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Tema: Administracija mreža

Mreža otporna na metke (sigurnosna master čeklista za mrežnog administratora)

Objavio: Predrag Marković 88 Komentara


Pročitao sam zvaničan podatak da oko 1.596.270.108 ljudi na svetu koristi Internet.

Sa više od milijardu i po ljudi koji koriste Internet, možete biti sigurni da već postoji nebrojeno mogućnosti za ugrožavanje Vaše privatnosti ili bezbednosti Vašeg preduzeća. Napadači više ne moraju da budu posebno pametni, vešti ili strpljivi. Nisu im potrebne posebne veštine.

Zašto? Softveri za napad su sve napredniji, a informacija o tome kako napraviti štetu ima na tone. (O ovome ću detaljnije u drugom postu.)

Zato, da biste se izborili sa izazovima obezbeđivanja računarske mreže korisno je da usvojite dobra pravila i procese. Kao mrežni administrator, jednom kada ih usvojite, ostalo će biti dosta lakše.

Evo sedam pouzdanih principa koje sam davno prihvatio i za koje znam da koriste mnogi profesionalni mrežni administratori:

1. Bezbednost i složenost su često obrnuto proporcionalne.

Svaki korak koji preduzmete, bilo da je to procena propusta i rizika, bezbednosna politika i razvoj procedure, raspoređivanje mehanizama ili edukacija korisnika, treba da bude jasan i što jednostavniji.

Što su instrukcije i procedure više šifrirane, to je mogućnost za stvaranje nesporazuma i zloupotrebu veća.

2. Bezbednost i upotrebljivost su često obrnuto proporcionalne.

Ne postoji ‘potpuna bezbednost’ kod sistema u upotrebi. Samim tim, važno je koncentrisati se na smanjenje rizika, ali ne trošiti uzalud resurse pokušavajući da ih uklonite u potpunosti. Tako pragmatičan način razmišljanja omogućava Vam veliku šansu da stvorite veoma dobru bezbednost, a u isto vreme i produktivnost.

3. Dobra bezbednost sada bolja je nego savršena nikada.

To je posledica prethodnog aksioma, pošto savršena bezbednost ne postoji u sistemu u upotrebi. Čak i kada bi bila moguća, sistem u upotrebi je pokretna meta: pretnje se menjaju, tehnologije se menjaju i poslovima je neophodna promena. Posao nikada nije gotov, promene su stalno prisutne.

Ovo znanje bi zapravo trebalo da Vas ohrabri da Vam cilj bude 'dovoljno dobro'. Smislite 10 stvari koje treba da uradite, ali uradite samo 4 sada i verovatno ćete biti u boljoj poziciji nego da ste čekali da svih 10 bude moguće uraditi. Ključno je da naučite da odredite prioritete.

4. Lažan osećaj sigurnosti je gori nego pravi osećaj nesigurnosti.

Znati gde je Vaše preduzeće još uvek nesigurno je već okvir koji vam služi da idete dalje. Jako je važno da znate gde ste napravili propust, koji dokumenti i procedure nisu baš ispravni i koje mehanizme treba zameniti.

Lažni osećaj sigurnosti ne motiviše napredak – čak ni analizu- bezbednosti Vaše firme. On vodi ka lažnom samozadovoljstvu, što može dovesti to katastrofe koja je često propraćena komentarom : "Mislio sam da smo to odradili!". Bolje je da znate koje su vam slabosti i da izbegnete nebrojene rizike.

5. Vaša bezbednost je jaka kao Vaša najslabija karika.

Budite temeljni u ispitivanjima i ocenjivanjima.

Na primer, ako postoji razlog da se koriste VPN-ovi (virtualne privatne mreže) kako bi se veza od kuće i udaljenih filijala sa glavnim štabom održala privatnom, može biti neophodno da se podaci zaštite dok su na računarima Vaše mobilne radne snage. To može da se uradi tako što ćete ukloniti modeme iz desktop računara i zahtevati da sav promet ide putem zaštitnog zida.

6. Najbolje je koncentrisati se na poznate, moguće pretnje.

Postoje zamišljene pretnje, stvarne pretnje i moguće pretnje. Takođe, postoje poznate i nepoznate pretnje. Nas najviše zanimaju stvarne i moguće pretnje, dok proširujemo listu poznatih pretnji.

7. Bezbednost je investicija, ne trošak.

Izazov za Vas je da pomognete višim menadžerima da ovo shvate. Ulaganje u mere bezbednosti računarske mreže koje su u skladu sa poslovnim zahtevima i rizicima čini mogućim da se ispune zahtevi za promenama u poslu bez narušavanja održivosti posla.

Dobro obezbeđeni serveri dopuštaju korporativnim informacijama da budu razmenjivane među prodavcima i među poslovnim partnerima. Loše konfigurisani sistemi vode gubitku podataka ili nečemu još gorem.

Mada je utešno kada se neki napad suzbije, mnogo je bolje da nikada i ne testirate Vaše bezbednosne mere na 'bojnom polju'. Slično kao i sa vazdušnim jastukom u automobilu, važno je da su tu, ali bolje je da nikada ne morate da ih upotrebite.

Kada imate na umu ova osnovna pravila, vreme je da odradite ono što je najvažnije u obezbeđivanju računarske mreže: upravljanje bezbednošću. Trebalo bi da Vam gore pomenuti aksiomi olakšaju i unaprede ovaj proces.
Objavljeno: 2. Septembar 2009.      » Prosledite prijatelju

Komentari za Mreža otporna na metke (sigurnosna master čeklista za mrežnog administratora)

Zeljko
30. Oktobar 2009.
2:37 pm
Dobar dan! Recite mi molim Vas, pitanje mozda nije vezano sa temom, za pocetnika u IT oblasti, koji je posao lakse nauciti, koliko su placeni i koji je trazeniji od strane poslodavaca. Hvala.
Predrag Marković
6. Novembar 2009.
7:37 am
@Zeljko: Odličnih poslova ima u praktično svakoj IT oblasti, ako ste visoko stručni, ako razumete poslovne procese i ako znate da se predstavite.
Jaroslav
28. Maj 2010.
10:52 am
Vrlo dobar tekst. Ubediti rukovodstvo "Sedmom principu" je vrlo cesto veci izazov od same procene rizika... Pozdrav.
Renato
30. Maj 2011.
1:39 pm
@Jaroslave tu si u pravu. Ja bih u ovom slučaju preporučio da se prvo napravi dobra priprema kako bi se rukovodstvu prezentovali sigurnosni propusti, a potom tražila sredstva za obezbjeđenje kvalitetne sigurnosti. Recimo da kao vanjski saradnik pokušavate nekoj firmi da prodate svoje znanje iz sigurnosti. Prvo i osnovno pitanje koje ćete dobiti od rukovodeće administracije firme jeste koliko to košta. Vaš cilj bi trebao biti da ih sa prethodnom pripremom ubjedite da nije to pitanje koje trebaju da postave. U današnjim kompanijama, sigurnosti i zaštiti podataka se često pridaje minorna pažnja, jer su riješenja zaštite relativno skupa i ako je zaštita efikasna efekti nisu vidljivi ljudima koji rade u administraciji. Najčešći sigurnosni propusti su vezani za multifunkcijske uređaje, savremene kopir aparate i slično. Često se desi da neko pošalje neki dokument na printanje a po njega ode nakon pola sata. Zbog toga se često dešava da kolega koji ode po svoj print, zatekne vaša dokumenta ispod svojih, pa tako može da ih odnese sa svojim, odnosno ukoliko primjeti da u printu ima dokumenata koji nisu njegovi u najboljem slučaju će ih ostaviti pored uređaja, dok je čest slučaj da takvi dokumenti na kraju završe u kanti za smeće. Takođe ova tipa uređaja u većini slučajeva sadrži i tvrde diskove na koje se zapisuju svi podaci o isprintanim dokumentima. Ostavljanje defaultnog administratorskog passworda na uređaju omogućava bilo kojoj osobi koja ima priključak na mrežu u toj kompaniji da dođe do bilo kojih ranije isprintanih dokumanta. Čest slučaj je takođe, da nakon višegodišnjeg izrabljivanja pomenutih uređaja i nabavkom novijih, isti se prodaju, licitiraju ili poklanjaju, a da se prethodno ne vrši brisanje sadržaja na tvrdom disku ili se ne vrši njegovo uklanjanje. Samim tim vi ste prodali ili poklonili podatke koje ste godinama printali na tom uređaju. E sad zamislite da se radi o kompaniji koja radi sa mušterijama od koje uzima njihove podatke poput brojeva ličnih karata, kopije istih, ili da je u pitanju bankarski sektor, gdje se dnevno vrši gomila printanja dokumenata koje sadrže imena i prezimena klijenata, njihove brojeve računa, imovinsko stanje i slično. Dolazak u posjed tih podataka od strane malicioznih osoba, može da prouzrokuje milionske gubitke takvoj kompaniji. Dakle ukoliko vidite da je nekoj kompaniji potreban savjet ili želite da im prodate svoje znanje, proizvod i riješenja iz oblasti sigurnosti i uštede, a istovremeno imate ograničeni pristup u istu, savjetujem vam da prethodno prekopate korpe za otpatke u blizini multifunkcijski kopir-print uređaja. Da vrijedno skupljate svaki papir koji nađete u njihovoj blizini. Sjedite za jedan računar u kompaniji uz izgovor da morate da provjerite vašu poštu i provjerite da li je promijenjena defaultna administratorska postavka na takvim uređajima, a ako ista nije iskoristite to da pokupite dio print jobova. Nakon nekoliko dana uradite promjenu administratorskog passworda i isti zapišite sebi negdje. Sa tako prikupljenim informacijama obratite se rukovodstvu i prezentujte im informacije do kojih ste došli kao ograničeni korisnik u mreži, naglasite da ste imali potpuni pristup print jobovima, a kada im administrator pokuša zaštiti uređaj, vidjeće da nema administratorskog pristupa, dajte im administratorski password. Prezentujte količinu papira koju ste skupili za određeni period i dajte im grubu računicu koliko se papira baci i koliko se tonera potroši zbog duplih printanja i bacanja već isprintanih dokumenata. Ako ste malo stručniji, možete im napraviti i kalkulaciju za utrošak električne energije, uzimajući u obzir prosječan broj bačenih dokumenata, pomnožen sa brojem dana, te snagom uređaja. Na kraju kao šlag, ukoliko ste došli do nečijih ličnih podataka prezentujte im to uz napomenu kakvu štetu po kompaniju može nanijeti nedobronamjerna osoba, što u novcu što u renomeu kompanije. Nakon ovakve prezentacije, rukovodstvo sigurno neće pitati koliko košta vaše riješenje za zaštitu. Ovakav princip rada normalno možete primjeniti samo ukoliko imate fizički pristup nekoj od prostorija i jednom uređaju na njihovoj mreži, s tim da bi trebalo prethodno u "naivnom" razgovoru sa nekim od rukovodećih kadrova naglasiti da bi ste željeli malo pogledati okolo kako bi ste se uvjerili u pouzdanost njihovog sistema. Nadam se da će ovo pomoći nekome da ubjedi birokrate kako ulaganje u zaštitu nije trošak, nego isplativa investicija. Pozdrav iz Mostara
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