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UNIX s simplicity and power stem from its use of files be they binary executables, text-based configuration files, or devices Everything is a file with associated permissions If the permissions are weak out of the box, or the system administrator changes them, the security of the system can be severely affected The two biggest avenues of abuse related to SUID root files and world-writable files are discussed next Device security (/dev) is not addressed in detail in this text because of space constraints; however, it is equally important to ensure that device permissions are set correctly Attackers who can create devices or read or write to sensitive system resources such as /dev/kmem or to the raw disk will surely attain root access Some interesting proof-of-concept code was developed by Mixter and can be found at http://mixterwarrior2kcom/rawpowrc This code is not for the faint of heart as it has the potential to damage your file system It should only be run on a test system where damaging the file system is not a concern

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Opera 6 does not support the firstChild, lastChild, previousSibling, or nextSibling properties, so the next three examples will not work in Opera 6

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To obtain a reference to the <P> tag that defines paragraph 1, the code snippet that follows can be used

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SUID Files Set user ID (SUID) and set group ID (SGID) root files kill Period! No other file on a UNIX system is subject to more abuse than a SUID root file Almost every attack previously mentioned abused a process that was running with root privileges most were SUID binaries Buffer overflow, race conditions, and symlink attacks would be virtually useless unless the program were SUID root It is unfortunate that most UNIX vendors slap on the SUID bit like it was going out of style Users who don t care about security perpetuate this mentality Many users are too lazy to take a few extra steps to accomplish a given task and would rather have every program run with root privileges To take advantage of this sorry state of security, attackers who gain user access to a system will try to identify SUID and SGID files The attackers will usually begin to find all SUID files and create a list of files that may be useful in gaining root access Let s take a look at the results of a find on a relatively stock Linux system The output results have been truncated for brevity

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[tsunami]# find / -type f -perm -04000 -ls -rwsr-xr-x 1 root root -rwsr-xr-x 1 root root -rwsr-xr-x -rwsr-xr-x -r-sr-sr-x -r-sr-sr-x -r-sr-sr-x -rwsr-xr-x -r-sr-xr-x -rws--x--x 1 1 1 1 1 1 1 2 root root root root root root root root root root root root root root bin root 30520 May 5 29928 Aug 21 29240 770132 13876 15068 14732 42156 15613 464140 Aug Oct Oct Oct Oct Oct Apr Sep 21 11 2 2 2 2 27 10 1998 /usr/bin/at 1998 /usr/bin/chage 1998 1998 1998 1998 1998 1998 1998 1998 /usr/bin/gpasswd /usr/bin/dos /usr/bin/lpq /usr/bin/lpr /usr/bin/lprm /usr/bin/nwsfind /usr/bin/passwd /usr/bin/suidperl

var oPara1 = documentdocumentElementlastChildfirstChild;

Most of the programs listed (for example, chage and passwd) required SUID privileges to run correctly Attackers will focus on those SUID binaries that have been problematic in the past or that have a high propensity for vulnerabilities based on their complexity The dos program would be a great place to start Dos is a program that creates a virtual machine and requires direct access to the system hardware for certain operations Attackers are always looking for SUID programs that look out of the ordinary or that may not have undergone the scrutiny of other SUID programs Let s perform a bit of research on the dos program by consulting the dos HOWTO documentation We are interested in seeing if there are any security vulnerabilities in running dos SUID If so, this may be a potential avenue of attack The dos HOWTO states: Although dosemu drops root privilege wherever possible, it is still safer to not run dosemu as root, especially if you run DPMI programs under dosemu Most normal DOS applications don t need dosemu to run as root, especially if you run dosemu under X Thus you should not allow users to run a suid root copy of dosemu,

The lastChild node of the document element is the <BODY> tag (the firstChild would be the <HEAD>), whose firstChild node is the <P> tag

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U SUID Files Countermeasure attacks is to remove the SUID/SGID bit on as The best prevention against SUID/SGID

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