The document discusses various hacking techniques such as session hijacking, packet sniffing, DNS cache poisoning, ARP cache poisoning, IP spoofing, denial of service attacks, web application attacks, password cracking, buffer overflows, and rootkits. It provides details on these network attacks, how they can be used to compromise Linux servers, and ways that Linux servers can be secured and optimized against such hacking techniques.

1. Securing and Optimization
of Linux Servers
and
Hacking Techniques

2. Introduction
“The Linux Based
Services that
Mean Business
Securing Internet”
Securing and optimization of Linux Server and Hacking Techniques

3. Network-Level Attacks
 Session Hijacking:
Securing and optimization of Linux Server and Hacking Techniques

4. Network-Level Attacks(Cont…)
 Packet Sniffing:
Packet sniffer is a piece of software that grabs all of the
traffic flowing
 Dsniff –n –i 1
Securing and optimization of Linux Server and Hacking Techniques

5. Gathering and Parsing Packets
 DNS Cache Poisoning
 DNS ID Spoofing
 DNS Hides Poisoning
Securing and optimization of Linux Server and Hacking Techniques

6. Gathering and Parsing Packets (Cont..)
 The ARP Cache poisoning:
Securing and optimization of Linux Server and Hacking Techniques

7. Gathering and Parsing Packets (Cont..)
 IP Address Spoofing Variations
Securing and optimization of Linux Server and Hacking Techniques

8. Denial of Service Attacks
 TCP Connections
Securing and optimization of Linux Server and Hacking Techniques

9. Denial of Service Attacks (Cont…)
Abusing TCP: The Traditional SYN Flood
Securing and optimization of Linux Server and Hacking Techniques

10. Denial of Service Attacks (Cont…)
The Development of Bandwidth Attacks
Securing and optimization of Linux Server and Hacking Techniques

11. Denial of Service Attacks (Cont…)
DOS
Securing and optimization of Linux Server and Hacking Techniques

12. Denial of Service Attacks (Cont…)
DDOS
Securing and optimization of Linux Server and Hacking Techniques

13. Denial of Service Attacks (Cont…)
Distributed Reflection DOS
Securing and optimization of Linux Server and Hacking Techniques

14. Denial of Service Attacks (Cont…)
Packet path diffusion
Securing and optimization of Linux Server and Hacking Techniques

15. Denial of Service Attacks (Cont…)
Diffusing the path
Securing and optimization of Linux Server and Hacking Techniques

16. Web Application Attacks
 Web Spoofing
 SQL Injection: Manipulating Back-end
Databases
 Cross-Site Scripting
Securing and optimization of Linux Server and Hacking Techniques

17. Operating System and Application-Level Attacks
 Password Cracking With L0phtCrack
 Buffer Overflows in Depth
 Examples of remote root exploit through
buffer overflow
 Root Kits
Securing and optimization of Linux Server and Hacking Techniques

18. Operating System and Application-Level Attacks
Buffer Overflows in Depth
 Stuffing more data into a buffer than it can handle
 Overwrites the return address of a function
 Switches the execution flow to the hacker code
Securing and optimization of Linux Server and Hacking Techniques

19. Operating System and Application-Level Attacks
Process Memory Region
Securing and optimization of Linux Server and Hacking Techniques

20. Operating System and Application-Level Attacks
Examples of remote root exploit through buffer overflow
 QPOP 3.0beta AUTH remote root stack overflow
 BIND 8.2 - 8.2.2 remote root exploit
Securing and optimization of Linux Server and Hacking Techniques

21. Operating System and Application-Level Attacks
Root Kits
 Rootkit name are combination from two words, “root
and “kit”
 collection of tools that enable attacker to keep the
root power
Type of Rootkit
 Application rootkit - established at the application
layer.
 Kernel rootkit - establish more deep into kernel
layer.
Securing and optimization of Linux Server and Hacking Techniques

22. Operating System and Application-Level Attacks
Application Rootkit
 Programs replace to hide attacker presence.
Examples ls,ps,top,du,find,ifconfig,lsof
 Network Daemons with backdoor
 Sniffer Program
Kernel Rootkit
 Hiding processes.
 Hiding files
 Hiding the sniffer.
 Hiding the File System
Securing and optimization of Linux Server and Hacking Techniques

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