Description
This module exploits a vulnerability in Linux kernels 4.15.0 to 4.18.18, and 4.19.0 to 4.19.1, where broken uid/gid mappings between nested user namespaces and kernel uid/gid mappings allow elevation to root (CVE-2018-18955).
The target system must have unprivileged user namespaces enabled and the newuidmap and newgidmap helpers installed (from uidmap package).
This module has been tested successfully on:
Fedora Workstation 28 kernel 4.16.3-301.fc28.x86_64; Kubuntu 18.04 LTS kernel 4.15.0-20-generic (x86_64); Linux Mint 19 kernel 4.15.0-20-generic (x86_64); Ubuntu Linux 18.04.1 LTS kernel 4.15.0-20-generic (x86_64).
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/nested/namespace_idmap_limit_priv_escmsf undefined(namespace_idmap_limit_priv_esc) > show actions ...actions...msf undefined(namespace_idmap_limit_priv_esc) > set ACTION < action-name >msf undefined(namespace_idmap_limit_priv_esc) > show options ...show and set options...msf undefined(namespace_idmap_limit_priv_esc) > runPrioritise with Active Threat Intelligence
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