Download Linux Network Security (Administrator's Advantage Series) by Peter G(Peter G. Smith) Smith PDF
By Peter G(Peter G. Smith) Smith
Deal with. regrettably, in modern setting all networks are strength hacker objectives, from top-secret army study networks to small domestic LANs. most modern Linux documentation focuses extra on ease of use than safety, so Linux community safeguard specializes in securing Linux in a networked surroundings, the place the safety of the total community should be thought of, instead of simply remoted machines. this entire consultant presents a mixture of conception and functional innovations to educate directors tips on how to set up and use safety purposes, in addition to how they paintings and why they're invaluable of their networks. beginning with the necessity for safeguard and realizing the matter, the ebook teaches directors approximately packet filtering (firewalling) with iptables, hardening companies reminiscent of Apache, BIND, Sendmail, FTP, and MySQL to avoid assaults, community research, encryption, neighborhood defense, DoS assaults, and rootkits. Auditing networks for capability vulnerabilities and developing safe passwords also are explored. this is often the single publication that truly information how one can safe a Linux community.
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Extra info for Linux Network Security (Administrator's Advantage Series)
Sample text
On busy mail servers (such as those owned by ISPs), unsolicited junk e-mail (spam) can have a similar effect, due to sheer volume. In a similar vein, any daemon that processes user requests (and that, after all, is the main purpose of a daemon) is susceptible to CPU/RAM-consuming attacks. This could be in the form of repeated requests to Apache, BIND, and so on. The good news is that Linux is fairly resilient to such attacks; they may slow the server down, but they are unlikely to cause it to crash.
ARP spoofing, which we covered in Chapter 2, gives users with less than honorable intentions the ability to divert the flow of traffic, while flooding of the CAM table can cause the switch to fail open, making it behave like a hub, forwarding frames on to every port. This may seem like undesirable behavior, but for the smooth running on the network, it's vital. Choosing switches that don't fail open means that if the CAM table becomes corrupted from nonmalicious causes, traffic flow on the network will grind to a halt.
Similar to the ping of death is the Teardrop, a fragmentation attack using UDP. The attacker creates a series of UDP fragments, each with overlapping offset fields. When the recipient attempts to reassemble these malformed fragments, it causes a kernel panic. 32 kernel patch, to be precise). SYN Flooding One of the most popular DoS attacks is the SYN flood, in which the victim is bombarded with connection requests, ultimately causing legitimate connections to be rejected, while consuming system resources.