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CVE-2018-19986

Description

In the /HNAP1/SetRouterSettings message, the RemotePort parameter is vulnerable, and the vulnerability affects D-Link DIR-818LW Rev.A 2.05.B03 and DIR-822 B1 202KRb06 devices. In the SetRouterSettings.php source code, the RemotePort parameter is saved in the $path_inf_wan1."/web" internal configuration memory without any regex checking. And in the IPTWAN_build_command function of the iptwan.php source code, the data in $path_inf_wan1."/web" is used with the iptables command without any regex checking. A vulnerable /HNAP1/SetRouterSettings XML message could have shell metacharacters in the RemotePort element such as the `telnetd` string.

POC

Reference

- https://github.com/pr0v3rbs/CVE/tree/master/CVE-2018-19986%20-%2019990

Github

- https://github.com/ARPSyndicate/cvemon

- https://github.com/George-RG/FirmaInc

- https://github.com/SexyBeast233/SecBooks

- https://github.com/XinRoom/dir2md

- https://github.com/pr0v3rbs/FirmAE

- https://github.com/sinword/FirmAE_Connlab