The setuid bit can be set on an executable file so that when run, the program will have the privileges of the owner of the file instead of the real user, if they are different. This is the …

Linux ignores the setuid¹ bit on all interpreted executables (i.e. executables starting with a #! line). The comp.unix.questions FAQ explains the security problems with setuid shell scripts. These …

Jan 26, 2016 · I have a feeling the setuid bit, the nosuid mount option, sudo, and su are all related given their names. But how do they relate to one another? Are some of them used in …

But the octal number 4000 is always associated with setuid (in books etc). I understand (to some good extent) file permissions, the concept of umask, setuid and using octal numbers with chmod.

int main() { setuid(0); system("./program.sh"); #This line is dangerous: It allows an attacker to execute arbitrary code on your machine (even by accident). return 0; } Compile and execute …

Oct 22, 2017 · An unprivileged program can use setuid() to change its effective uid, though. If the program is started as suid non-root, the effective uid and the real uid are different. The …

I created a small script as the root user... #!/bin/bash cat /etc/shadow and set the setuid bit and placed it within the guest folder. When I ran the script as guest, it showed permission denied....

Nov 4, 2020 · On a recent Linux system, ping doesn't need any privileges for its most basic operation, which is to send ICMP echo request messages and receive responding echo reply …

Jan 16, 2018 · There are some protections for setuid programs that are built-in to the operating system: for example, you cannot attach a debugger to a process that is running a setuid root …

Mar 11, 2022 · The setuid and setgid on executable is forcing that executable to be run with permissions of the owner-group of the file. Who should we switch the permissions to if it is 'set …