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Tiki Wiki <= 8.3 unserialize() PHP Code Execution
Posted Jul 6, 2012
Authored by EgiX, juan vazquez | Site metasploit.com

This Metasploit module exploits a php unserialize() vulnerability in Tiki Wiki <= 8.3 which could be abused to allow unauthenticated users to execute arbitrary code under the context of the webserver user. The dangerous unserialize() exists in the 'tiki-print_multi_pages.php' script, which is called with user controlled data from the 'printpages' parameter. The exploit abuses the __destruct() method from the Zend_Pdf_ElementFactory_Proxy class to write arbitrary PHP code to a file on the Tiki Wiki web directory. In order to run successfully three conditions must be satisfied (1) display_errors php setting must be On to disclose the filesystem path of Tiki Wiki, (2) The Tiki Wiki Multiprint feature must be enabled to exploit the unserialize() and (3) a php version older than 5.3.4 must be used to allow poison null bytes in filesystem related functions. The exploit has been tested successfully on Ubuntu 9.10 and Tiki Wiki 8.3.

tags | exploit, web, arbitrary, php
systems | linux, ubuntu
advisories | CVE-2012-0911
SHA-256 | 04e6daabf6b6a5dba1b8fa576bc4f910b4df1c7b90652847142a832796744523

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