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WordPress 4.5.3 Cross Site Scripting

WordPress 4.5.3 Cross Site Scripting
Posted Sep 9, 2016
Authored by Han Sahin

WordPress version 4.5.3 suffers from a cross site scripting vulnerability when an uploaded image filename has a malicious payload inserted.

tags | exploit, xss
MD5 | 0161ac0b585bf93aafacc9cd06d0582a

WordPress 4.5.3 Cross Site Scripting

Change Mirror Download
------------------------------------------------------------------------
Persistent Cross-Site Scripting vulnerability in WordPress due to unsafe
processing of file names
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Han Sahin, July 2016

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Abstract
------------------------------------------------------------------------
A persistent Cross-Site Scripting (XSS) vulnerability has been found in
WordPress. An attacker can create a specially crafted image file name
which, when uploaded in WordPress, injects malicious JavaScript code
into the application. An attacker can use this vulnerability to perform
a wide variety of actions, such as stealing victims' session tokens or
login credentials, and performing arbitrary actions on their behalf.

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OVE ID
------------------------------------------------------------------------
OVE-20160724-0018

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Tested versions
------------------------------------------------------------------------
This issue was successfully tested on WordPress 4.5.3.

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Fix
------------------------------------------------------------------------
This vulnerability is resolved in WordPress 4.6.1 (Release Notes).

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Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/persistent_cross_site_scripting_vulnerability_in_wordpress_due_to_unsafe_processing_of_file_names.html

When an image with a file name such as cengizhansahinsumofpwn<img src=a onerror=alert(document.cookie)>.jpg is uploaded and viewed within WordPress the script code is executed

------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.
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