Quantum Secular Labs / Blog / Advisories

CVE-2018-20398: Skyworth CM5100 V1.1.0, CM5100-440 V1.2.1, CM5100-511 4.1.0.14, CM5100-GHD00 V1.2.2, and CM5100.g2 4.1.0.17…

CVE-2018-20398 is rated critical with a CVSS v3.0 base score of 9.8 and NVD lists 5 affected products, including Skyworthdigital Cm5100 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

Skyworth CM5100 V1.1.0, CM5100-440 V1.2.1, CM5100-511 4.1.0.14, CM5100-GHD00 V1.2.2, and CM5100.g2 4.1.0.17 devices allow remote attackers to discover credentials via iso.3.6.1.4.1.4491.2.4.1.1.6.1.1.0 and iso.3.6.1.4.1.4491.2.4.1.1.6.1.2.0 SNMP requests.

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-522: Insufficiently Protected Credentials

The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.

Affected products

Skyworthdigital Cm5100 Firmware: 1.1.0
Skyworthdigital Cm5100 440 Firmware: 1.2.1
Skyworthdigital Cm5100 511 Firmware: 4.1.0.14
Skyworthdigital Cm5100 Ghd00 Firmware: 1.2.2
Skyworthdigital Cm5100.G2 Firmware: 4.1.0.17