Registered since September 28th, 2017
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Tag selected: privilege.
Saved by uncleflo on January 4th, 2019.
If a user wants to execute a command, he has to first log in into a system. But some users in the system have /bin/false or /sbin/nologin set as a default shell in the /etc/password file. If I change /bin/bash to /bin/false in case of my user, I won't be able to log in into the system, so I also won't be able to run commands. But the shellless users do it anyway: How can a user without a shell execute a command? In POSIX, every running process has three User IDs (UIDs) associated with it; the real UID, which identifies the user who launched the process, the effective UID, which is used to determine what resources the process can access, and the saved Set-User-ID (SUID), which is the effective UID the process had when it started (at the point of the last exec() call). Of these, the effective UID is the most significant, since it is the one used when determining access control decisions regarding the process.
Saved by uncleflo on June 30th, 2017.
The Certified Ethical Hacker course through CyberSecurity Academy will help you to stop hackers by learning to think like one. This class immerses students in an interactive environment where they will scan, test, hack, and secure their own systems. CEH candidates will learn how intruders escalate privileges and what steps can be taken to secure a system. Also covered will be Intrusion Detection, Policy Creation, Social Engineering, DDoS Attacks, Buffer Overflows and Virus Creation. All students will leave the class with a detailed plan on conducting vulnerability assessments and penetration tests.
Saved by uncleflo on June 10th, 2014.
Thanks to ‘JDF’ for taking the time to post a comment – and for asking about the elite European Schools for the sons and daughters of eurocrats, which I mentioned in the previous post about the luxurious lives of the European Commission staff. This will fill you in a bit:
Saved by uncleflo on June 20th, 2013.
How to add a user to the sudoers list? Beleive it or not, this is a fairly common question and in all reality the answer is quite simple. Adding a user to the sudoers list on a fully installed Linux system such as Debian is only possible via the command visudo.
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