CVE-2019-0588 : Security Advisory and Response
Learn about CVE-2019-0588, a vulnerability in Microsoft Exchange Server allowing unauthorized access to sensitive information. Find mitigation steps and affected versions here.
A vulnerability in the Microsoft Exchange PowerShell API allows calendar contributors to gain excessive view permissions, leading to information disclosure.
Understanding CVE-2019-0588
What is CVE-2019-0588?
This vulnerability, also known as the "Microsoft Exchange Information Disclosure Vulnerability," affects Microsoft Exchange Server by granting unauthorized access beyond intended restrictions.
The Impact of CVE-2019-0588
The vulnerability allows unauthorized users to view sensitive information, potentially compromising confidentiality and privacy.
Technical Details of CVE-2019-0588
Vulnerability Description
The flaw arises from the Microsoft Exchange PowerShell API granting calendar contributors more view permissions than intended, enabling unauthorized access to sensitive data.
Affected Systems and Versions
- Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 25
- Microsoft Exchange Server 2013 Cumulative Update 21
- Microsoft Exchange Server 2016 Cumulative Update 10
- Microsoft Exchange Server 2016 Cumulative Update 11
- Microsoft Exchange Server 2019
Exploitation Mechanism
Unauthorized users exploit the vulnerability by leveraging the excessive view permissions granted by the Microsoft Exchange PowerShell API to access confidential information.
Mitigation and Prevention
Immediate Steps to Take
- Apply security updates provided by Microsoft promptly.
- Restrict access permissions to minimize the risk of unauthorized disclosure.
Long-Term Security Practices
- Regularly review and adjust access controls to ensure least privilege access.
- Conduct security training to educate users on data protection best practices.
Patching and Updates
Regularly monitor and apply security patches and updates released by Microsoft to address vulnerabilities and enhance system security.