FreeBSD up to 10.4/11.1 Linux Subsystem Kernel Memory information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability was found in FreeBSD up to 10.4/11.1. It has been rated as problematic. This vulnerability affects unknown code of the component Linux Subsystem. This manipulation causes information disclosure (Kernel Memory). The identification of this vulnerability is CVE-2018-6920. The attack can only be executed locally. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in FreeBSD up to 10.4/11.1 (Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown function of the component Linux Subsystem. The manipulation with an unknown input leads to a information disclosure vulnerability (Kernel Memory). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

In FreeBSD before 11.1-STABLE(r332303), 11.1-RELEASE-p10, 10.4-STABLE(r332321), and 10.4-RELEASE-p9, due to insufficient initialization of memory copied to userland in the Linux subsystem and Atheros wireless driver, small amounts of kernel memory may be disclosed to userland processes. Unprivileged authenticated local users may be able to access small amounts of privileged kernel data.

The bug was discovered 05/08/2018. The weakness was shared 05/08/2018 (Website). It is possible to read the advisory at security.FreeBSD.org. This vulnerability is known as CVE-2018-6920 since 02/12/2018. Attacking locally is a requirement. The successful exploitation requires a single authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 119886 (pfSense 2.3.x < 2.3.5-p2 / 2.4.x < 2.4.3-p1 Multiple Vulnerabilities (SA-18_04 / SA-18_05)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Firewalls and running in the context r.

Upgrading to version 11.1-STABLE(r332303) eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119886) and SecurityFocus (BID 104114†). The entry VDB-117440 is related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: Kernel Memory
Class: Information disclosure / Kernel Memory
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119886
Nessus Name: pfSense 2.3.x < 2.3.5-p2 / 2.4.x < 2.4.3-p1 Multiple Vulnerabilities (SA-18_04 / SA-18_05)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: FreeBSD 11.1-STABLE(r332303)

Timelineinfo

02/12/2018 🔍
05/01/2018 +78 days 🔍
05/08/2018 +6 days 🔍
05/08/2018 +0 days 🔍
05/08/2018 +0 days 🔍
05/08/2018 +0 days 🔍
05/09/2018 +1 days 🔍
12/27/2018 +232 days 🔍
02/03/2020 +403 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: security.FreeBSD.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-6920 (🔍)
GCVE (CVE): GCVE-0-2018-6920
GCVE (VulDB): GCVE-100-117439
SecurityFocus: 104114 - FreeBSD CVE-2018-6920 Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 05/09/2018 08:59
Updated: 02/03/2020 08:41
Changes: 05/09/2018 08:59 (64), 02/03/2020 08:41 (9)
Complete: 🔍
Cache ID: 216:EBE:103

Be aware that VulDB is the high quality source for vulnerability data.

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