CVE-2018-4863 in Endpoint Protection
Summary
by MITRE
Sophos Endpoint Protection 10.7 allows local users to bypass an intended tamper protection mechanism by deleting the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Sophos Endpoint Defense\ registry key.
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Analysis
by VulDB Data Team • 10/18/2025
The vulnerability identified as CVE-2018-4863 affects Sophos Endpoint Protection version 10.7, specifically targeting the software's tamper protection mechanisms designed to safeguard critical system components from unauthorized modifications. This weakness represents a significant security flaw that undermines the integrity of the endpoint protection framework by allowing unauthorized local access to critical registry entries. The vulnerability resides within the Windows registry structure where Sophos stores its protection configuration, creating an exploitable path for malicious actors who seek to disable or circumvent security controls.
The technical flaw manifests through a direct registry manipulation opportunity that enables local users to remove a specific registry key path located at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Sophos Endpoint Defense. This registry key serves as a critical component in maintaining the tamper protection functionality, and its deletion effectively neutralizes the intended security controls. The vulnerability demonstrates poor access control implementation where local users possess sufficient privileges to manipulate system-critical registry entries that govern protection mechanisms. This represents a direct violation of the principle of least privilege and highlights inadequate privilege separation within the Sophos Endpoint Protection architecture.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows attackers to completely bypass the tamper protection that should prevent unauthorized modifications to the security software itself. Once the registry key is deleted, the endpoint protection system loses its ability to enforce protection mechanisms, potentially allowing malware or other malicious software to modify or disable the security solution without detection. This creates a persistent security risk where the very protection mechanisms designed to defend against attacks become compromised, enabling attackers to maintain persistence and evade detection. The vulnerability particularly impacts enterprise environments where endpoint protection is critical for maintaining security postures and preventing lateral movement within networks.
From a cybersecurity perspective, this vulnerability aligns with CWE-276, which addresses improper privileges and access control issues, and demonstrates characteristics consistent with ATT&CK technique T1562.001, which covers "Disable or Modify Tools" by targeting endpoint protection software. The vulnerability represents a critical weakness in the software's defense-in-depth strategy, as it allows local users to directly manipulate the system's security controls rather than requiring more complex exploitation techniques. Organizations should consider implementing additional monitoring for registry modifications targeting the Sophos service paths and establish baseline configurations to detect unauthorized changes that could indicate exploitation attempts.
Mitigation strategies should include immediate patching of Sophos Endpoint Protection to version 10.7.1 or later, which addresses this specific registry manipulation vulnerability. System administrators should implement registry monitoring solutions that alert on modifications to the targeted registry key path, particularly in high-value environments where endpoint protection integrity is paramount. Additional protective measures include implementing strict access controls and privilege management policies that limit local user access to system-critical registry entries, along with regular security audits to verify the integrity of protection mechanisms. Network segmentation and application whitelisting policies can provide additional layers of defense against exploitation attempts, while endpoint detection and response solutions should be configured to monitor for suspicious registry modifications that could indicate attempts to disable security controls.