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6.Firewall A) Personal firewall Windows XP now integrates a firewall in its standard installation, however it is still strongly recommended to use tried and tested tools. Normally, you don't need a firewall: if you have no active server application on a system, it should be impossible to hack your system from outside. However, that is never the case by default on Windows (services such as netbios, UpnP, ...) What's more, a firewall does not only control entering data, but also outgoing data, which is important when the machine is used as a working station. ZoneAlarm is a firewall popular with the general public, that can control in a simple way entering and outgoing traffic through authorized applications. ZoneAlarm is free and available at http://www.zonelabs.com. The professional version is more complete than the free standard one. Our examples will be with this, the more complex version, which will offer a broader view of of firewall configuration principles on Windows. Its installation presents no difficulty, the steps are clear. Once ZoneAlarm is installed, only two sections of the software present a real interest for anything concerning network filtering rules: – firewall; – program control. "Firewall" Section In the main tab, it is possible to specify predefined tolerance levels concerning three types of “zones”. These zones concern the networks to which the computer is linked. Generally, we will find the “Internet” zone, the “Trusted” zone and the “Blocked” zone. The “Internet” zone is an explicit one, it contains all the Internet remote machines. The “Trusted” zone generally concerns the machines of a local network. Consider as “trusted” machines physically close to yours. Finally, the “Blocked” zone is defined by the administrator, and concerns the machines banned from any form of communication with yours. The Hackademy DMP -198/209- SYSDREAM
There are three protection levels: "High", "Medium" and "Low" : – ‘’High’’ : your machine does not answer any unauthorized request; – ‘’Medium’’ : your machine answers to some requests (such as a ping) ; – ‘’Low’’ : security is deactivated. The Hackademy DMP -199/209- SYSDREAM
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Hack security “pro”
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Authors For their contribution to t
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Chapter IV: Web Vulnerabilities....
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INTRODUCTION TO TCP/IP NETWORKS Net
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In case of reception, each layer wi
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ARP heading: The Hackademy DMP -11/
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Version: 4 bits. The version field
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TCP header: Source Port: 16 bits. T
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TCP/UDP Port Notions: Multiplexing/
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Start the MS-DOS control interface
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CHAPTER I INFORMATION ACQUISITION T
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expires: 2005-10-28 11:28:29 create
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In the answer field you will find:
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nmap -sP 192.168.124.0/24 Starting
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C) Fingerprinting the system The nm
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It is also possible to specify seve
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SMTP : Simple Mail Transfer Protoco
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SNMP : Simple Network Management Pr
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Here is a scan report obtained with
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# nmap 3.50 scan initiated Wed May
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CHAPTER II CLIENT VULNERABILITIES T
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File viruses: These viruses attack
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Retroviruses are a bit more aggress
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However, do check in the start file
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Creating a hidden gateway : But the
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infallible. It consists in associat
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DOS commands if conditional pluggin
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Each one of these zones can be conf
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The javascript code destined to dow
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The wizard will ask you the locatio
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CHAPTER III NETWORKS VULNERABILITIE
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Here, the connection between the ro
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Using the "Follow TCP Stream" optio
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You have just created a new filter.
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This handshake takes place as follo
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Third step Illustration 3: ACK To c
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The methodology of this type of att
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The case of the UDP protocol Unlike
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nc -l -v -n -p 887 Injection of com
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Let's try to connect again from mac
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We can see that Ethereal has seen i
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Conclusion The covert channel princ
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It is the IP protocol that is going
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We will simultaneously launch the p
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5.Connections Hijacking We are goin
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Let us now display the contents of
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B) DNS hijacking The DNS protocol i
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ssh2 protection The server's public
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B) SSL The SSL protocol functions w
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Recent viruses use the resources of
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1.Site Mapping The first thing a ha
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Scan_web.php Scan_web.php is a PHP
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The phpinfo() function gives the ha
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ack to an error message */ if ($ok
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System() Function The System() func
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Uploading via PHP Quite often, one
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inc.php file page1.php file By ty
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There are other functions of the sa
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i=0; j=0; while (data[i] != '=') {
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system("/usr/bin/sendmail -t test@t
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In all cases, it is also important
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It is therefore vital to understand
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The error means that the SQL reques
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} else{ } $query = "UPDATE users SE
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And here is the result: We are now
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We can see that CrashFr is now in b
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Once the client has entered his pse
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CHAPTER V APPLICATION VULNERABILITI
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2.Buffer Overflow Buffer overflow t
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xdream@Laptop:/$ readelf -a /bin/ls
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A few assembler notions Let us see
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Let us study the representation of
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The program segfaulted when trying
Page 147 and 148: We can determine that at address 0x
Page 149 and 150: The we can look in libc6 for the ad
Page 151 and 152: We can also see in the sources a ca
Page 153 and 154: 3. String Format Presentation Strin
Page 155 and 156: So when the '%n' indicator is encou
Page 157 and 158: Using dtors. bash# objdump -s -j .d
Page 159 and 160: Security The only solution here is
Page 161 and 162: This program is “suidroot”, whi
Page 163 and 164: } } printf("Opening of file authori
Page 165 and 166: } flock(fd, LOCK_UN); //Closing of
Page 167 and 168: 1.Authentication Brute force In thi
Page 169 and 170: Hybrid attack T launch a hybrid att
Page 171 and 172: LC3 offers 4 methods. 1. From the l
Page 173 and 174: B) The Unix passwd file On Unix sys
Page 175 and 176: C) Authentication service One of th
Page 177 and 178: The first thing to do is to create
Page 179 and 180: B) Backdoor kernel Backdoor kernels
Page 181 and 182: CHAPTER VII GENERIC SECURITY PROCED
Page 183 and 184: Configure snort so that it can stor
Page 185 and 186: Pmon NT Pmon is a process monitorin
Page 187 and 188: Here is a simple scenario. Let us t
Page 189 and 190: Step 2 : Encoding and signing (PGP)
Page 191 and 192: 12.You can choose a separate Signat
Page 193 and 194: B) Cryptography of hard drives Wind
Page 195 and 196: The first time this operation is do
Page 197: Integrity controller on Linux There
Page 201 and 202: "Program control" Section The “pr
Page 203 and 204: The rules take the following values
Page 205 and 206: 7.VPN What is a Virtual Private Net
Page 207 and 208: Contact 1 Villa du clos de Malevart
Page 209: Created by trainers from The Hackad
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