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WordPress Activity Log 2.3.1 Persistent Cross Site Scripting

WordPress Activity Log 2.3.1 Persistent Cross Site Scripting
Posted Jul 11, 2016
Authored by Han Sahin

WordPress Activity Log plugin version 2.3.1 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 736e891187f3de875921d045817d118b

WordPress Activity Log 2.3.1 Persistent Cross Site Scripting

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Persistent Cross-Site Scripting in WordPress Activity Log plugin
Han Sahin

Abstract

A stored Cross-Site Scripting (XSS) vulnerability has been found in the WordPress Activity Log plugin. By using this vulnerability an attacker can inject malicious JavaScript code into the application, which will execute within the browser of any user who views the Activity Log, in general WP admin.

Tested versions

This issue was successfully tested on WordPress Activity Log plugin version 2.3.1.

Fix

This issue has been fixed in version 2.3.2 of the WordPress Activity Log plugin. The updated plugin can be downloaded from the following location: https://downloads.wordpress.org/plugin/aryo-activity-log.2.3.2.zip.

Introduction

The WordPress Activity Log plugin allows monitoring and tracking of site activity on a WordPress site. A stored Cross-Site Scripting vulnerability has been discovered in the WordPress Activity Log plugin which allows an unauthenticated attacker to inject malicious JavaScript code into the application, which will execute within the browser of any user who views the Activity Log (WP admin).

Details

The WordPress Activity Log plugin fails to sufficiently check input supplied to the X-Forwarded-For HTTP header and perform output encoding when the input is presented in a "wrong password event". As a result the malicious request will be stored in the Activity Log page, executing the payload when an unsuspecting user views this specific page.

An attacker can use this vulnerability to perform a wide variety of actions, such as stealing victims' session tokens or login credentials, performing arbitrary actions on their behalf, and logging their keystrokes or deliver malware.

Persistent Cross-Site scripting flaws are typically more serious than reflected vulnerabilities because they do not require a separate delivery mechanism in order to reach target users (victims).


Proof of concept

This vulnerability can be demonstrated by submitting an XFF header similar to the following:

POST /wp-login.php HTTP/1.1
Host: 192.168.28.135
Content-Length: 113
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Referer: http://
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8,nl;q=0.6
X-Forwarded-For: <script>alert(document.cookie);</script>
Connection: close

log=wordpress&pwd=sdsdssdsdsd&wp-submit=Log+In&redirect_to=http%3A%2F%2F192.168.28.135%2Fwp-admin%2F&testcookie=1


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