freescout-helpdesk freescout up to 1.8.127 /conversation/upload cross site scripting

Summaryinfo

A vulnerability was found in freescout-helpdesk freescout up to 1.8.127. It has been classified as problematic. The impacted element is an unknown function of the file /conversation/upload. The manipulation leads to cross site scripting. This vulnerability is traded as CVE-2024-29184. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in freescout-helpdesk freescout up to 1.8.127. It has been rated as problematic. This issue affects an unknown code block of the file /conversation/upload. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

FreeScout is a self-hosted help desk and shared mailbox. A Stored Cross-Site Scripting (XSS) vulnerability has been identified within the Signature Input Field of the FreeScout Application prior to version 1.8.128. Stored XSS occurs when user input is not properly sanitized and is stored on the server, allowing an attacker to inject malicious scripts that will be executed when other users access the affected page. In this case, the Support Agent User can inject malicious scripts into their signature, which will then be executed when viewed by the Administrator. The application protects users against XSS attacks by enforcing a CSP policy, the CSP Policy is: `script-src 'self' 'nonce-abcd' `. The CSP policy only allows the inclusion of JS files that are present on the application server and doesn't allow any inline script or script other than nonce-abcd. The CSP policy was bypassed by uploading a JS file to the server by a POST request to /conversation/upload endpoint. After this, a working XSS payload was crafted by including the uploaded JS file link as the src of the script. This bypassed the CSP policy and XSS attacks became possible. The impact of this vulnerability is severe as it allows an attacker to compromise the FreeScout Application. By exploiting this vulnerability, the attacker can perform various malicious actions such as forcing the Administrator to execute actions without their knowledge or consent. For instance, the attacker can force the Administrator to add a new administrator controlled by the attacker, thereby giving the attacker full control over the application. Alternatively, the attacker can elevate the privileges of a low-privileged user to Administrator, further compromising the security of the application. Attackers can steal sensitive information such as login credentials, session tokens, personal identifiable information (PII), and financial data. The vulnerability can also lead to defacement of the Application. Version 1.8.128 contains a patch for this issue.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2024-29184 since 03/18/2024. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 1.8.128 eliminates this vulnerability.

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Productinfo

Vendor

• freescout-helpdesk

Name

• freescout

Version

• 1.8.127

Website

• Product: https://github.com/freescout-helpdesk/freescout/

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