VDB-127432 · CVE-2018-6439 · GCVE-0-2018-6439

Brocade Fabric OS up to 7.4.2c/8.0.2e/8.1.2e/8.2.0 Command Line Interface 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.
7.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Brocade Fabric OS up to 7.4.2c/8.0.2e/8.1.2e/8.2.0 and classified as critical. This affects an unknown function of the component Command Line Interface. Executing a manipulation can lead to access control. This vulnerability is tracked as CVE-2018-6439. The attack is restricted to local execution. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Brocade Fabric OS up to 7.4.2c/8.0.2e/8.1.2e/8.2.0. This vulnerability affects an unknown code of the component Command Line Interface. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A Vulnerability in the configdownload command of Brocade Fabric OS command line interface (CLI) versions before 8.2.1, 8.1.2f, 8.0.2f, 7.4.2d could allow a local attacker to escape the restricted shell and, gain root access.

The bug was discovered 10/29/2018. The weakness was disclosed 12/03/2018 (Website). The advisory is shared for download at broadcom.com. This vulnerability was named CVE-2018-6439 since 01/31/2018. The attack needs to be approached locally. A single authentication is needed 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 35 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 7.4.2d, 8.0.2f, 8.1.2f or 8.2.1 eliminates this vulnerability.

The entry VDB-126597 is pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Brocade

Name

Fabric OS

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.7

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

ADP CISA Base Score: 7.8
ADP CISA 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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Fabric OS 7.4.2d/8.0.2f/8.1.2f/8.2.1

Timelineinfo

01/31/2018 🔍
10/29/2018 +271 days 🔍
12/03/2018 +35 days 🔍
12/03/2018 +0 days 🔍
12/04/2018 +1 days 🔍
06/03/2026 +2738 days 🔍

Sourcesinfo

Advisory: broadcom.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-6439 (🔍)
GCVE (CVE): GCVE-0-2018-6439
GCVE (VulDB): GCVE-100-127432
See also: 🔍

Entryinfo

Created: 12/04/2018 07:40
Updated: 06/03/2026 19:36
Changes: 12/04/2018 07:40 (59), 04/17/2020 08:19 (2), 06/03/2026 19:36 (28)
Complete: 🔍
Cache ID: 216::103

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