The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
High
PR
The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Microsoft Office365 Integrity Validation / Remote Code Execution
# Exploit Title: Microsoft Office365 Remote Code Execution Vulnerability
# Date: 2/11/19
# Exploit Author: Social Engineering Neo - @EngineeringNeo
# Vendor Homepage: https://microsoft.com
# Software Link: https://office.com
# Version: Office365/ProPlus (build 16.0.11727.20222, 16.0.11901.20170, 16.0.11901.20204 & 16.0.11929.202.88)
# Tested on: Windows 10 (build 17763.253, 18362.295 & 18362.356)
Affected Platforms: -
Microsoft Windows 10
Office365 & ProPlus Products 2019
Tested On: -
Windows 10 (build 17763.253, 18362.295 & 18362.356)
Office365/ProPlus (build 16.0.11727.20222, 16.0.11901.20170, 16.0.11901.20204 & 16.0.11929.202.88)
Most up to-date version of Microsoft Windows & Office365/ProPlus Products are affected.
Base: -
CWE-325 - Missing Required Cryptographic Step.
The software does not implement a required step in a cryptographic algorithm used to validate the original integrity of documents.
Summary: -
Improper Integrity Validation of Office Documents Resulting in Multiple Microsoft Office Products Suffering from a Protection Bypass Vulnerability. Allowing Auto-Execution of Macro Code Inside Macro-Enabled Office Documents.
Short Description: -
Overwriting an original macro-enabled document with a malicious document will bypass the built-in protections.
Long Description: -
A user creates a macro-enabled MS Word document and saves the document with text/data inside.
If the user deletes the document and downloads a completely different document with the same name, this can allow remote code execution.
When a document is opened/edited, Office apps keep a record of the name and permissions associated with the specific document.
This can be abused when downloading a malicious document to run code remotely on the machine.
Proof of Concept: -
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Tested on Latest Versions of Access, Excel, InfoPath, OneNote, Outlook, PowerPoint, Project, Publisher, Visio, Word.
Affects Access, Excel, InfoPath, PowerPoint, Visio, Word.
Does not affect OneNote, Outlook, Project, Publisher.
ATTACKER: -
Step 0.) - Knowledge of Office document names on VICTIM device.
Step 1.) - Inject malicious VBA macro code & payload into Office document. *preferably AV evasive*
Step 2.) - Send malicious macro-enabled document to VICTIM through internet.
Step 3.) - Setup bind/reverse connection.
VICTIM: -
Step 1.) - Download document sent by ATTACKER.
Step 2.) - Open Document in same location as previous document.
[CODE EXECUTION SUCCESSFUL]
VIDEO: - https://youtu.be/YVF7gqWZSGE
=====
Expected Result: -
It shouldn't be possible to automatically execute macro code on the host machine without user consent or additional configuration.
(Clean Install)
Observed Result: -
Office document auto-executes macro code upon loading document without any user consent, in our case leading to remote code execution.
(User Level Access)
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