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Hello friends Welcome to Anonymous School. In this blog we see about Advanced Privilege Escalation Techniques On Linux Systems .

Advanced Privilege Escalation Techniques on Linux Systems

Privilege escalation is a process of exploiting a vulnerability on a system or application to gain elevated privileges. Privilege escalation can be achieved by exploiting weaknesses in the system or through the use of malicious scripts. It is important for system administrators to be aware of the advanced techniques used to gain elevated privileges on a Linux system.

Exploiting Weak File Permissions

One of the most common techniques used to gain elevated privileges on a Linux system is exploiting weak file permissions. Every file on a Linux system has an associated set of permissions which determine who can access and modify the file. If an attacker is able to get access to a file with weak permissions, they can exploit this to gain access to higher privileged files and resources.

To check the file permissions of a file, use the command:

ls -l /path/to/file

This command will tell you the file's owner, group, and the permissions assigned to each user or group. If any of the user or group permissions are set to something other than “Read” or “Write”, then the file is vulnerable to attack.

Exploiting Setuid Binaries

Another way attackers can gain elevated privileges on a Linux system is through the exploitation of setuid binaries. Setuid binaries are those that are set to run as a different user when executed, typically with root level privileges. By exploiting a setuid binary, an attacker can execute code as a privileged user, thus gaining access to sensitive areas of the system.

To view a list of all the setuid binaries on a system, use the command:

find / -perm -4000 -print 2>/dev/null

This will list all the setuid binaries found on the system. It is then up to the system administrator to assess each one, and to determine whether or not it poses a security risk.

Using Kernel Exploits

The kernel is the core of the Linux operating system, and as such, it is the most privileged part of the system. If an attacker is able to exploit a vulnerability in the kernel, they can gain full control of the system. Kernel exploits are rare, but they can still be used to gain root level privileges on a Linux system.

Conclusion

Advanced privilege escalation techniques can be used to gain access to higher privileged files and resources on a Linux system. System administrators should be aware of these techniques and take steps to prevent them from being used. This can include setting strong file permissions, scanning for setuid binaries, and ensuring that the system kernel is up to date and secure.

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