Buffer overflow in Sophos Safeguard Easy Device Encryption Client
CVE-2018-6852
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 0x80202298. By crafting an input buffer we can control the execution path to the point where the nt!memset function is called to zero out contents of 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.
Vulnerability class: Buffer Overflow
EPSS: 0.006 (45.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Sophos Safeguard_easy_device_encryption_client — versions 6.00, 6.10, 7.00
- Sophos Safeguard_enterprise_client — versions 5.60.3, 6.00, 6.00.1
- Sophos Safeguard_lan_crypt_client — versions 3.90.1, 3.90.2, 3.95.1
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (x_refsource_CONFIRM, Patch, Vendor Advisory)
- cve@mitre.org (mailing-list, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
- cve@mitre.org (Technical Description, Exploit, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2018-6852?
- CVE-2018-6852 is a high-severity vulnerability in Sophos Safeguard Easy Device Encryption Client, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2018-07-09.
- How severe is CVE-2018-6852?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2018-6852 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.