Reflected File Download

Summary #

Netsparker detected a possible reflected file download which might enable attackers to gain complete control over a website user's machine by virtually downloading a file from a trusted domain.

This is a vulnerability in the browsers that only affects Microsoft Windows systems.

Impact #

An attacker can craft a URL on the target website that can execute commands on the website visitor's computer if the visitor accepts the download.

For a Reflected File Download attack to be successful:

Attacker controlled input needs to be reflected in the response.
Attacker should be able to change the URL of the vulnerable site to an executable file extension resulting a file download on the website user's browser.

Remediation #

Add Content-Disposition header with filename attribute in the HTTP response:
```
Content-Disposition: attachment; filename=f.txt
```

Classifications #

PCI v3.1-6.5.1, PCI v3.2-6.5.1, CAPEC-375, CWE-840, ISO27001-A.14.2.5, WASC-42, OWASP 2013-A1, OWASP 2017-A1