CVE-2020-29583 Information

Description

Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://www.zyxel.com/support/security_advisories.shtml https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15 http://ftp.zyxel.com/USG40/firmware/USG40_4.60(AALA.1)C0_2.pdf https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html https://www.zyxel.com/support/CVE-2020-29583.shtml

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8