CVE-2018-6855

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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 0x80202014. By crafting an input buffer we can control the execution path to the point where the constant 0xFFFFFFF will be written to a user-controlled address. We can take advantage of this condition to modify the SEP_TOKEN_PRIVILEGES structure of the Token object belonging to the exploit process and grant SE_DEBUG_NAME privilege. This allows the exploit process to interact with higher privileged processes running as SYSTEM and execute code in their security context.

Sophos SafeGuard Enterprise en versiones anteriores a la 8.00.5, SafeGuard Easy en versiones anteriores a la 7.00.3, y SafeGuard LAN Crypt en versiones anteriores a la 3.95.2 son vulnerables a una escalada de privilegios local mediante IOCTL 0x80202014. Manipulando un búfer de entrada, es posible controlar la ruta de ejecución al punto en el que la constante 0xFFFFFFF se escribirá en una dirección controlada por el usuario. Se puede aprovechar esta situación para modificar la estructura SEP_TOKEN_PRIVILEGES del objeto Token que pertenece al proceso del exploit y otorgar privilegios SE_DEBUG_NAME. Esto permite que el proceso del exploit interactúe con procesos con privilegios más elevados que se ejecutan como SYSTEM, ejecutando código en su contexto de seguridad.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-02-08 CVE Reserved
2018-07-04 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

CAPEC

References (3)

URL	Tag	Source
http://seclists.org/fulldisclosure/2018/Jul/20	Issue Tracking

URL	Date	SRC
https://labs.nettitude.com/blog/cve-2018-6851-to-cve-2018-6857-sophos-privilege-escalation-vulnerabilities	2024-08-05

URL	Date	SRC
https://community.sophos.com/kb/en-us/131934	2019-10-03

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Sophos Search vendor "Sophos"		Safeguard Easy Device Encryption Client Search vendor "Sophos" for product "Safeguard Easy Device Encryption Client"				6.00 Search vendor "Sophos" for product "Safeguard Easy Device Encryption Client" and version "6.00"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Easy Device Encryption Client Search vendor "Sophos" for product "Safeguard Easy Device Encryption Client"				6.10 Search vendor "Sophos" for product "Safeguard Easy Device Encryption Client" and version "6.10"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Easy Device Encryption Client Search vendor "Sophos" for product "Safeguard Easy Device Encryption Client"				7.00 Search vendor "Sophos" for product "Safeguard Easy Device Encryption Client" and version "7.00"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Enterprise Client Search vendor "Sophos" for product "Safeguard Enterprise Client"				5.60.3 Search vendor "Sophos" for product "Safeguard Enterprise Client" and version "5.60.3"		vs-nfd		Affected
Sophos Search vendor "Sophos"		Safeguard Enterprise Client Search vendor "Sophos" for product "Safeguard Enterprise Client"				6.00 Search vendor "Sophos" for product "Safeguard Enterprise Client" and version "6.00"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Enterprise Client Search vendor "Sophos" for product "Safeguard Enterprise Client"				6.00.1 Search vendor "Sophos" for product "Safeguard Enterprise Client" and version "6.00.1"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Enterprise Client Search vendor "Sophos" for product "Safeguard Enterprise Client"				6.10 Search vendor "Sophos" for product "Safeguard Enterprise Client" and version "6.10"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Enterprise Client Search vendor "Sophos" for product "Safeguard Enterprise Client"				7.00 Search vendor "Sophos" for product "Safeguard Enterprise Client" and version "7.00"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Enterprise Client Search vendor "Sophos" for product "Safeguard Enterprise Client"				8.00 Search vendor "Sophos" for product "Safeguard Enterprise Client" and version "8.00"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Lan Crypt Client Search vendor "Sophos" for product "Safeguard Lan Crypt Client"				3.90.1 Search vendor "Sophos" for product "Safeguard Lan Crypt Client" and version "3.90.1"		ts		Affected
Sophos Search vendor "Sophos"		Safeguard Lan Crypt Client Search vendor "Sophos" for product "Safeguard Lan Crypt Client"				3.90.2 Search vendor "Sophos" for product "Safeguard Lan Crypt Client" and version "3.90.2"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Lan Crypt Client Search vendor "Sophos" for product "Safeguard Lan Crypt Client"				3.95.1 Search vendor "Sophos" for product "Safeguard Lan Crypt Client" and version "3.95.1"		-		Affected
Sophos Search vendor "Sophos"		Safeguard Lan Crypt Client Search vendor "Sophos" for product "Safeguard Lan Crypt Client"				3.95.1 Search vendor "Sophos" for product "Safeguard Lan Crypt Client" and version "3.95.1"		ts		Affected