module

Linux Nested User Namespace idmap Limit Local Privilege Escalation

Try Surface Command
Back to search
Disclosed
2018-11-15
Created
2019-03-19

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 Horn
bcoles bcoles@gmail.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/nested_namespace_idmap_limit_priv_esc
    msf exploit(nested_namespace_idmap_limit_priv_esc) > show targets
        ...targets...
    msf exploit(nested_namespace_idmap_limit_priv_esc) > set TARGET < target-id >
    msf exploit(nested_namespace_idmap_limit_priv_esc) > show options
        ...show and set options...
    msf exploit(nested_namespace_idmap_limit_priv_esc) > exploit
Title
NEW

Explore Exposure Command

Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.

Try it today