Information disclosure in Microsoft Office and Microsoft Outlook - CVE-2023-23397
Published: March 14, 2023 / Updated: November 22, 2024
Vulnerability identifier: #VU73511
CSH Severity: Critical
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-23397
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to the application leaks the Net-NTLMv2 hash. A remote attacker can send a specially crafted email to the victim and obtain the Net-NTLMv2 hash of the Windows account. The victim does not need to open the email, as the vulnerability is triggered automatically when it is retrieved and processed by the email server, e.g. before the email is viewed in the preview pane.
The obtained NTLMv2 hash can be used in the NTLM Relay attack against another service to authenticate as the user.
Note, the vulnerability is being actively exploited in the wild.
Affected software
Microsoft Office
Microsoft Outlook
Microsoft Outlook
How to mitigate CVE-2023-23397
Install updates from vendor's website.
Links to Public Exploits and PoC-codes
- Exploit #10894 - CVE-Vulnerability-Research (This repository focuses on exploring Common Vulnerabilities and Exposures (CVE), a standardized system for identifying and cataloging known cybersecurity vulnerabilities. It includes in-depth research on CVE impacts, exploitati (November 22, 2024)
- Exploit #10467 - CVE-2023-23397 (Simple PoC of the CVE-2023-23397 vulnerability with the payload sent by email.) (August 30, 2024)
- Exploit #9445 - CVE-2023-23397 (This script exploits CVE-2023-23397, a Zero-Day vulnerability in Microsoft Outlook, allowing the generation of malicious emails for testing and educational purposes.) (December 19, 2023)
- Exploit #9161 - CVE-2023-23397 (Simple PoC in PowerShell for CVE-2023-23397) (June 27, 2023)
- Exploit #8923 - CVE-2023-23397_EXPLOIT (Generates meeting requests taking advantage of CVE-2023-23397. This requires the outlook thick client to send.) (March 18, 2023)
- Exploit #8920 - CVE-2023-23397-POC (Exploit POC for CVE-2023-23397) (March 17, 2023)
- Exploit #8918 - CVE-2023-23397_EXPLOIT_0DAY (Exploit for the CVE-2023-23397) (March 16, 2023)