Jul 2023: Microsoft Outlook Security Feature Bypass Vulnerability
CVE-2023-35311 Published on July 11, 2023

Microsoft Outlook Security Feature Bypass Vulnerability
Microsoft Outlook Security Feature Bypass Vulnerability

Vendor Advisory NVD

Known Exploited Vulnerability

This Microsoft Outlook Security Feature Bypass Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.

The following remediation steps are recommended / required by August 1, 2023: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

Vulnerability Analysis

CVE-2023-35311 can be exploited with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a TOCTTOU Vulnerability?

The software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state. This weakness can be security-relevant when an attacker can influence the state of the resource between check and use. This can happen with shared resources such as files, memory, or even variables in multithreaded programs.

CVE-2023-35311 has been classified to as a TOCTTOU vulnerability or weakness.


Products Associated with CVE-2023-35311

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-35311 are published in these products:

Microsoft Outlook
 
Microsoft Office
 
Microsoft 365 Apps
 
Microsoft Office Long Term Servicing Channel
 

Affected Versions

Microsoft 365 Apps for Enterprise: Microsoft Office LTSC 2021: Microsoft Office 2019: Microsoft Outlook 2016: Microsoft Outlook 2013: Microsoft Outlook 2013 Service Pack 1:

Exploit Probability

EPSS
0.48%
Percentile
64.34%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.