FreeBSD up to 11.1 Network 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 categorized as problematic has been discovered in FreeBSD up to 11.1. This issue affects some unknown processing of the component Network Subsystem. Such manipulation leads to information disclosure (Kernel Memory). This vulnerability is referenced as CVE-2018-6921. The attack can only be performed from a local environment. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in FreeBSD up to 11.1 (Operating System). It has been rated as problematic. Affected by this issue is an unknown functionality of the component Network Subsystem. The manipulation with an unknown input leads to a information disclosure vulnerability (Kernel Memory). Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

In FreeBSD before 11.1-STABLE(r332066) and 11.1-RELEASE-p10, due to insufficient initialization of memory copied to userland in the network subsystem, 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 published 05/08/2018 (Website). The advisory is shared for download at security.FreeBSD.org. This vulnerability is handled as CVE-2018-6921 since 02/12/2018. The attack needs to be approached locally. The successful exploitation needs a simple authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

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(r332066) or 11.1-RELEASE-p10 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 104118†). Similar entry is available at VDB-117439. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

Website

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

AVACAuCIA
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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(r332066)/11.1-RELEASE-p10

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-2018-6921 (🔍)
GCVE (CVE): GCVE-0-2018-6921
GCVE (VulDB): GCVE-100-117440
SecurityFocus: 104118 - FreeBSD CVE-2018-6921 Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 05/09/2018 08:59
Updated: 02/03/2020 08:42
Changes: 05/09/2018 08:59 (65), 02/03/2020 08:42 (9)
Complete: 🔍
Cache ID: 216:694:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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