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Linksys WRT54G Cross Site Scripting

Linksys WRT54G Cross Site Scripting
Posted Apr 29, 2011
Authored by Justin C. Klein Keane

The Cisco Linksys Wireless G Broadband Router WRT54G with firmware version 4.21.1 suffers from a cross site scripting vulnerability.

tags | exploit, xss
systems | cisco
SHA-256 | 33023e6063d14ffdaada37d384498349e1d019e88d22a6bd58eef458b22376b7

Linksys WRT54G Cross Site Scripting

Change Mirror Download
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Description of Vulnerability:
- -----------------------------
Linksys WRT54G is a consumer wireless G broadband router and four port
switch (http://www.linksysbycisco.com/ANZ/en/support/WRT54G). The
device provides an administration interface for configuration via a web
browser. Unfortunately the interface does not sanitize keywords for
safe browsing leading to a stored/persistent cross site scripting (XSS)
vulnerability.

Systems affected:
- -----------------
Cisco Linksys Wireless G Boradband Router WRT54G with firmware version
4.21.1 was tested and found to be vulnerable.

Proof of Concept:
- -----------------
1. Log into the WRT54G administration screen and navigate to /Filters.asp
2. Enter "' onBlur='alert("xss")" for the "Website Blocking by Keyword"
value.
3. Click the 'Save Settings' button at the bottom of the form, ignore
the error and click 'Continue'
4. After the page refreshes click on the "Website Blocking by Keyword"
textfield then click outside to view the JavaScript alert

- --
Justin Klein Keane
http://www.MadIrish.net

The digital signature on this e-mail may be confirmed using the
PGP key located at: http://www.madirish.net/gpgkey
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