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Title: PowerPoint Presentation Author: hchen Last modified by: Administrator Created Date: 5/11/2001 6:43:58 PM Document presentation format: On-screen Show
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The system uses the UID and GID as 16 bit numbers internally, and resolves ... UID, PID, GID, (i.e. user, process and group identities) run status and command ...
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setuid Demystified-- Examining the API of Security Operation in OS using Formal Models Hao Chen, David Wagner UC Berkeley Drew Dean SRI International
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Setuid Demystified (and how it may relate to stored procedure ... buildmodel() corrects models OS behaviour. Assertion: |U| = 6 is sufficient. Example use ...
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at every instant in time, each process runs in some protection domain ... protection domain in Unix is switched when running a program with SETUID/SETGID ...
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... buffer overflow A setuid program spawns a shell with certain arguments A network packet has lots ... analysis of source code ... network traffic ...
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setuid() Chen, Wagner, Dean, 2002. What Can Be Done? StackGuard ... Static analysis Wagner, 2000. Verify all buffers promising idea. Too many false alarms ...
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Title: CS 380S - Theory and Practice of Secure Systems Subject: UNIX security: setuid and chroot. Static security analysis with MOPS. Author: Vitaly Shmatikov
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Switchboard ... Implementation: The PrivSep Switchboard. root-owned setuid binary ... Like the Switchboard, only accepts commands from the condor user account ...
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from set user ID bit on the file being ... Setid bits on executable Unix file ... If setuid (setgid) bit is on change the EUID of the process changed to ...
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Setuid programs. Password guessing/cracking. Mis-configured file/dir permissions ... Network hacking. Vulnerabilities. TTY access 5 to choose from. SNMP V2 ...
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These programs will be installed with setuid root ... buffer as its parameter all you have to do is craft that buffer appropriately. ... Crafting the exploit string ...
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... SetUID Bit ls -l /etc/passwd /usr/bin/passwd -rw-r--r-- 1 root root 1335 2005 /etc/passwd -rwsr-xr-x 1 root root 25464 2005 /usr/bin/passwd SetGID Bit ls ...
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Buffer Overflow Attacks 'Execution of Arbitrary Code' Aparna Bajaj. Amul Shah ... rwxr-xr-x 1 root root 466944 Mar 11 1994 /usr/local/etc/ftpd. SetUID ...
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... it uses the Grid Resource Identity Mapper (GRIM) to acquire a set of credentials. GRIM is a setuid program that accesses the local host credentials and from them ...
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Title: No Slide Title Author: Marilyn Turnamian Last modified by: cherry Chen Created Date: 8/24/1999 3:43:02 PM Document presentation format:
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Title: Games and the Impossibility of Realizable Ideal Functionality Author: Ante Derek Last modified by: John Mitchell Created Date: 9/7/1997 8:51:32 PM
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Exploiting Software: How To Break Code Seminario originariamente preparato da Nicola Bonelli Angelo Dell'Aera
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What we will cover Protection and Security in OS 1-*
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PowerPoint Presentation ... Security
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Crack Tries to guess passwords by using dictionary words, encrypting them, and comparing with the encrypted password * * Title: Simulations and Analysis
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Operating Systems CMPSCI 377 Lecture 22: Protection & Security Emery Berger University of Massachusetts, Amherst
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Send email, which tells to change the password, to all users. Shell escape (1) ... sprintf(cmd,'/usr/bin/finger %s',argv[1]); system(cmd) ...
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3 (1) UNIX/Linux 1) 2) ...
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Many Unix administrative functions are in programs external to the kernel, able ... Redhead 5.2: URL: ftp://ftp.redhat.com/linux/redhat-5.2/updates/ SuSE 6.0: ...
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Virtual Memory, File-System Interface
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Giga Ethernet. dummynet.irisa.fr. Fast Ethernet. Only one router... for. 32 64 64=160 nodes ... It works :-) Huge side-effect. Is it still necessary with grid ...
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Superuser (uid 0) always has all rights (independent of ACL) ... if uid already in acl list update. if permissions == 0 erase rights for uid ...
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User submits his jobs to a resource through a cloud' of intermediaries ... Late binding of work load using pilot jobs' ... is indeed an authorized pilot runner ...
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var/log/wtmp contains a record of users' logins and logouts, entries that ... var/log/lastlog it records only the time of last login for each user. ...
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Protection problem - ensure that each object is accessed correctly and only by ... Hydra. Fixed set of access rights known to and interpreted by the system. ...
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Controlling Processes
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Outline Designing and Writing Secure Code General principles for architects/managers Example: sendmail vs qmail (optional in backup s) Buffer Overflow Attacks
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Unix Basics Lecture 14 UNIX Introduction The UNIX operating system is made up of three parts; the kernel, the shell and the programs. The kernel of UNIX is the hub of ...
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Implementation of Access Matrix. Revocation of Access Rights. Capability-Based Systems ... Hydra. Fixed set of access rights known to and interpreted by the system. ...
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Shiva Advances in ELF Binary Encryption Shaun Clowes (shaun@securereality.com.au) Neel Mehta (nmehta@iss.net) The Encryptor s Dilemma: To be able to execute, a ...
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CRAMM used in the UK. The simplest can often be overlooked ... Public domain software. Bugs. Accounting. Monitoring. Clock drift! Restricted accounts ...
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Operating system consists of a collection of objects, hardware or software ... control Di can modify Dj access rights. transfer switch from domain Di to Dj ...
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GT4 GridFTP for Admins: The New GridFTP Server William (Bill) Allcock Argonne National Laboratory 04-05 April, 2005 Outline Quick Class Survey Basic Definitions ...
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Operating Systems CMPSCI 377 Lecture 22: Protection & Security Emery Berger University of Massachusetts, Amherst Security Secure if either: Cost of attacking system ...
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Advanced File Permissions. ICE System. Consultant Group 2nd. 5? 17?. 6 ... g[roup]:gid:perms. A specific user. u[ser]:uid:permis. Max permission users & groups ...
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TEL2813/IS2820 Security Management Systems/Evaluations Lecture 11 April 7, 2005 Access control matrix Two implementation concepts Access control list (ACL) Store ...
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Secure Programming, Continued CS 236 On-Line MS Program Networks and Systems Security Peter Reiher
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DERBI: Diagnosis, Explanation and Recovery from Break-Ins Mabry Tyson Douglas Moran Pauline Berry David Blei Artificial Intelligence Center SRI International
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Assignment 1 due this Wednesday (Jan. 13th) ... C idiom of allocating a small buffer to get user or parameter input is so common ...
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Processes should be able to switch from one domain to another ... ACL can be long and time consuming to search ... Check out: man setfacl and man acl. 16 ...
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Issues in the Verification of Systems Tao Song, Jim Alves-Foss, Karl Levitt Computer Security Lab Computer Science Department University of California, Davis
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... of lesser importance with funny names. daemon - owns unprivileged ... sys - owner of kernel and memory images. nobody - owner of nothing, nada, zippo, zilch ...
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Title: Adventures in Computer Security Author: John C Mitchell Last modified by: John C Mitchell Created Date: 9/7/1997 8:51:32 PM Document presentation format
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A domain is a set of objects and access rights in which a process operates. ... Then must search list of pointers in order to revoke; the method is not selective. ...
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MOPS (MOdel checking Programs for Security properties) ... MOPS is not complete but strives to eliminate as many error traces as possible. Questions? ...
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Developed in the late 1970s. A multi-user environment. Intended to be used only by a small number of people ... UNIX Commands Western Michigan University ...
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( This chapter is very Unix specific) ... Means no user should have administrator privileges by default. ... for files on linux. Linux provides two additional ...
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A subject should be given only those privileges necessary to complete its task ... sysctl kern.securelevel=1. Write access to the raw disk partitions is prohibited. ...
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Red Flag Software Co.,Ltd. MIRACLE LINUX Corporation
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