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Category:   Application (Web Server/CGI)  >   IBM HTTP Server (IHS) Vendors:   IBM
(OpenBSD Issues Fix for httpd) IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1017011
SecurityTracker URL:  http://securitytracker.com/id/1017011
CVE Reference:   CVE-2006-3918   (Links to External Site)
Updated:  Aug 18 2007
Original Entry Date:  Oct 8 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  
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. OpenBSD httpd is affected.

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:   OpenBSD has issued a fix for httpd.

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.8/common/017_httpd2.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/012_httpd2.patch

Vendor URL:  www-1.ibm.com/support/docview.wss?uid=swg1PK24631 (Links to External Site)
Cause:   Input validation error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  3.8, 3.9

Message History:   This archive entry is a follow-up to the message listed below.
Jul 25 2006 IBM HTTP Server (IHS) Lack of Input Validation in Expect Header May Permit Cross-Site Scripting Attacks



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