usd-2020-0035 | Gambio GX 4.0.0.0

Advisory ID: usd-2020-0035
CVE Number: CVE-2020-10985
Affected Product: Gambio GX
Affected Version: 4.0.0.0
Vulnerability Type: Stored Cross-Site Scripting (XSS)
Security Risk: Medium
Vendor URL: https://www.gambio.de/
Vendor Status: Fixed in 4.0.1.0 (according to vendor)

Description

The open source web application „Gambio GX“ is contains a XSS vulnerability. In the admin area multiple arguments that are passed while creating a new coupon code are vulnerable to XSS.

Stored cross-site scripting arises when an application receives data from an untrusted source and includes that data within its later HTTP responses in an unsafe way. The transferred inputs are not filtered or encoded before saving or during output.

Proof of Concept (PoC)

The following request can be send to the web application to create a new coupon. Multiple arguments in the request are vulnerable to XSS. For test purposes the XSS payloads were inserted into to the coupon_name and coupon_desc POST parameters.

Fix

It is possible to filter received user input as strictly as possible based on what is expected or valid input. Another option is to encode user-controllable data in HTTP responses, encode the output to prevent it from being interpreted as active content. Depending on the output context, this might require applying combinations of HTML, URL, JavaScript, and CSS encoding.

References

Timeline

Credits

This security vulnerability was found by Gerbert Roitburd of usd AG.

ABOUT usd SECURITY ADVISORIES

In order to protect businesses against hackers and criminals, we always have to keep our skills and knowledge up to date. Thus, security research is just as important for our work as is building up a security community to promote the exchange of knowledge. After all, more security can only be achieved if many individuals take on the task.

Our CST Academy and our usd HeroLab are essential parts of our security mission. We share the knowledge we gain in our practical work and our research through training courses and publications. In this context, the usd HeroLab publishes a series of papers on new vulnerabilities and current security issues.

Always for the sake of our mission: „more security.“

to usd AG


In accordance with usd AG’s Responsible Disclosure Policy, all vendors have been notified of the existence of these vulnerabilities.

Disclaimer

The information provided in this security advisory is provided „as is“ and without warranty of any kind. Details of this security advisory may be updated in order to provide as accurate information as possible.