Synopsis
Sophos XG Firewall provides login pages for users at https://[target]/userportal/webpages/myaccount/login.jsp and administrators at https://[target]:4444/webconsole/webpages/login.jsp. These links can insert a value into the "username" login field through the "utype" parameter. For example, the following will pre-populate the "username" field to be albino_lobster:
https://[target]:4444/webconsole/webpages/login.jsp?utype=1albino_lobster
An attacker can also inject JavaScript through this method. The following will create a popup box that says “LOBSTER” when the user mouses over the username field:
https://[target]/userportal/webpages/myaccount/login.jsp?utype=lalbino_lobster%22%20onmouseover=%22alert(%27LOBSTER%27);%22
Note that Google Chrome detects/disables these attacks but Mozilla Firefox does not. Additionally, the Sophos XG Firewall comes with default admin credentials of "admin/admin" that can be used with the admin HTTP interface (port 4444) and SSH, as seen on page 8 of the Sophos XG Firewall Administrator Guide.
Solution
The vendor has released Sophos XG Firewall 16.05 MR1 to address this issue.
Additional References
https://www.sophos.com/en-us/medialibrary/PDFs/documentation/Sophos-XG-Firewall-Administrator-Guide.pdf?la=enhttps://community.sophos.com/products/xg-firewall/b/xg-blog/posts/sfos-16-05-1-mr1-released
Disclosure Timeline
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