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Topic :

phpBB Admin command execution

SecurityAlert : 762

CVE : CVE-2006-1896

SecurityRisk : Medium Security Risk Medium

(About)

Remote Exploit : Yes

Local Exploit : Yes

Exploit Given : No

Credit : noch22 gmail com

Published : 23.04.2006

Affected Software :

phpBB

Advisory Text :

On a phpBB board, a user having access to the admin panel is able to
execute PHP code:

This example will execute $user_sig as PHP code:

Go to Administration Panel > Styles Admin > Management > subSilver > Edit
Set "Font Colour 3" to "'./*"
Profile
Set Signature to
"$fd=fopen($phpbb_root_path.'config.php','rb');while(!feof($fd)){echo
htmlspecialchars(fgets($fd));}"
Post a new message with content:
"*/var_dump(eval($user_sig)).flush().die().'" and attach your signature
Go to your message adding ?highlight=1 to URL
Your signature is executed as PHP code

Possible solution:

Replace $theme['fontcolor3']
By preg_replace('#[^a-f0-9]+#i','',$theme['fontcolor3']);
In viewtopic.php

Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.

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