barcode reader java app download Part XII Detecting Intrusions 379 in Software

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Part XII Detecting Intrusions 379
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There are three basic levels of hacking At the highest level are the hackers capa- Detecting Intrusions ble of discovering security vulnerabilities in software These hackers are often students, academics, or security professionals They are motivated by curiosity, the desire for recognition, or a direct mandate to detect flaws in a system s security Next are the programmers, called crackers, who take a discovered vulnerability and turn it into a practical program known as an exploit ( sploit) The program is capable of attacking a system and gaining access by taking advantage of the vulnerability Sometimes the high-level hackers will create harmless exploits as a proof of concept Usually the exploits created by crackers are more malicious and install backdoors (trojans) on the compromised system At the lowest level you have script kiddies, people most often characterized as teenage pseudo-hackers They simply download exploits made by crackers and launch them against large swaths of the Internet When they find an exposed machine, they leave their Full Disclosure mark, often disabling a Web site or computer network with a Denial of The details of a newly discovered vulService (DoS) attack Real hackers nerability are often released to the the Net s elite, look down upon public through various security discusscript kiddies because they lack real sion lists (the bugtraq list being the skill Script kiddies take shortcuts; most popular) Full disclosure " hapthey use prewritten programs to pens if enough information is given to take advantage of documented loopcreate a workable exploit, or if an exholes in computer systems With this ploit is released as proof of concept approach to hacking, little planning It is considered bad form to fully disis involved and almost no engineerclose details of a vulnerability without ing is required first notifying the software vendor and Worms are exploits that have giving them adequate opportunity to been combined with programs that create and release a patch Most hackautomatically search for new susers will wait one to two weeks, alceptible target machines Many of though some will give more or less these find-and-exploit programs are time, depending on the vendor and the designed to identify a target, gain application access, install a copy of the worm Once the patch is out, the details also software, and use the infected macome out It s never long before a workchine to search for new victims able exploit is released and launched The vast majority of hack atagainst unpatched systems This is why tempts on the Internet come from it s critical to ensure that security worms and other automated propatches are applied as soon as they re grams Script kiddies are constantly released launching new worms, and old worms can take a while to die out As
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380 Network Security Illustrated a result, the Internet is full of digital slimy wigglers that are endlessly scouring the net looking for susceptible computers to exploit The truth is, the average hacker is actually a computer or a teenager who s acting like one The highly skilled human hackers are far more capable, but are generally not interested in pointless hacking These are the hackers of legend, but the odds of one attacking your network are slim
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Is the goal of an intrusion detection system to spot the vast majority of hacking attempts (the computers) or the small number of professional attempts (the hackers) Stopping automated hacking attempts would require an infrastructure similar to a virus scanner A device would filter all incoming/outgoing traffic, matching against known automated hacking signatures The signature database would have to be frequently updated There d be little need for a network administrator s involvement Properly done, a system like this would stop the vast majority of all hacking attempts on the average network What about those hackers Well, security companies have successfully convinced many major corporations that the handfuls of skilled hackers are really the problem They have designed their commercial intrusion detection systems as massive intelligence gathering tools that are capable of tracking many professional hackers through a network (when used correctly) Ultimately, this means having a network administrator who knows how to deal with the high-end tools bundled with an IDS Without the right network administrator talent, the IDS becomes a glorified virus scanning device For most organizations real needs, the current crop of intrusion detection systems are needlessly complex The functionality for the uber-administrator with tons of experience and time should be offered separately from the core, low administration virus scanner-like approach to detecting script kiddie activity In the broader market, intrusion detection systems still maintain their original positioning They are known to be high-level tools that can stop hacker intrusions when used properly But this could all change in the coming years IDSs could formally travel down the road of virus scanning software
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