bugtraq - FlashCanvas 1.5 proxy.php XSS Vulnerability

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date: Wed, 11 Dec 2013 15:59:54 GMT
From: code@...ements.co.uk
To: bugtraq@...urityfocus.com
Subject: FlashCanvas 1.5 proxy.php XSS Vulnerability

Advisory Information

Title: FlashCanvas proxy.php XSS Vulnerability

Date published: 11 December 2013

Reference: CVE-2013-6880

Advisory Summary

Script does not adequately verify the Referer header before requesting (via curl) the remote URL specified in the ‘url’ GET parameter and rendering it.

Vendor

FlashCanvas.net <http://flashcanvas.net/>

Affected Software

FlashCanvas 1.5 and possibly older.

FlashCanvas is also used in other software frameworks such as WebShims, therefore the affected software maybe wider.

Description of Issue

The issue exists because the proxy.php script does not adequately verify the Referer header before requesting (via curl) the remote URL specified in the ‘url’ GET parameter and rendering it. This leads to some interesting possibilities, the one proved being cross-site scripting. 

More technical detail can be found here:
http://www.7elements.co.uk/resources/blog/cve-2013-6880-proof-concept/

Fix

We would recommend updating to version 1.6 http://flashcanvas.net/release/1.6