What’s Vulnerable › Vulnerabilities

CVE-2018-6851

• Severity: high (CVSS 7.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-07-09 · updated 2026-06-17
• Weakness: CWE-119

Description

Sophos SafeGuard Enterprise before 8.00.5, SafeGuard Easy before 7.00.3, and SafeGuard LAN Crypt before 3.95.2 are vulnerable to Local Privilege Escalation via IOCTL 0x80206040. By crafting an input buffer we can control the execution path to the point where the constant DWORD 0 will be written to a user-controlled address. We can take advantage of this condition to zero-out the pointer to the security descriptor in the object header of a privileged process or modify the security descriptor itself and run code in the context of a process running as SYSTEM.

Affected products

• Sophos Safeguard Easy Device Encryption Client: 6.00, 6.10, 7.00
• Sophos Safeguard Enterprise Client: 5.60.3-vs-nfd, 6.00, 6.00.1, 6.10, 7.00, 8.00
• Sophos Safeguard Lan Crypt Client: 3.90.1-ts, 3.90.2, 3.95.1, 3.95.1-ts

References

• http://seclists.org/fulldisclosure/2018/Jul/20
• https://community.sophos.com/kb/en-us/131934
• https://labs.nettitude.com/blog/cve-2018-6851-to-cve-2018-6857-sophos-privilege-escalation-vulnerabilities/
• http://seclists.org/fulldisclosure/2018/Jul/20
• https://community.sophos.com/kb/en-us/131934
• https://labs.nettitude.com/blog/cve-2018-6851-to-cve-2018-6857-sophos-privilege-escalation-vulnerabilities/

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