module

MediaWiki SVG XML Entity Expansion Remote File Access

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Disclosed
N/A
Created
May 30, 2018

Description

This module attempts to read a remote file from the server using a vulnerability
in the way MediaWiki handles SVG files. The vulnerability occurs while trying to
expand external entities with the SYSTEM identifier. In order to work MediaWiki must
be configured to accept upload of SVG files. If anonymous uploads are allowed the
username and password aren't required, otherwise they are. This module has been
tested successfully on MediaWiki 1.19.4, 1.20.3 on Ubuntu 10.04 and Ubuntu 12.10.
Older versions were also tested but do not seem to be vulnerable to this vulnerability.
The following MediaWiki requirements must be met: File upload must be enabled,
$wgFileExtensions[] must include 'svg', $wgSVGConverter must be set to something
other than 'false'.

Authors

Daniel Franke
juan vazquez juan.vazquez@metasploit.com
Christian Mehlmauer FireFart@gmail.com

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


    msf > use auxiliary/scanner/http/mediawiki_svg_fileaccess
    msf auxiliary(mediawiki_svg_fileaccess) > show actions
        ...actions...
    msf auxiliary(mediawiki_svg_fileaccess) > set ACTION < action-name >
    msf auxiliary(mediawiki_svg_fileaccess) > show options
        ...show and set options...
    msf auxiliary(mediawiki_svg_fileaccess) > run
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