Apache 'printenv' Script Input Validation Bugs in Older Versions May Let Remote Users Conduct Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1005848 |
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Updated: Dec 23 2002
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Original Entry Date: Dec 23 2002
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Impact: Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
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Exploit Included: Yes
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Description: An input validation vulnerability was reported in the 'printenv' test script distributed with the Apache web server [apparently affecting old versions]. A remote user can conduct cross-site scripting attacks against Apache users.
It is reported that older versions of the 'printenv' test CGI script does not filter HTML code from user-supplied 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 printenv script 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.
A demonstration exploit URL is provided in the Source Message.
Another user reports that "moderately
recent" versions are not affected and that the script is not configured with executable permissions by default in recent versions
of Apache.
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Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the
printenv cgi script, 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.
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Solution: No solution was available at the time of this entry.
The author recommends removing the script.
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Vendor URL: www.apache.org/ (Links to External Site)
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Cause: Input validation error
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Underlying OS: Linux (Any), UNIX (Any)
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Reported By: "Dr.Tek" <tek@superw00t.com>
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Message History:
None.
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Source Message Contents
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Date: 22 Dec 2002 21:49:58 -0000
From: "Dr.Tek" <tek@superw00t.com>
Subject: 'printenv' XSS vulnerability
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***** This writing is part of Malloc() Hackers & Malloc() Security *****
http://www.mallochackers.com
http://www.superw00t.com
************************************************************************
Title: 'printenv' XSS vulnerability
~~~~~
Author: Dr.Tek of Malloc()
~~~~~~
Contact: "Dr.Tek" - (tek@superw00t.com)
~~~~~~~
No modification of the contents of this file should be made
without direct consent of the author or of Malloc() hackers or
Malloc() Security.
************************************************************************
'printenv' is a test CGI script that tends to come default with most
Apache installation. Usually located in the "/cgi-bin/" directory.
An XSS vulnerbility exist which will allow anyone to input specially
crafted links and/or other malicious/obscene scripts.
Example exploitation:
http://www.w00tw00t.com/cgi-bin/printenv/<a href="bad">If you see this
error, Click here!</a>
Fix:
Since 'printenv' is just an example CGI script that has no real use and
has its own problems. Just remove it.
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