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Message-ID: <4DB99FFD.9080401@madirish.net> Date: Thu, 28 Apr 2011 13:12:29 -0400 From: Justin Klein Keane <justin@...irish.net> To: full-disclosure@...ts.grok.org.uk Subject: Cisco Linksys WRT54G XSS Vulnerability -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iPwEAQECAAYFAk25n/kACgkQkSlsbLsN1gBrhgb/XGXxT9qHwKE6mb9yGuWZDjZA LXM+tK9/0JNoU+yNiXopztFKpB1dsYt5Rbo6zYSOirJmL4C4/DRqmtj8eHNLCPuw bJ5GsF9oICZ3CdMj5k6IA3d0THM32WA1G+rxKPAGFPpHNr3rVBRZuvki1jENJLXo 2VN45dRu8+z/Zcp7RMMN/hcTqdAzL95dUIR/XmShSOGoRv9coG+JscCBCfU+jy2K ZcaXussmPWihBe1y+pJknm/tf70yxhoR1HD1i/Cv4Sss+BC+LRtl1ofht84hwFVy yPY43N+81fdZjYxg54Q= =sDiu -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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