
The technical implementation of this vulnerability lies in the insufficient validation of privilege levels during specific system operations within the Trend Micro security suite. When legitimate system processes attempt to perform administrative functions, the software fails to properly verify that the requesting entity possesses the necessary elevated privileges. This design flaw allows an attacker who has already executed code with standard user privileges to manipulate the software's internal processes and gain unauthorized administrative access. The vulnerability's similarity to CVE-2021-44019 and CVE-2021-44021 indicates a systemic weakness in the software's privilege handling mechanisms, suggesting that these related vulnerabilities share common architectural flaws in their privilege validation logic.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the security model of the affected system. Once successfully exploited, the attacker gains complete administrative control over the target system, enabling them to modify critical system files, install malicious software, disable security features, and access sensitive data. The attack vector requires initial access through other means, making this vulnerability particularly dangerous as a secondary exploitation target. This weakness can be leveraged in combination with other vulnerabilities to create a complete compromise scenario, where an attacker first gains initial access through a different vulnerability and then uses CVE-2021-44020 to achieve full system control. The vulnerability affects enterprise environments where Trend Micro Worry-Free Business Security is deployed, potentially exposing multiple systems to complete compromise.
Organizations should implement immediate mitigations including applying the latest security patches from Trend Micro, which address the privilege validation flaws in the software's architecture. Network segmentation and privilege separation measures can help limit the potential impact if exploitation occurs, while monitoring for suspicious process execution patterns can aid in early detection of exploitation attempts. System administrators should review and enforce least privilege principles for all system components, ensuring that only necessary processes have elevated privileges. The vulnerability's classification under CWE-276 and its relationship to other similar vulnerabilities in the same product line emphasize the need for comprehensive security reviews of the entire Trend Micro Worry-Free Business Security suite. Regular security assessments should focus on privilege management controls and ensure that all system components properly validate privilege levels before executing sensitive operations. Additionally, implementing behavioral monitoring solutions can help detect anomalous privilege escalation activities that may indicate exploitation attempts against this vulnerability.