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Linux BPF Sign Extension Local Privilege Escalation

Linux kernel prior to 4.14.8 utilizes the Berkeley Packet Filter (BPF) which contains a vulnerability where it may improperly perform sign extension. This can be utilized to escalate privileges. The target system must be compiled with BPF support and must not have kernel.unprivileged_bpf_disabled 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 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.

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Module Name

exploit/linux/local/bpf_sign_extension_priv_esc

Authors

  • Jann Horn
  • bleidl
  • vnik
  • rlarabee
  • h00die
  • bcoles <bcoles [at] gmail.com>

References

Targets

  • Auto

Platforms

  • linux

Architectures

  • x86
  • x64

Reliability

Development

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 exploit(bpf_sign_extension_priv_esc) > show targets ...targets... msf exploit(bpf_sign_extension_priv_esc) > set TARGET <target-id> msf exploit(bpf_sign_extension_priv_esc) > show options ...show and set options... msf exploit(bpf_sign_extension_priv_esc) > exploit

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