The Linux Filesystem Unidad 4. Detalles de archivo Capitulo 1.
Present Absence of Linux Filesystem Security
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Transcript of Present Absence of Linux Filesystem Security
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PresentAbsenceofLinuxFilesystemSecurityPhilipDerbeko
January,2018
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AboutMe([email protected])
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PresentAbsence
Acharacterwhodoesnotappearformuchof,ifnotalltheplot,butwhosepresenceisneverthelessfelt.Moreaccurately,theabsenceofthecharacterismostsignificant.
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RecapofFSSecurity
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RecapofFSSecurity
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RecapofFSSecurity
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RecapofFSSecurity
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RecapofFSSecurity
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RecapofFSSecurity
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RecapofFSSecurity
1. Read/Write/Execute2. Inheritance3. Only“Allow”permissions
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RecapofFSSecurity
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RecapofFSSecurity
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Privacyvs.Security
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The“Root”oftheproblem
Permanentlinktothiscomic:https://xkcd.com/149/
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CapabilitiesAnyone?
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CapabilitiesAnyone?
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LSMtotherescue???
Issues:- Notmandatory- Singleactivemodule- Kernelcompilation- LimitedHooks
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3SecurityGaps
1.Contextofoperations2.WeirdOperations3.DestructiveOperations
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Contextofoperations
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Doyoureallyknowwhatisgoingon?
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Doyoureallyknowwhatisgoingon?
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ContextofOperations
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WeirdOperations
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WeirdOperations
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WeirdOperations
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WeirdOperations
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DestructiveOperations
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DestructiveOperations
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DestructiveOperations
KillDisk –encryptionloop
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DestructiveOperations
Encoder–encryptionloop
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DestructiveOperations
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DestructiveOperations– ShieldFS assumptions/findings
1. #offolderlistingoperations2. #ofreadfiles3. #ofwrittenfiles4. #ofrenamedormovedfiles5. #ofaccessedfiles6. Averageentropyoffile-writeoperations
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Solution?
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WeirdOperations