title: Yellowbrik PEC-1864 authentication bypass
description: Yellobrik PEC-1864 implements authentication checks via javascript in the frontend interface.  When the device can be accessed over the network an attacker could bypass authentication.
This would allow an attacker to :
- Change the password, resulting in a DOS of the users
- Change the streaming source, compromising the integrity of the stream
- Change the streaming destination, compromising the confidentiality of the stream
This issue affects Yellowbrik: PEC 1864. No patch has been issued by the manufacturer as this model was discontinued.
problem types: CWE-602: Client-Side Enforcement of Server-Side Security
affected:
{
defaultStatus: affected
product: Yellowbrik
vendor: Lynx Technik AG
versions:
status: affected, version: PEC 1864
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.8
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL
workarounds: isolate the PEC-1864 behind a firewall disallowing any traffic on the web interface, do not allow access from internet.