Document Title:
===============
Tenda, Dlink & Tplink TD-W8961ND - DHCP XSS Vulnerability
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1990
Release Date:
=============
2016-11-28
Vulnerability Laboratory ID (VL-ID):
====================================
1990
Common Vulnerability Scoring System:
====================================
3.5
Abstract Advisory Information:
==============================
The vulnerability laboratory research team discovered a persistent xss
vulnerability in the Tenda, Dlink & Tplink 1.0.1 TD-W8961ND & ADSL2+ Modem
Routers web-application.
Vulnerability Disclosure Timeline:
==================================
2016-11-28: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
Persistent cross site scripting vulnerability has been discovered in Tenda
1.0.1 ADSL Modem Routers.
The vulnerability allows remote attackers and local privileged account to
inject malicious script codes
on the application-side to manipulate the router dhcp hostnames.
Attackers are able to inject malicious code into the current list of DHCP
clients on view, by modifying
the DHCP hostname into valid xss payload. The execution of vulnerability occurs
on the application-side
on view events. Due to our investigation, we discovered that all models with
the firmware v1.x on the
web gui are affected by the security vulnerability. Remote attackers can for
example make special crafted
malicious pages with POST method requests to manipulate the dhcp hostname
listing and client view.
The security risk of the issue is estimated as medium with a cvss (common
vulnerability scoring system) count of 3.5.
Exploitation of the vulnerability requires no privilege web-application user
account and only low user interaction.
Successful exploitation of the vulnerability results in phishing attacks,
session hijacking, persistent external redirect
to malicious sources and persistent manipulation of affected or connected web
module context.
Request Method(s):
[+] POST
Vulnerable Module(s):
[+] DHCP Client List
[+] DHCP settings
Vulnerable Parameter(s):
[+] Hostnames
Proof of Concept (PoC):
=======================
Persistent vulnerability can be exploited by remote attackers with low
privileged application user account and low user interaction.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.
Manaul steps to reproduce the vulnerability ... (local)
1. Open the Router UI
2. Login as basic account
3. Open the DHCP List module via settings
4. Inject a payload to the hostnames input field
5. Save the input
6. Now the list becomes visible with all clients and the payload executes
within the context
7. Successful reproduce of the vulnerability!
The following code is a bash script working on supported Linux OS to change the
name of DHCP hostnames to a xss payload.
Save the file into vulnerablity.sh, then chmod +x vulnerability.sh.
PoC: Exploit
#!/bin/bash
GREEN=$(tput setaf 2 && tput bold)
BLUE=$(tput setaf 6 && tput bold)
echo $BLUE"[+] Persistent XSS DHCP Exploiter via Routers"
echo $GREEN"[+] Vulnerability founded by : Lawrence Amer "
echo -n $BLUE"[~] type XSS Payload here :"
read -e xss
echo $xss > /etc/hostname
echo $GREEN"[+]DHCP HOST NAME IS WRITTEN"
Video: https://www.youtube.com/watch?v=HUM5myJWbvc
Solution - Fix & Patch:
=======================
The xss vulnerability can be patched by a secure parse of the hostnames client
parameters.
Restrict the input and disallow the usage of special chars to prevent the
injection point.
Parse as well the hostnames output location in the active dhcp clients list.
Security Risk:
==============
The security risk of the persistent xss web vulnerability in the router
web-application is estimate as medium. (CVSS 3.5)
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Lawrence Amer
(https://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer)
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=========================
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