Description
Linux kernel 4.4 < 4.5.5 extended Berkeley Packet Filter (eBPF) 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).
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_escmsf undefined(priv_esc) > show actions ...actions...msf undefined(priv_esc) > set ACTION < action-name >msf undefined(priv_esc) > show options ...show and set options...msf undefined(priv_esc) > runPrioritise with Active Threat Intelligence
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