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CVE-2018-19989

Description

In the /HNAP1/SetQoSSettings message, the uplink parameter is vulnerable, and the vulnerability affects D-Link DIR-822 Rev.B 202KRb06 and DIR-822 Rev.C 3.10B06 devices. In the SetQoSSettings.php source code, the uplink parameter is saved in the /bwc/entry:1/bandwidth and /bwc/entry:2/bandwidth internal configuration memory without any regex checking. And in the bwc_tc_spq_start, bwc_tc_wfq_start, and bwc_tc_adb_start functions of the bwcsvcs.php source code, the data in /bwc/entry:1/bandwidth and /bwc/entry:2/bandwidth is used with the tc command without any regex checking. A vulnerable /HNAP1/SetQoSSettings XML message could have shell metacharacters in the uplink 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/pr0v3rbs/FirmAE

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