PT-2011-01: Cross-Site Scripting in Kayako Support Suite

Vulnerable software

Kayako Support Suite
Version: 3.70.02-stable and earlier

Application link:
http://www.kayako.com/

Severity level

Severity level: Medium
Impact: Cross-Site Scripting
Access Vector: Network exploitable

CVSS v2:
Base Score: 4.3
Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVE: not assigned

Software description

Kayako Support Suite is a HelpDesk system.

Vulnerability description

Positive Research Center has discovered XSS in Kayako Support Suite.

Application insufficiently verifies incoming data in "Subject" parameter in LiveSupport module.
An attacker can use the vulnerability to inject and execute HTML code and scripts in a user's browser within the trust relationship between the browser and the server.
An attack can be successful if administrator deletes a message created by user via Delete button of Options section of the message.

Application insufficiently verifies incoming data in "Full Name" and "Subject" parameters in Tickets module.
An attacker can use the vulnerability to inject and execute HTML code and scripts in a user's browser within the trust relationship between the browser and the server.
An attack can be successful if administrator views task information via popup menu.

Application insufficiently verifies incoming data in "Full Name" parameter in Kayako Support Suite (Tickets, News, Knowledgebase) modules.
An attacker can use the vulnerability to inject and execute HTML code and scripts in a user's browser within the trust relationship between the browser and the server.
A user can be successfully attacked via Tickets module if the user opens a page with opened tasks and if an attacker creates a task with special characters on behalf of the user.
Other modules can execute arbitrary HTML code in a user's browser while viewing comments to any articles if an attacker manages to modify "Full Name" value for the current user.

How to fix

Update your software up to the v4

Advisory status

25.11.2011 - Vendor is notified
25.11.2011 - Vendor gets vulnerability details
25.08.2011 - Vendor releases fixed version and details
29.12.2011 - Public disclosure

Credits

The vulnerability was discovered by Yuri Goltsev, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2011-01

Reports on the vulnerabilities previously discovered by Positive Research:

http://www.ptsecurity.com/advisory1.aspx
http://en.securitylab.ru/lab/

Threatscape