FIberHome AN5506-04-FA / HG6245D Routers Remote Stack Overflow

FiberHome AN5506-04-FA firmware versions up to and including RP2631 and HG6245D prior to RP2602 contain a stack-based buffer overflow, as the HTTP service ('webs') fails to enforce maximum lengths for Cookie header values. When a cookie longer than 511 bytes is processed, a stack buffer is overrun, leading to a crash or potential control of execution flow.

An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to crash the telnet daemon by sending a certain 0a 65 6e 61 62 6c 65 0a 02 0a 1a 0a string.

An issue was discovered on FiberHome HG6245D devices through RP2613. Some passwords are stored in cleartext in nvram.

An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to bypass authentication by sending the decoded value of the GgpoZWxwCmxpc3QKd2hvCg== string to the telnet server.

An issue was discovered on FiberHome HG6245D devices through RP2613. wifictl_5g.cfg has cleartext passwords and 0644 permissions.

An issue was discovered on FiberHome HG6245D devices through RP2613. wifictl_2g.cfg has cleartext passwords and 0644 permissions.

An issue was discovered on FiberHome HG6245D devices through RP2613. wifi_custom.cfg has cleartext passwords and 0644 permissions.

An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0&key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).

An issue was discovered on FiberHome HG6245D devices through RP2613. A hardcoded GEPON password for root is defined inside /etc/init.d/system-config.sh.

An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a Linux telnetd as root on port 26/tcp by using the CLI interface commands of ddd and shell (or tshell).

An issue was discovered on FiberHome HG6245D devices through RP2613. By default, there are no firewall rules for IPv6 connectivity, exposing the internal management interfaces to the Internet.

An issue was discovered on FiberHome HG6245D devices through RP2613. There is a 6GFJdY4aAuUKJjdtSn7d password for the rdsadmin account.

An issue was discovered on FiberHome HG6245D devices through RP2613. There is a password of four hexadecimal characters for the admin account. These characters are generated in init_3bb_password in libci_adaptation_layer.so.

An issue was discovered on FiberHome HG6245D devices through RP2613. The password for the enable command is gpon.

An issue was discovered on FiberHome HG6245D devices through RP2613. The telnet daemon on port 23/tcp can be abused with the gpon/gpon credentials.

An issue was discovered on FiberHome HG6245D devices through RP2613. The web daemon contains the hardcoded admin / aisadmin credentials for an ISP.

An issue was discovered on FiberHome HG6245D devices through RP2613. The web daemon contains the hardcoded admin / tele1234 credentials for an ISP.

An issue was discovered on FiberHome HG6245D devices through RP2613. The web daemon contains the hardcoded user / tattoo@home credentials for an ISP.

An issue was discovered on FiberHome HG6245D devices through RP2613. The web daemon contains the hardcoded admin / 1234 credentials for an ISP.

An issue was discovered on FiberHome HG6245D devices through RP2613. The web daemon contains the hardcoded user / 888888 credentials for an ISP.