CVE-2018-6854 : Exploit Details and Defense Strategies

Sophos SafeGuard Enterprise, SafeGuard Easy, and SafeGuard LAN Crypt versions before specified releases are susceptible to Local Privilege Escalation through various IOCTLs.

Understanding CVE-2018-6854

This CVE involves vulnerabilities in Sophos SafeGuard products that can lead to Local Privilege Escalation.

What is CVE-2018-6854?

Vulnerabilities in Sophos SafeGuard Enterprise, SafeGuard Easy, and SafeGuard LAN Crypt versions before specific releases
Exploitable through IOCTLs, allowing Local Privilege Escalation

The Impact of CVE-2018-6854

Enables modification of Token object, granting SE_DEBUG_NAME privilege
Allows interaction with higher privileged processes as SYSTEM

Technical Details of CVE-2018-6854

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Vulnerabilities in Sophos SafeGuard products before certain versions
Exploitable through IOCTLs, leading to Local Privilege Escalation

Affected Systems and Versions

Sophos SafeGuard Enterprise versions before 8.00.5
SafeGuard Easy versions before 7.00.3
SafeGuard LAN Crypt versions before 3.95.2

Exploitation Mechanism

Conditions in user-controlled input buffer trigger writing of error code to specified address
IOCTLs use transfer type METHOD_NEITHER, bypassing I/O manager validation
Ability to modify Token object structure and grant SE_DEBUG_NAME privilege

Mitigation and Prevention

Protect systems from CVE-2018-6854 with the following steps:

Immediate Steps to Take

Update Sophos SafeGuard products to versions 8.00.5, 7.00.3, and 3.95.2 or later
Monitor and restrict user-controlled input to prevent buffer overflow

Long-Term Security Practices

Regularly update and patch Sophos SafeGuard products
Implement least privilege access controls to limit potential damage

Patching and Updates

Apply security patches provided by Sophos to address CVE-2018-6854