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... RedHat Package Manager (RPM) packages are already installed (you may need to update them later in this section). To check if an RPM is installed, enter rpm -qa | grep rpm_name .To install an RPM, ... time and trouble by acquiringFreeS/WAN through one of these alternate sources.Some available script sets are designed to allow you to manage ﬁrewallsthat also serve as FreeS/WAN IPSec gateways.You ... with S/WAN and VPNs in general.Currently, almost all ﬁrewalls and security software available todayoffers IPSec support. It is the goal of S/WAN developers for all S/WANimplementations to interoperate,...

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... to Open Source Security ™1 YEAR UPGRADEBUYER PROTECTION PLAN Linux: A Guide to Open Source Security The Only Way to Stop a Hacker Is to Think Like OneJames StangerPatrick T. Lane138 _linux_ FM ... One-way encryp-tion is also used to read a ﬁle and then create a hash of that ﬁle.Theresulting hash value is said to be mathematically unrecoverable.You should understand that in regard to networking, ... working as the NetworkAdministrator and Manager of a top-level Armenian domain. He has alsoworked for the United Nations, the Ministry of Defense of the Republicof Armenia, and Armenian national...

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... Bastille is written specifically to Red Hat Linux and Mandrake Linux. The specific Red Hat/Mandrake content has beengeneralized, and hard-code filenames are now represented as variables.These variables ... down-load and install the security upgrades to avoid denial-of-service (DoS)and intrusion attacks that can result from these weaknesses. For example, a security update can be downloaded for a vulnerability ... file, an e-mail is automatically sent to the administrator, indicatingthat an unauthorized user is accessing the system.Once a user logs in to sudo, a ticket is issued that is valid by default...

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... data? A: As you have learned, packet sniffing is a powerful tool. It allows malicioushackers to capture packets that contain passwords and usernames.The onlyway to protect yourself against hackers ... directories, and databases.; An IDS can act as a supplement to a firewall, because it can help youmonitor traffic on the internal network. Sometimes it may be useful to place an IDS application ... when a file or directory has been altered. It scans your system’s hard drive andcreates a database. After its database has been created,Tripwire can con-duct regular scans of your hard drive and...

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... rules database One of the common moves by a hacker is to alter the rules database in subtle ways that make it easier for thehacker to gain access to the network. Check your rules and comparethem ... problems, because it will require you to ensure that this daemon is not sub-ject to bugs that can cause a security problem. Any daemon, such as Cron, thatacts automatically can cause problems ... can usecron to have Fwlogwatch automatically create HTML reports and place them inyour Apache Server home directory (or any other properly aliased directory).Exercise: Generating an HTML-Based...

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... packets.This way, a ﬁre-wall will not be able to capture and log the packets as easily.■-S Address Allows you to specify the originating address of the scan.Originally meant to allow Nmap to work ... assumesthat you have already downloaded and registered AntiVir.1. Create a directory named antivir.2. Obtain the ﬁle named avlxsrv.tgz from the CD that accompanies thisbook and place it in the antivir ... and HP OpenView allow you to create a graphical map of the net-work, and then manage any host on that map. Although Cheops is not nearly assophisticated, it still allows you to quickly learn which...

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... creates its database, it is said to enter databaseinitialization mode.5. You can then set Tripwire to rescan these files and compare their signa-tures to the signatures stored in the database.This ... generally extends your logging capability by placing additional information into a log file or into a database. Alerting An IDS often has the ability to send alert messages to the network administrator ... the database on a different device than the hard drive is a good idea.The first thing a reasonably talented hacker will do afterobtaining root is find and erase the database. In the past, many...

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... and /var/kerberos/krb5kdc/kdc.acl files to reflect your Kerberosrealm and DNS domain names.You must then add an administrative user, as wellas additional principals, to the database.Using kadmin.localBecause ... a Kerberos administrator uses the kadmin pro-gram to add a principal to the database. Note that the ticket does not actuallycontain the password. It is only signed by a password, which creates ... their packet sniffing on one server orclient interface, or try to hack into a server that contains the sensitiveinformation they seek. For example, they may attempt to hack into a bank’s database...

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... Ipchains and Iptables also allow you to configure your Linux router to masquerade traffic (i.e., to rewrite IP headers so that a packet appears to originate from a certain host), and/or to examine ... owndynamic database. If this database senses a number of ports that havebeen scanned in a row, the firewall can take action. Some actions thefirewall can take may include automatic firewall reconfiguration ... Firestarter138 _linux_ 09 6/20/01 9:49 AM Page 494Implementing a Firewall with Ipchains and Iptables • Chapter 9 4 87 already set, whereas the other actually sets the values .To create a rule thatmatches a ToS...

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... that allApplication layer data is encrypted. No passwords, usernames, or usable datawww.syngress.comChapter 7 Continued138 _linux_ AppB 6/20/01 9:55 AM Page 624 Hack Proofing Linux Fast Track ... database. Determine if any unauthorized changes have beenmade to your database. Use the diff command to compare the two files to see if any changes have occurred.You may also use md5 to generate ... you to configure your Linux router to mas-querade traffic (i.e., to rewrite IP headers so that a packet appears to originatefrom a certain host), and/or to examine and block traffic.The practice...

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