Secret Backdoor Account Found in Several Zyxel Firewall, VPN Products
Jan 01, 2021
 Zyxel has released a patch to address a critical vulnerability in its firmware concerning a hardcoded, undocumented secret account that could be abused by an attacker to login with administrative privileges and compromise its networking devices.  The flaw, tracked as  CVE-2020-29583  (CVSS score 7.8), affects  version 4.60  present in a wide-range of Zyxel devices, including Unified Security Gateway (USG), USG FLEX, ATP, and VPN firewall products.   EYE researcher  Niels Teusink  reported the vulnerability to Zyxel on November 29, following which the company released a firmware patch (ZLD V4.60 Patch1) on December 18.  According to the  advisory  published by Zyxel, the undocumented account ("zyfwp") comes with an unchangeable password that's not only stored in plaintext but could also be used by a malicious third-party to login to the SSH server or web interface with admin privileges.  Zyxel said the hardcoded credentials were put in place to de...