module

glibc 'realpath()' Privilege Escalation

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Disclosed
01/16/2018
Created
06/14/2018

Description

This module attempts to gain root privileges on Linux systems by abusing
a vulnerability in GNU C Library (glibc) version 2.26 and prior.

This module uses halfdog's RationalLove exploit to exploit a buffer
underflow in glibc realpath() and create a SUID root shell. The exploit
has offsets for glibc versions 2.23-0ubuntu9 and 2.24-11+deb9u1.

The target system must have unprivileged user namespaces enabled.

This module has been tested successfully on Ubuntu Linux 16.04.3 (x86_64)
with glibc version 2.23-0ubuntu9; and Debian 9.0 (x86_64) with glibc
version 2.24-11+deb9u1.

Authors

halfdogbcoles

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/glibc_realpath_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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