module

Linux BPF doubleput UAF Privilege Escalation

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Disclosed
2016-05-04
Created
2018-05-30

Description

Linux kernel 4.4 does not properly reference count file descriptors, resulting
in a use-after-free, which can be abused to escalate privileges.

The target system must be compiled with `CONFIG_BPF_SYSCALL`
and must not have `kernel.unprivileged_bpf_disabled` set to 1.

Note, this module will overwrite the first few lines
of `/etc/crontab` with a new cron job. The job will
need to be manually removed.

This module has been tested successfully on Ubuntu 16.04 (x64)
kernel 4.4.0-21-generic (default kernel).

Authors

jannh jannh@google.com
h00die mike@shorebreaksecurity.com

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