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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
Ruby WEBrick Server Input Validation Flaw in Error Pages Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1024105
SecurityTracker URL:  http://securitytracker.com/id/1024105
CVE Reference:   CVE-2010-0541   (Links to External Site)
Updated:  Aug 16 2010
Original Entry Date:  Jun 16 2010
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.8.6-p399, 1.8.7-p299, 1.9.1-p429, 1.9.2 RC2; and prior releases
Description:   A vulnerability was reported in the Ruby WEBrick server. A remote user can conduct cross-site scripting attacks.

The Ruby WEBrick HTTP server error pages do not properly filter HTML code from user-supplied input before displaying the input. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Ruby software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Apple reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Ruby software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   The vendor has issued a fix (1.8.7 patchlevel 302, 1.9.1 patchlevel 430).

The vendor's advisory is available at:

http://www.ruby-lang.org/en/news/2010/08/16/xss-in-webrick-cve-2010-0541/

Vendor URL:  www.ruby-lang.org/en/news/2010/08/16/xss-in-webrick-cve-2010-0541/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 16 2010 (Apple Issues Fix) Ruby WEBrick Server Input Validation Flaw in Error Pages Permits Cross-Site Scripting Attacks
Apple has issued a fix for Mac OS X.
Jun 28 2011 (Red Hat Issues Fix) Ruby WEBrick Server Input Validation Flaw in Error Pages Permits Cross-Site Scripting Attacks
Red Hat has issued a fix for Red Hat Enterprise Linux 4.
Jun 28 2011 (Red Hat Issues Fix) Ruby WEBrick Server Input Validation Flaw in Error Pages Permits Cross-Site Scripting Attacks
Red Hat has issued a fix for Red Hat Enterprise Linux 5.



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