However, not all devices are running a vulnerable firmware version.īecause the zyfwp user account has admin privileges, exploitation could lead to compromised “confidentiality, integrity and availability of the device,” the researcher says. The security researcher notes that over 100.000 Zyxel USG/ATP/VPN devices worldwide appear to have their web interface exposed to the Internet. However, other vulnerabilities were found to impact previous firmware releases. In earlier firmware versions, the account did not have a password, with the security bug seemingly introduced in the latest firmware iteration. The vulnerability is tracked as CVE-2020-29583.
#Upgrade zyxel firmware through ftp password
The account, which has admin privileges, is not visible on the interface, and the device owner cannot change the password for it. While doing research on his personal Zyxel firewall, the security researcher discovered not only that the problematic user account exists with hardcoded credentials, but also that the account works both on SSH and the web interface. The account was designed for the delivery of automatic firmware updates through FTP and is present on Zyxel USG, ATP, VPN, ZyWALL, and USG FLEX devices. Identified by EYE security researcher Niels Teusink, the vulnerability exists because the password for the “zyfwp” user account was stored in plaintext and was visible in one of the binaries on the system. Several Zyxel firewall and WLAN controller products contain hardcoded credentials for an undocumented user account that has admin privileges.
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