Reflected Cross-Site Scripting (XSS) in SourceBans

[High-Tech Bridge Security Research <advisory () htbridge ch>]

Advisory ID: HTB23273
Product: SourceBans
Vendor: Sourcebans team
Vulnerable Version(s): 1.4.11 and probably prior
Tested Version: 1.4.11
Advisory Publication:  October 2, 2015  [without technical details]
Vendor Notification: October 2, 2015 
Public Disclosure: October 23, 2015 
Vulnerability Type: Cross-Site Scripting [CWE-79]
Risk Level: Medium 
CVSSv3 Base Score: 6.1 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N]
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 vulnerability in SourceBans, which can be exploited to perform 
Cross-Site Scripting (XSS) attacks against web application users. 

The vulnerability exists due to insufficient filtration of input-data passed via the "advSearch" HTTP GET parameter to 
"/index.php" script when "p" parameter is set to 'banlist'. A remote unauthenticated attacker can trick a any user to 
open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable 
website. 

This vulnerability can be used in an advanced attack to compromise the web application and gain control over services 
within the local network. 

A simple exploit below will display a JS popup with "ImmuniWeb" word:

http://[host]/index.php?p=banlist&advSearch=0%27%22%3E%3Cimg+src=x+onerror=alert%28/ImmuniWeb/%29%3E&advType=btype





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References:

[1] High-Tech Bridge Advisory HTB23273 - https://www.htbridge.com/advisory/HTB23273 - Reflected Cross-Site Scripting 
(XSS) in SourceBans.
[2] SourceBans - http://www.sourcebans.net/ - When running SourceBans web interface and the SourceMod plugin together, 
you will be able to instantly ban people from all of the servers you have added into the system. 
[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.