CVE-2021-4481 in Protector Software
Summary
by MITRE • 06/03/2026
Dräger Protector Software prior to version 6.4.2 contains a local privilege escalation vulnerability due to insecure file system permissions that allows local attackers to execute arbitrary code with elevated privileges. Attackers can replace binaries or loaded modules on the host system to execute code with NT SYSTEM privileges.
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Analysis
by VulDB Data Team • 06/04/2026
The Dräger Protector Software vulnerability represents a critical local privilege escalation flaw that has significant implications for system security and operational integrity. This vulnerability affects versions prior to 6.4.2 and stems from inadequate file system permission controls within the software installation and runtime environment. The flaw allows attackers with local system access to escalate their privileges to the highest level available on the Windows operating system, effectively granting them complete control over the affected system. The vulnerability is particularly concerning because it operates at the file system level, where attackers can manipulate core system components without requiring network access or complex exploitation techniques. The insecure permissions create a pathway for malicious actors to replace legitimate binaries or dynamically loaded modules with malicious equivalents, enabling arbitrary code execution with the privileges of the NT SYSTEM account. This type of vulnerability directly violates fundamental security principles of least privilege and proper access control enforcement, creating a persistent backdoor for attackers who have already gained initial access to the system. The impact extends beyond simple privilege escalation as it allows attackers to modify system configurations, install additional malware, or establish persistent access mechanisms that can survive system reboots.
The technical implementation of this vulnerability aligns with common patterns found in software privilege escalation flaws, particularly those related to insecure file permissions and weak access controls. Attackers can exploit this weakness by identifying writable directories within the software installation path where they can place malicious binaries or DLL files. Once these components are loaded by the software process, they execute with elevated privileges, effectively bypassing normal user access controls. The vulnerability demonstrates poor security hygiene in the software's file system permission model, where critical system components are not properly protected against modification by unauthorized users. This flaw operates under the broader category of privilege escalation vulnerabilities that are classified under CWE-264, which specifically addresses permissions, privileges, and access controls. The attack vector is particularly dangerous because it requires minimal skill level to exploit, making it attractive to both novice and experienced attackers. The vulnerability can be leveraged in conjunction with other attack techniques within the MITRE ATT&CK framework, particularly in the privilege escalation and persistence phases, where attackers seek to maintain long-term access to compromised systems.
The operational impact of this vulnerability extends far beyond immediate privilege escalation, creating cascading security risks for organizations that deploy Dräger Protector Software. Once attackers achieve SYSTEM-level privileges, they can manipulate system logs to cover their tracks, modify security policies, and access sensitive data that was previously protected by normal access controls. The vulnerability also affects the integrity of the software itself, as attackers can replace legitimate software components with malicious versions that continue to function normally while providing backdoor access. Organizations may experience unauthorized data access, system compromise, and potential regulatory compliance violations depending on the nature of the data processed by the affected software. The vulnerability's persistence mechanism is particularly concerning as it can survive system reboots and continues to provide attackers with elevated privileges until the software is properly updated. This creates a window of opportunity for attackers to conduct extended reconnaissance, data exfiltration, or lateral movement within network environments where the vulnerable software is deployed. The exploitation of this vulnerability can also result in the complete compromise of enterprise systems, especially in environments where the software is used to monitor or control critical infrastructure components.
Mitigation strategies for this vulnerability should focus on immediate remediation through software updates to version 6.4.2 or later, which addresses the insecure file system permissions that enable the privilege escalation. Organizations should also implement comprehensive permission auditing to identify and correct similar vulnerabilities in other software installations and system components. The principle of least privilege should be enforced by ensuring that software installations have the minimum required file system permissions necessary for their operation. Regular security assessments of installed software should include verification of file system permissions and access control configurations to prevent similar vulnerabilities from being introduced. Network segmentation and access controls should be implemented to limit the potential impact of local privilege escalation attacks, ensuring that even if one system is compromised, attackers cannot easily move laterally to other parts of the network. System monitoring should be enhanced to detect unauthorized modifications to critical system files and binaries, particularly those associated with privileged software components. Security awareness training for system administrators should emphasize the importance of proper permission management and the risks associated with insecure file system configurations. Additionally, organizations should consider implementing application whitelisting policies that restrict which binaries can execute with elevated privileges, thereby reducing the effectiveness of attacks that rely on replacing legitimate components with malicious equivalents.