module

Linux BPF Sign Extension Local Privilege Escalation

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Disclosed
11/12/2017
Created
07/25/2018

Description

Linux kernel prior to 4.14.8 contains a vulnerability in the Berkeley
Packet Filter (BPF) verifier. The `check_alu_op` function performs
incorrect sign extension which allows the verifier to be bypassed,
leading to arbitrary kernel read/write.

The target system must be compiled with BPF support and permit
unprivileged access to BPF with `kernel.unprivileged_bpf_disabled`
not set to 1.

This module has been tested successfully on:

Debian 9.0 kernel 4.9.0-3-amd64;
Deepin 15.5 kernel 4.9.0-deepin13-amd64;
ElementaryOS 0.4.1 kernel 4.8.0-52-generic;
Fedora 24 kernel 4.5.5-300.fc24.x86_64;
Fedora 25 kernel 4.8.6-300.fc25.x86_64;
Fedora 26 kernel 4.11.8-300.fc26.x86_64;
Fedora 27 kernel 4.13.9-300.fc27.x86_64;
Gentoo 2.2 kernel 4.5.2-aufs-r;
Linux Mint 17.3 kernel 4.4.0-89-generic;
Linux Mint 18.0 kernel 4.8.0-58-generic;
Linux Mint 18.3 kernel 4.13.0-16-generic;
Mageia 6 kernel 4.9.35-desktop-1.mga6;
Manjero 16.10 kernel 4.4.28-2-MANJARO;
Solus 3 kernel 4.12.7-11.current;
Ubuntu 14.04.1 kernel 4.4.0-89-generic;
Ubuntu 16.04.2 kernel 4.8.0-45-generic;
Ubuntu 16.04.3 kernel 4.10.0-28-generic;
Ubuntu 17.04 kernel 4.10.0-19-generic;
ZorinOS 12.1 kernel 4.8.0-39-generic.

Authors

Jann Hornbleidlvnikrlarabeeh00diebcoles

Platform

Linux

Architectures

x86, x64

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:

    msf > use exploit/linux/local/bpf_sign_extension_priv_esc
    msf /(c) > show actions
        ...actions...
    msf /(c) > set ACTION < action-name >
    msf /(c) > show options
        ...show and set options...
    msf /(c) > run
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