SB2020122410 - Backdoor account in several Zyxel products

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Main Vulnerability Database SB2020122410

SB2020122410 - Backdoor account in several Zyxel products

Published: December 24, 2020

Security Bulletin ID SB2020122410
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use of hard-coded credentials (CVE-ID: CVE-2020-29583)

CWE-ID: CWE-798 - Use of Hard-coded Credentials

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red


The vulnerability allows a remote attacker to gain full access to vulnerable system.

The vulnerability exists due to presence of hard-coded account zyfwp with an unchangeable password. A remote unauthenticated attacker can access the affected system via ssh or web interface using the hard-coded credentials and gain administrative privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Remediation

Install update from vendor's website.

References