Design/Logic Flaw

Certain Zyxel products have a locally accessible binary that allows a non-root user to generate a password for an undocumented user account that can be used for a TELNET session as root. This affects NAS520 V5.21AASZ.4C0, V5.21AASZ.0C0, V5.11AASZ.3C0, and V5.11AASZ.0C0; NAS542 V5.11ABAG.0C0,...