Two XSS vulnerabilities in Simple Security WordPress Plugin

[High-Tech Bridge Security Research <advisory@xxxxxxxxxxxx>]

Advisory ID: HTB23244
Product: Simple Security WordPress Plugin
Vendor: MyWebsiteAdvisor 
Vulnerable Version(s): 1.1.5 and probably prior
Tested Version: 1.1.5
Advisory Publication:  December 17, 2014  [without technical details]
Vendor Notification: December 17, 2014 
Public Disclosure: January 14, 2015 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2014-9570
Risk Level: Low 
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status: Solution Available
Discovered and Provided: High-Tech Bridge Security Research Lab ( 
https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered two XSS vulnerabilities in 
Simple Security WordPress plugin, which can be exploited to perform Cross-Site 
Scripting attacks against administrators of WP websites with the vulnerable 
plugin.


1) Two Cross-Site Scripting (XSS) Vulnerabilities in Simple Security Wordpress 
Plugin: CVE-2014-9570

The discovered vulnerabilities can be used by attackers to steal 
administrator's cookies of a vulnerable website. This can lead to total website 
compromise. 

Attackers can also perform drive-by-download attacks against website admin by 
injecting malware or exploit-packs into vulnerable scripts.

1.1 User-supplied input passed via the "datefilter" HTTP GET parameter to 
"/wp-admin/users.php" script is not properly sanitised before being returned to 
the administrator. A remote attacker can trick a logged-in administrator to 
open a specially crafted link and execute arbitrary HTML and script code in his 
browser in the context of the vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to 
display "ImmuniWeb" word:

http://[host]/wp-admin/users.php?page=access_log&datefilter=%27%22%3E%3Cscript%3Ealert%28/ImmuniWeb/%29;%3C/script%3E

1.2 User input passed via the "simple_security_ip_blacklist[]" HTTP POST 
parameter to "/wp-admin/users.php" script is not properly filtered before being 
returned to the administrator. A remote attacker can trick a logged-in 
administrator to open a specially crafted link and execute arbitrary HTML and 
script code in browser in context of the vulnerable website.

Below we provide a basic XSS exploit that uses JS "alert()" function to display 
"ImmuniWeb" pop-up:


<form action="http://[host]/wp-admin/users.php?page=ip_blacklist"; method="post" 
name="main">
<input type="hidden" name="page" value="access_log">
<input type="hidden" name="action" value="add_blacklist_ip">
<input type="hidden" name="simple_security_ip_blacklist[]" 
value="'><script>alert('ImmuniWeb');</script>">
<input type="submit" id="btn">
</form>


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Solution:

Disclosure timeline:
2014-12-17 Vendor Alerted via contact form.
2014-01-02 Vendor Alerted via contact form and emails.
2014-01-12 Fix Requested via contact form and emails.
2014-01-14 Public disclosure with self-written patch.

Currently we are not aware of any official solution for this vulnerability.
Unofficial patch was developed by High-Tech Bridge Security Research Lab and is 
available here: https://www.htbridge.com/advisory/HTB23244-patch.zip

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References:

[1] High-Tech Bridge Advisory HTB23244 - 
https://www.htbridge.com/advisory/HTB23244 - Two XSS vulnerabilities in Simple 
Security WordPress plugin.
[2] Simple Security Wordpress Plugin - http://mywebsiteadvisor.com/ - Simple 
Security Plugin for WordPress is a basic Access Log system that can monitor 
successful and failed login attempts and block IP addresses.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - 
international in scope and free for public use, CVE® is a dictionary of 
publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to 
developers and security practitioners, CWE is a formal list of software 
weakness types.
[5] ImmuniWeb® SaaS - https://www.htbridge.com/immuniweb/ - hybrid of manual 
web application penetration test and cutting-edge vulnerability scanner 
available online via a Software-as-a-Service (SaaS) model.

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Disclaimer: The information provided in this Advisory is provided "as is" and 
without any warranty of any kind. Details of this Advisory may be updated in 
order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.