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Digital forensic in security of information system based on Linux and Windows platforms

dc.contributor.advisorMijajlović, Žarko
dc.contributor.otherMihaljević, Miodrag
dc.contributor.otherLilić, Stevan
dc.contributor.otherOgnjanović, Zoran
dc.contributor.otherVučković, Dejan
dc.contributor.otherPrlja, Dragan
dc.creatorKorać, Vanja
dc.date.accessioned2017-07-27T08:52:50Z
dc.date.available2017-07-27T08:52:50Z
dc.date.issued2014-09-08
dc.identifier.urihttp://eteze.bg.ac.rs/application/showtheses?thesesId=4077
dc.identifier.urihttps://fedorabg.bg.ac.rs/fedora/get/o:13644/bdef:Content/download
dc.identifier.urihttp://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=45873167
dc.identifier.urihttp://nardus.mpn.gov.rs/123456789/6883
dc.identifier.urihttp://dais.sanu.ac.rs/123456789/957
dc.description.abstractDigitalna forenzika je multidisciplinarna nauka koja podrazumeva spoj razlicitih naučnih disciplina (računarske nauke, pravo, kriminologija) sa brojnim izazovima u uslovima masovnog generisanja digitalnih podataka (Big Data), virtuelizacije klijentske i serverske strane (Cloud Computng), neusaglašenosti standardizacionih tela i opšteg nedostatka brojnih standarda i eksperata u svim disciplinama. Kako se digitalna forenzika odnosi na sve digitalne urađaje, uža naučna oblast uklјučuje brojne aplikacije digitalne forenzike, kao što su računarska forenzika, forenzika mobilnih uređaja, forenzika na sistemima savremenih automobila, senzorskih mreža itd. U ovom radu je analizirana i primenjena uža naučna oblast računarske forenzike. Opisana je digitalna forenzika računarskih sistema baziranih na Windows i Linux platformi, sa fokusom na određena mesta u implementiranom sistemu proaktivne digitalne forenzike koja mogu ukazati na forenzički relevantne događaje kritične za bezbednost sistema. Opisane su brojne metodologije, tehnologije i tehnike istrage visokotehnološkog kriminala. Proces prikuplјanja podataka i digitalne forenzičke analize „uživo”, detalјno je razmatran. Izvršena je kratka revizija karakteristika i tipično zahtevanih funkcionalnosti softverskih forenzičkih alata, za inicijalni odgovor i oporavak podataka i particija magnetnih diskova. Opisani su i najvažniji digitalni forenzički kompleti alata i njihove osnovne funkcionalnosti. U radu se ističu i najznačajniji elementi kojima treba posvetiti posebnu pažnju prilikom digitalne forenzičke analize u virtuelnom okruženju. Takođe su objašnjeni i najvažniji segmenti samog virtuelnog okruženja i način na koji oni mogu biti značajni alati, za postupak digitalne forenzičke analize. U poslednjem delu ovog rada, fokus je usmeren na ranjivosti Windows i Linux platformi sa prikazanim načinima zlonamernog proboja sistema. Opisane su opšte ranjivosti i specifične ranjivosti koje se odnose samo na Windows, odnosno samo na Linux platforme. Takođe, navedeni su i najčešći načini zlonamernog iskorišćavanja sistema. Ranjivosti računarskih sistema i mreža mogu se odnositi na programe, hardver, konfiguraciju i lјude. Isklјučujući lјude kao najznačajniji i istovremeno najkritičniji faktor u zaštiti informacija, programske ranjivosti se tipično koriste za online direktne napade, ili napade malicioznim programima. Otkrivanje i otklanjanje ranjivosti sistemskih programa je jedan od glavnih cilјeva digitalne forenzike. Pored skuplјanja forenzički relevantnih digitalnih podataka i izgradnje čvrstih digitalnih dokaza o kompjuterskom incidentu ili kriminalu za potrebe pravosudnog sistema, cilј digitalne forenzičke analize je da se iskorišćene ranjivosti trajno otklone i da se incident/protivpravna aktivnost takve vrste više nikada ne ponovi. U tom smislu je doprinos ovog rada veoma značajan. Praktičan primer ispitivanja ranjivosti servisa na Windows i Linux platformama obuhvatio je 80 operativnih sistema. Od tog broja, 51 se odnosi na Windows operativne sisteme, a 29 na Linux operativne sisteme. Dobijeni rezultati su rezultat dvogodišnjeg istraživanja, jer je ispitivanje sistema vršeno u 2011. i 2013. godini. Kroz skeniranje i prikaz ranjivosti difoltno instaliranih Windows i Linux sistema preventivno se otkrivaju ranjivosti koje potencijalno mogu biti iskorišćene od strane bezbednosnih pretnji (maliciozni programi ili zlonamerni napadači) i time ugroziti računarske sisteme i informacije. Proaktivnim otklanjanjem ovih ranjivosti realizuje se preventivna zaštita. Uspostavlјanjem sistema proaktivne forenzike, obezbeđuje se logovanje forenzički relevantnih događaja, tj. tragova pokušaja napada u realnom vremenu, čime se bitno olakšava forenzička istraga u slučaju incidenta ili protivpravne aktivnosti.sr
dc.description.abstractDigital forensics is a multidisciplinary science which includes different scientific disciplines (computer scineces, law, criminology) with numerous challenges in conditions of digital data mass generating (Big Data), clients and servers virtualisation (Cloud Computng), incompatibility of standardizing bodies and general lack of numerous standards and experts in all of the disciplines. Since digital forensics applies to all of the digital devices, a focused scientific field includes numerous applications of digital forensics, like computer forensics, mobile devices forensics, forensics on modern cars systems, sensor networks etc. The focused scientific field of computer forensics was analyzed and applied in this paper. Digital forensics of computer systems based on Windows and Linux platforms was described, focused on certain points within the implementing system of proactive digital forensics, which can indicate forensically relevant data critical for system's security. Numerous methodologies, technologies and techniques of investigating cyber crime are described. The process of collecting data and "live" digital forensic analyses were considered in detail. A short revision of features was made, as well as of typical demanded functionality of software fonensic tools for an initial answer and recovery of data and partitions of magnetic discs. The most important sets of digital forensic tools and their basic functionalities were also descibed. In the paper, most important elements were listed which need special attention while performing digital forensic analysis in a virtual environment. The most important segments of virtual environment itself were also explained, as well as ways in which they can represent important tools for performing digital forensis analysis. The last chapter of this paper is focused on vulnerabilities of Windows and Linux platforms, with listed ways of malicious system intrusion. General and specific vulnerabilities were described regarding only Windows or only Linux platforms. The most common ways of malicious system abuse were also listed. Computer systems vulnerabilities can be applied on programs, hardware, configuration and staff. Disregarding staff as the most important, but at the same time the most critical factor in protecting information, program vulnerabilities are typically used for online direct attacks or attacks with malicious programs. Detecting and removing vulnerabilities of system programs is one of the digital forensics main goals. Beside collecting forensically relevant digital data and constructing strong digital evidence about computer incident or criminal for the purposes of law, the goal of digital forensic anlysis is to permanently remove abused vulnerabilities and to prevent incidents/illegal actions from repeating. In this sense, this paper is of utmost importance. A practical example of investigating system vulnerabilities on Windows and Linux platforms included 80 operating systems. Out of that, 51 regards Windows operating systems and 29 of them Linux operating systems. The obtained results derive from a two-year research, since system scanning was performed in 2011 and 2013. Through scanning and displaying vulnerabilities of Windows and Linux systems installed by default, vulnerabilities which could potentially be used by security threats (malicious programs or malicious attacks) and potentially endanger computer systems and information, are precautionally removed. By proactive removing of these vulnerabilities, preventive protection is being performed. By establishing the system of proactive forensics, logging of forensically relevant events, i. e. clues for potential attacks within real time are being secured, making it much easier to perform forensic investigation in case of an incident or illegal action.en
dc.formatapplication/pdf
dc.languagesr
dc.publisherУниверзитет у Београду, Студије при универзитету
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/47018/RS//
dc.rightsopenAccessen
dc.sourceУниверзитет у Београдуsr
dc.subjectzaštita sistema, ispitivanje ranjivosti, visokotehnološki kriminal, digitalna forenzika, forenziĉki alati, forenziĉka analiza „uživo"sr
dc.subjectsecurity of systems, vulnerability scanning, cyber crime, digital forensic, forensic tool, live forensicen
dc.titleDigitalna forenzika u funkciji zaštite infomacionog sistema baziranog na Linux i Windows platformamasr
dc.title.alternativeDigital forensic in security of information system based on Linux and Windows platformsen
dc.typedoctoralThesisen
dc.rights.licenseBY
dcterms.abstractМијајловић, Жарко; Огњановић, Зоран; Вучковић, Дејан; Прља, Драган; Михаљевић, Миодраг; Лилић, Стеван; Кораћ, Вања;
dc.type.versionpublishedVersion
dc.identifier.fulltexthttp://dais.sanu.ac.rs/bitstream/handle/123456789/957/Disertacija.pdf


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