module

Linux Nested User Namespace idmap Limit Local Privilege Escalation

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Disclosed
11/15/2018
Created
03/19/2019

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).

Authors

Jann Hornbcoles

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/nested_namespace_idmap_limit_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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