LineKernel
Last updated
Last updated
Privilege escalation occurs when a computer user exploits system vulnerabilities or misconfigurations to gain access to other user accounts within a computer system. By obtaining access to these accounts, they can access additional files and execute administrative commands.
1. Vertical privilege escalation.
2. Horizontal privilege escalation.
The hostname command will return the hostname of the target machine
To get the Linux Kernel Version Use uname -r
The kernel is the central program within a computer's operating system, holding full control over all aspects of the system. It is the part of the operating system that always remains in memory, enabling communication between hardware and software components. Typically written in a low-level language like C, the kernel is susceptible to binary exploitation techniques, which can be used to uncover vulnerabilities.
If you want to gain privilege escalation you can search for a POC using
ok I will search for the version of kernel-vulnerable
I found CVE-2015-1328
Ubuntu 14.04 - Linux ubuntu 3.13.0-24-generic #46-Ubuntu x86_64
By running sudo -l we can see all the binaries a user can do. we first run sudo -l
To get a password Frank uses sudo less /etc/shadow
Privilege Escalation: SUID
We run the command
If the binary can lead to a privilege escalation
i searched i google to find the privisc using base64
unshasow
Remember
If the permission of a binary can lead to a privilege escalation
We search for this flaw using getcap.
i searched i google to find the privisc using capabilities
crontab
Cron => used to create job scheduling in Linux
first, check for crontab config
check all files u found check any think
We first check /karen/backup.sh
We first modify /Karen/backup.sh since we have permission
find the files writeable
Network File Sharing (NFS) is a protocol allowing you to share directories and files with other Linux clients over a network
Read the _ /etc/exports _ file, if you find some directory that is configured as no_root_squash, then you can access it from as a client and write inside that directory as if you were the local root of the machine.
Mounting that directory in a client machine, and as root copying inside the mounted folder our come compiled payload that will abuse the SUID permission, give to it SUID rights, and execute from the victim machine that binary (you can find here some C SUID payloads).
Find the SUID
sudo Find
