An issue was discovered on Mofi Network MOFI4500-4GXeLTE 4.0.8-std devices. A format error in /etc/shadow, coupled with a logic bug in the LuCI - OpenWrt Configuration Interface framework, allows the undocumented system account mofidev to login to the cgi-bin/luci/quick/wizard management interface without a password by abusing a forgotten-password feature.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-13859
• https://mofinetwork.com/index.php?main_page=page&id=14
• https://www.criticalstart.com/critical-vulnerabilities-discovered-in-mofi-routers/