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Top Forums UNIX for Dummies Questions & Answers Difference between inbuilt suid programs and user defined root suid programs under bash shell? Post 302955665 by syncmaster on Sunday 20th of September 2015 10:44:21 AM
Old 09-20-2015
Difference between inbuilt suid programs and user defined root suid programs under bash shell?

Hey guys,

Suppose i run passwd via bash shell. It is a suid program, which temporarily runs as root(owner) and modifies the user entries.

However, when i write a C file and give 4755 permission and root ownership to the 'a.out' file , it doesn't run as root in bash shell. I verified this by comparing uid and euid within the program which turned out to be the same. However, in zsh shell, it runs with root privileges

My question is : Why does an inbuilt program like suid is able to run with root privileges in bash shell while a user defined suid root program is not ?
 

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LOGFETCH(1)						      General Commands Manual						       LOGFETCH(1)

NAME
logfetch - Xymon client data collector SYNOPSIS
logfetch CONFIGFILE STATUSFILE DESCRIPTION
logfetch is part of the Xymon client. It is responsible for collecting data from logfiles, and other file-related data, which is then sent to the Xymon server for analysis. logfetch uses a configuration file, which is automatically retrieved from the Xymon server. There is no configuration done locally. The configuration file is usually stored in the $BBHOME/tmp/logfetch.cfg file, but editing this file has no effect since it is re-written with data from the Xymon server each time the client runs. logfetch stores information about what parts of the monitored logfiles have been processed already in the $BBHOME/tmp/logfetch.status file. This file is an internal file used by logfetch, and should not be edited. If deleted, it will be re-created automatically. SECURITY
logfetch needs read access to the logfiles it should monitor. If you configure monitoring of files or directories through the "file:" and "dir:" entries in client-local.cfg(5) then logfetch will require at least read-acces to the directory where the file is located. If you request checksum calculation for a file, then it must be readable by the Xymon client user. Do NOT install logfetch as suid-root. There is no way that logfetch can check whether the configuration file it uses has been tampered with, so installing logfetch with suid-root privileges could allow an attacker to read any file on the system by using a hand-crafted con- figuration file. In fact, logfetch will attempt to remove its own suid-root setup if it detects that it has been installed suid-root. ENVIRONMENT VARIABLES
DU Command used to collect information about the size of directories. By default, this is the command du -k. If the local du-command on the client does not recognize the "-k" option, you should set the DU environment variable in the $BBHOME/etc/hobbitclient.cfg file to a command that does report directory sizes in kilobytes. FILES
$BBHOME/tmp/logfetch.cfg $BBHOME/tmp/logfetch.status SEE ALSO
xymon(7), hobbit-clients.cfg(5) Xymon Version 4.2.3: 4 Feb 2009 LOGFETCH(1)
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