Vulnerability Details

Westermo WeOS Hard-coded Certificate Vulnerability

Published: 2016-08-24 04:49:27
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:M/Au:N/C:C/I:C/A:C

Detection Type:
Remote Banner

Solution Type:
Vendor Patch

Summary:
Westermo WeOS uses the same SSL private key across different customers installations.

Technical Details:
The SSL keys used by the switches to provide secure communications are hard coded. Malicious parties could obtain the key, stage a Man-in-the-Middle attack posing to be a WeOS device, and then obtain credentials entered by the end-user. With those credentials, the malicious party would have authenticated access to that device.

Impact:
Certificates provide a key used by the switch software to encrypt and decrypt communications. The detrimental impact of the certificate being hard coded is that the key cannot be changed. Once the key is compromised, a malicious party has access to the decrypted network traffic from the device. A malicious party can then read and modify traffic that is intercepted and decrypted.

Affected Versions:
WeOS versions older than Version 4.19.0

Recommendations:
Westermo has released a patch that allows changing default certificates to custom certificates.

Detection Method:
Checks if a vulnerable version is present on the target host.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2015-7923

References:

https://ics-cert.us-cert.gov/advisories/ICSA-16-028-01

Severity
High
CVSS Score
9.3
Published
2016-08-24
Modified
2018-10-25
Category
General

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