module

Glibc Tunables Privilege Escalation CVE-2023-4911 (aka Looney Tunables)

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Disclosed
2023-10-03
Created
2023-12-20

Description

A buffer overflow exists in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES
environment variable. This issue allows an local attacker to use maliciously crafted GLIBC_TUNABLES when
launching binaries with SUID permission to execute code in the context of the root user.

This module targets glibc packaged on Ubuntu and Debian. The specific glibc versions this module targets are:

Ubuntu:
2.35-0ubuntu3.4 > 2.35
2.37-0ubuntu2.1 > 2.37
2.38-1ubuntu6 > 2.38

Debian:
2.31-13-deb11u7 > 2.31
2.36-9-deb12u3 > 2.36

Fedora 37 and 38 and other distributions of linux also come packaged with versions of glibc vulnerable to CVE-2023-4911
however this module does not target them.

Authors

Qualys Threat Research Unit
blasty peter@haxx.in
jheysel-r7

Platform

Linux,Unix

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_tunables_priv_esc
    msf exploit(glibc_tunables_priv_esc) > show targets
        ...targets...
    msf exploit(glibc_tunables_priv_esc) > set TARGET < target-id >
    msf exploit(glibc_tunables_priv_esc) > show options
        ...show and set options...
    msf exploit(glibc_tunables_priv_esc) > exploit
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