Quantum Secular Labs / Blog / Advisories

CVE-2016-9361: Administration passwords can be retried without authenticating.

CVE-2016-9361 is rated critical with a CVSS v3.0 base score of 9.8 and NVD lists 10 affected products, including Moxa Nport 5100 Series Firmware. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

An issue was discovered in Moxa NPort 5110 versions prior to 2.6, NPort 5130/5150 Series versions prior to 3.6, NPort 5200 Series versions prior to 2.8, NPort 5400 Series versions prior to 3.11, NPort 5600 Series versions prior to 3.7, NPort 5100A Series & NPort P5150A versions prior to 1.3, NPort 5200A Series versions prior to 1.3, NPort 5150AI-M12 Series versions prior to 1.2, NPort 5250AI-M12 Series versions prior to 1.2, NPort 5450AI-M12 Series versions prior to 1.2, NPort 5600-8-DT Series versions prior to 2.4, NPort 5600-8-DTL Series versions prior to 2.4, NPort 6x50 Series versions prior to 1.13.11, NPort IA5450A versions prior to v1.4. Administration passwords can be retried without authenticating.

Severity breakdown

CVSS v3.0 9.8: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-287: Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

CWE-307: Improper Restriction of Excessive Authentication Attempts

The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.

Affected products

  • Moxa Nport 5100 Series Firmware: up to and including 2.5; up to and including 3.5
  • Moxa Nport 5200 Series Firmware: up to and including 2.7
  • Moxa Nport 5400 Series Firmware: up to and including 3.10
  • Moxa Nport 5600 Series Firmware: up to and including 3.6
  • Moxa Nport 5100a Series Firmware: up to and including 1.2
  • Moxa Nport P5150a Series Firmware: up to and including 1.2
  • Moxa Nport 5200a Series Firmware: up to and including 1.2
  • Moxa Nport 5x50a1 M12 Series Firmware: up to and including 1.1
  • Moxa Nport 5600 8 Dtl Series Firmware: up to and including 2.3
  • Moxa Nport 6100 Series Firmware: up to and including 1.13

References