Original release date: February 16, 2016
Last revised: February 16, 2016
Discovered by: José Antonio Pérez Piedra
Severity: 6.1/10 (CVSSv3 Base Metrics)
Desk(.)com is a help desk solution which allows companies to handle both traditional 1-to-1 communications as well as monitor and respond to social media. It also provides email support system and knowledgebase.
Desk(.)com is affected by Reflected Cross-Site Scripting vulnerability in the email contact form. The vulnerable resource does not properly check the type of the parameters passed to the application through GET requests. It allows malicious users to bypass the sanitizer and execute arbitrary HTML/script code in the context of the victim's browser.
PROOF OF CONCEPT
The affected resource is: /customer/portal/emails/new All GET parameters are affected by this vulnerability, for example: email[body] email[subject] interaction[email] interaction[name] The application does not filter the parameters if they are passed as nested arrays and reflects its content in the response. Here is a PoC: ⁄customer⁄portal⁄emails⁄new?email[body]=&email[subject]=asd'> <img onerror="prompt(1)" src="x" ⁄>&interaction[email]=&interaction[name]=
An attacker can execute arbitrary HTML or script code in a targeted user's browser, this can leverage to steal sensitive information as user credentials, personal data, etc.
This vulnerability have been corrected.
See Proof of Concept of exploitation in our Youtube channel.
This vulnerability has been discovered by José Antonio Pérez Piedra, japerez (at) isecauditors (dot) com.
February 16, 2016: Initial release
November 4, 2015: Vulnerability acquired by Internet Security Auditors
November 6, 2015 Contact with Desk.com Security Team
December 1, 2015: Internet Security Auditors confirm that the bug have bveen corrected.
February 16, 2016: Advisory published.
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Internet Security Auditors accepts no responsibility for any damage caused by the use or misuse of this information.
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