[Canonical Whitepaper 2025] A guide to infrastructure hardening: Best practices to improve the security posture of your Linux-based infrastructure deployments

[Turritopsis Dohrnii Teo En Ming]

Dear Ralf Mardorf,

It was from a sponsored Facebook advertisement from Canonical Ltd.

The Facebook advertisement offers free download of Ubuntu Linux servers hardening guide (based on CIS benchmarks) published by Canonical Ltd.

The PDF document download link also looks like Facebook Content Delivery Networks (CDN) server download link.

Don't tell me I have been duped??????

Some cybercrime syndicate is impersonating as Canonical Ltd to place ads on FB?

Regards,

Mr. Turritopsis Dohrnii Teo En Ming
Singapore
12 Dec 2025 Friday 3.56 PM Singapore Time



Sent with Proton Mail secure email.

On Friday, December 12th, 2025 at 3:34 PM, Ralf Mardorf via ubuntu-users <ubuntu-users at lists.ubuntu.com> wrote:

> 
> 
> On Fri, 2025-12-12 at 03:10 +0000, Turritopsis Dohrnii Teo En Ming via ubuntu-users wrote:
> 
> > The hardening guide link is at
> > 
> > https://scontent.fsin4-1.fna.fbcdn.net/m1/v/t0.50684-6/An-QPxv9ZNZZ0c11iGB1pyzPfjxKJTjG8Qz0xNpoXiWxz7mIOHBCV9BZbjzXGXqwrCzW5-zkTwrbdjgZEpsdbV0EOLaxMDQ3sYm0D-WnUVR83NaeyS63c-0QDBKUUA/A+guide+to+infrastructure+hardening+(1).pdf?_nc_oc=AdnUaZXrZzBSawbBa2Fdg6N5_1_pDIQHxwjLwbg58gNZaqKmB7Vi3nsddN8bjL-7Eqo&ccb=10-5&oh=00_AfmDyrFxB28d4GRqI-kzzMydIet7jkJbDzDEFn0DBru9Dg&oe=6962CB92&_nc_sid=de6fe6
> 
> 
> This link inspires trust because it looks like a typical official link
> to a source from Canonical. Thank you for sharing!
> 
> If you don't click on this link, you've already closed the biggest
> security gap.
> 
> ;)
> 
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