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Category:   Application (Web Server/CGI)  >   IBM HTTP Server (IHS) Vendors:   IBM
IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1016569
SecurityTracker URL:  http://securitytracker.com/id/1016569
CVE Reference:   CVE-2006-3918   (Links to External Site)
Updated:  Aug 11 2006
Original Entry Date:  Jul 25 2006
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  Exploit Included:  Yes  
Version(s): prior to 2.0.47.1, also 1.3.x
Description:   A vulnerability was reported in IBM HTTP Server (IHS). A remote user can conduct cross-site scripting attacks.

The server does not properly filter HTML code from user-supplied input in the HTTP Expect header before displaying the input. A remote user can creat a specially crafted value that, when submitted 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 IBM HTTP Server (IHS) 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.

The Apache web server is also affected.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the IBM HTTP Server (IHS) 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 (PK25355 2.0.47.1 and PK27875 1.3.28.1).

The IBM advisories are available at:

http://www-1.ibm.com/support/docview.wss?uid=swg1PK24631
http://www-1.ibm.com/support/docview.wss?uid=swg24013080

Vendor URL:  www-1.ibm.com/support/docview.wss?uid=swg1PK24631 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (AIX), UNIX (HP/UX), UNIX (Solaris - SunOS), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 8 2006 (Red Hat Issues Fix for Apache) IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks
Red Hat has released a fix for Apache on Red Hat Enterprise Linux 2.1.
Aug 11 2006 (Red Hat Issues Fix for Apache httpd) IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks
Red Hat has released a fix for Apache httpd on Red Hat Enterprise Linux 3 and 4.
Oct 3 2006 (Red Hat Issues Fix for Stronghold) IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks
Red Hat has issued a fix for Red Hat Stronghold for Enterprise Linux.
Oct 8 2006 (OpenBSD Issues Fix for httpd) IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks
OpenBSD has issued a fix for httpd.
Feb 4 2008 (IBM Issues Fix for OS/400) IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks
IBM has issued a fix for OS/400.



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