Fabio Semperboni

​SYNful Knock – backdoor in Cisco devices

Recently, Fireeye researchers have discovered a new type of malware implant in Cisco router that allows attackers to gain and keep access to these devices. The...

Cisco 2015 Midyear Security Report

Like every year, Cisco has released the Midyear Security Report. This paper is written to understand how attackers are evolving their techniques to evade defenses, using stealthy...

Is static port channel a good idea?

During my CCIE R&S studies (CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1), I have discovered an unexpected behavior of the static...

Leap Second 2015: a critical bug in NXOS

In June 30, 2015 at 23:59:60 UTC, one minute will have 61 seconds when a leap second is added; the reason we have to...

Chuck Robbins, the new CEO of Cisco

Cisco today announced that its Board of Directors has appointed Chuck Robbins as Chief Executive Officer effective July 26, 2015. In his previous role as...

Send WhatsApp alert during a network fault

A good network engineer must react quickly during a fault. On the market, there are several solutions to monitor the network malfunctions: HP Openview,...

A Ghost in the device? CVE-2015-0235

On Tuesday January 27, 2015, Qualys security researchers discovered the GHOST vulnerability (CVE-2015-0235), a serious weakness in the Linux glibc library, that allows attackers...

Cisco VSS: Failure scenarios

In the last article, I explained how to configure the Cisco 6500 in VSS configuration, but how does the VSS reacts during a failure? There...

Cisco 2015 Annual Security Report

Like every year, Cisco has released the Annual Security Report that is one of the preeminent security reports that examines the latest threat intelligence, providing...

Cisco 6500 VSS configuration

The Cisco Catalyst 6500 Series Virtual Switching System (VSS) allows the clustering of two chassis together into a single, logical entity. This technology allows...