CVE-2021-44021 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 44020.
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Analysis
by VulDB Data Team • 12/09/2021
The vulnerability identified as CVE-2021-44021 represents a critical privilege escalation flaw within Trend Micro Worry-Free Business Security version 10.0 SP1, specifically targeting local attackers who have already gained low-privileged access to the system. This issue falls under the category of unnecessary privilege vulnerabilities as defined by CWE-272, where the software grants more privileges than strictly necessary for its operation, creating an exploitable condition that can be leveraged by malicious actors. The vulnerability exists in the privilege management mechanisms of the security software, allowing an attacker who has already compromised the system to elevate their privileges from a low-privileged user account to a higher-privilege level, potentially gaining administrative or system-level access.
The technical nature of this flaw stems from improper privilege handling within the Trend Micro security client components, where the software fails to properly validate or restrict the execution of privileged operations. This weakness creates a pathway for local attackers to exploit the existing privilege structure and escalate their access rights. The vulnerability operates on the principle that the security software should not grant unnecessary privileges to processes or users, yet in this case, it appears to provide elevated access rights that should be restricted to legitimate administrative functions. The similarity to CVE-2021-44019 and CVE-2021-44020 suggests a broader pattern of privilege management issues within the same product line, potentially indicating systemic problems in how the software handles user permissions and access control.
From an operational impact perspective, this vulnerability poses significant risks to enterprise environments that rely on Trend Micro Worry-Free Business Security for endpoint protection. The requirement for an attacker to first gain low-privileged code execution before exploiting this vulnerability does not diminish its severity, as the attack surface is still considerable given that many organizations have users with standard accounts or limited access rights that could be compromised through various attack vectors. Once an attacker successfully escalates privileges, they could potentially access sensitive system files, modify security configurations, or establish persistent access to the compromised system, making this vulnerability particularly dangerous in enterprise settings where the software is deployed across multiple endpoints. The attack pattern aligns with techniques described in the ATT&CK framework under privilege escalation tactics, specifically targeting the use of software exploitation to gain elevated system privileges.
The mitigation strategies for this vulnerability should focus on immediate patching of the Trend Micro Worry-Free Business Security software to the latest available version that addresses this privilege escalation flaw. Organizations should also implement comprehensive monitoring for unauthorized privilege changes and ensure that standard user accounts are properly isolated from systems running security software with elevated privileges. Additional defensive measures include regular privilege audits, implementation of least privilege principles for all system components, and ensuring that security software is properly configured to minimize unnecessary access rights. Network segmentation and access control measures should be strengthened to limit the potential impact of privilege escalation attacks, while security teams should monitor for indicators of compromise that may suggest exploitation attempts. The vulnerability underscores the importance of maintaining up-to-date security software and implementing robust access control policies to prevent attackers from leveraging privilege escalation flaws in enterprise security solutions.