Security Leftovers
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How the Linux kernel balances the risks of public bug disclosure
Last month a serious Linux Wi-Fi flaw (CVE-2019-17666) was uncovered that could have enabled an attacker to take over a Linux device using its Wi-Fi interface. At the time it was disclosed Naked Security decided to wait until a patch was available before writing about it.
Well, it’s been patched, but the journey from discovery to patch provides some insights into how the Linux open-source project (the world’s largest collaborative software development effort) manages bug fixes and the risks of disclosure.
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New NextCry Ransomware Encrypts Data on NextCloud Linux Servers
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Using Nmap For Port Scanning + Other Tools to Use
Nmap is a well-known utility that is bundled with many Linux distributions and that is also available for Windows and several other platforms. Essentially a scanning and mapping tool, there’s a lot that Nmap can do for you.
Today, we’re having a look as using Nmap for port scanning which, incidentally, is the tool’s primary usage. Port scanning is an essential task of network management as it ensures that no backdoors are left unaddressed. It is one of the most basic forms of securing the network.
Before we get into the how-to part of this post, we’ll sidetrack a little and first introduce Nmap and its GUI cousin Zenmap. We’ll then explain what ports are and how you need to be careful not to leave unused ports open on your devices. Then, we’ll get to the essence of this post and show you how to use Nmap for port scanning. And since there are quite a few other tools that can be viable alternatives to Nmap for port scanning—some of them much better or easier to use tools—we’ll finally review some of the very best Nmap alternatives for port scanning.
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