CVE-2021-32022 in Protect
Summary
by MITRE • 11/10/2021
A low privileged delete vulnerability using CEF RPC server of BlackBerry Protect for Windows version(s) versions 1574 and earlier could allow an attacker to potentially execute code in the context of a BlackBerry Cylance service that has admin rights on the system and gaining the ability to delete data from the local system.
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Analysis
by VulDB Data Team • 11/12/2021
The vulnerability identified as CVE-2021-32022 represents a critical privilege escalation issue within the BlackBerry Protect for Windows security solution, specifically affecting versions 1574 and earlier. This flaw manifests through the CEF RPC server component, which serves as a communication interface for the BlackBerry Cylance service. The vulnerability allows a low privileged user to exploit a delete functionality that should normally be restricted, potentially enabling code execution within the context of the BlackBerry Cylance service account. This service account operates with administrative privileges on the target system, creating a significant security risk that could be leveraged by malicious actors to gain elevated access and execute arbitrary code.
The technical implementation of this vulnerability stems from improper access controls within the CEF RPC server's delete operation handling mechanism. When a local user attempts to perform a delete operation through this interface, the system fails to properly validate the privileges of the requesting user. This design flaw enables unauthorized deletion actions that should be restricted to administrative users only, effectively creating a backdoor that bypasses normal authentication and authorization protocols. The vulnerability operates at the application layer and can be exploited through local system interactions, making it particularly dangerous in environments where users may have limited access but still need to interact with the security solution.
The operational impact of CVE-2021-32022 extends beyond simple privilege escalation to encompass potential data destruction and system compromise. Attackers who successfully exploit this vulnerability can execute code with administrative privileges, effectively bypassing the security controls that the BlackBerry Protect solution is designed to enforce. This creates a scenario where an attacker can delete critical system files, modify security configurations, or establish persistence mechanisms within the target environment. The ability to delete data from the local system represents a significant threat vector, as it can lead to data loss, system instability, or complete system compromise depending on the scope of the deleted files and the system's configuration.
Organizations utilizing BlackBerry Protect for Windows versions 1574 and earlier should implement immediate mitigations to address this vulnerability. The primary recommendation involves applying the vendor-provided security patches and updates that address the access control flaws in the CEF RPC server component. System administrators should also consider implementing additional monitoring and logging around the BlackBerry Cylance service to detect unauthorized access attempts or unusual deletion activities. Network segmentation and least privilege principles should be enforced to limit the potential impact of exploitation, while regular security assessments should be conducted to identify similar vulnerabilities in other security solutions. This vulnerability aligns with CWE-284, which addresses improper access control, and represents a potential pathway for attackers to achieve persistence and escalate privileges within the ATT&CK framework through the privilege escalation and execution techniques.
The broader implications of this vulnerability highlight the importance of maintaining up-to-date security solutions and conducting regular vulnerability assessments. Organizations should establish robust patch management processes to ensure that security updates are deployed promptly across all systems, particularly those running security software that operates with elevated privileges. The vulnerability demonstrates how even security tools can contain flaws that create attack vectors, emphasizing the need for comprehensive security testing and validation of all security components. Regular security audits should include evaluation of privilege escalation paths and access control mechanisms within security applications to prevent similar vulnerabilities from being exploited in production environments.