VDB-120956 · CVE-2018-6855 · Qualys 371335

Sophos SafeGuard Enterprise access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as critical has been found in Sophos SafeGuard Enterprise, SafeGuard Easy and SafeGuard LAN Crypt. Affected by this vulnerability is an unknown functionality. Such manipulation leads to access control. This vulnerability is documented as CVE-2018-6855. The attack needs to be performed locally. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Sophos SafeGuard Enterprise, SafeGuard Easy and SafeGuard LAN Crypt (the affected version unknown) and classified as critical. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 06/25/2018. The weakness was released 07/09/2018 as confirmed mailinglist post (Full-Disclosure). The advisory is shared for download at seclists.org. This vulnerability is handled as CVE-2018-6855 since 02/08/2018. The attack needs to be approached locally. A simple authentication is necessary for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 14 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371335 (Sophos SafeGuard Enterprise Client for Windows Multiple Vulnerabilities).

Upgrading eliminates this vulnerability.

Entries connected to this vulnerability are available at VDB-120952, VDB-120953, VDB-120954 and VDB-120955. Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Sophos

Name

License

commercial

Website

Vendor: https://www.sophos.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/08/2018 🔍
06/25/2018 +137 days 🔍
07/09/2018 +13 days 🔍
07/09/2018 +0 days 🔍
07/10/2018 +1 days 🔍
03/03/2020 +602 days 🔍

Sourcesinfo

Vendor: sophos.com

Advisory: seclists.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-6855 (🔍)
GCVE (CVE): GCVE-0-2018-6855
GCVE (VulDB): GCVE-100-120956
See also: 🔍

Entryinfo

Created: 07/10/2018 10:05
Updated: 03/03/2020 15:39
Changes: 07/10/2018 10:05 (63), 03/03/2020 15:39 (1)
Complete: 🔍
Cache ID: 216::103