CVE-2020-3991 Explained : Impact and Mitigation
Learn about CVE-2020-3991, a denial-of-service vulnerability in VMware Horizon Client for Windows (5.x before 5.5.0) due to file system access control issues during installation, potentially leading to system disruption.
VMware Horizon Client for Windows (5.x before 5.5.0) contains a denial-of-service vulnerability due to a file system access control issue during install time. An attacker could exploit this issue to overwrite admin privileged files through a symbolic link attack, leading to a denial-of-service condition.
Understanding CVE-2020-3991
This CVE identifies a denial-of-service vulnerability in VMware Horizon Client for Windows.
What is CVE-2020-3991?
CVE-2020-3991 is a vulnerability in VMware Horizon Client for Windows that allows attackers to trigger a denial-of-service condition by manipulating file system access control during installation.
The Impact of CVE-2020-3991
The exploitation of this vulnerability can result in a denial-of-service condition on the affected machine, potentially disrupting normal operations.
Technical Details of CVE-2020-3991
VMware Horizon Client for Windows (5.x before 5.5.0) is susceptible to a specific denial-of-service vulnerability.
Vulnerability Description
The vulnerability arises from a file system access control issue during installation, enabling attackers to overwrite critical admin privileged files through a symbolic link attack.
Affected Systems and Versions
- Product: VMware Horizon Client for Windows
- Versions Affected: VMware Horizon Client for Windows (5.x before 5.5.0)
Exploitation Mechanism
Attackers can exploit this vulnerability by leveraging a symbolic link attack during the installation process, leading to a denial-of-service scenario.
Mitigation and Prevention
To address CVE-2020-3991, users and administrators should take immediate steps and implement long-term security practices.
Immediate Steps to Take
- Update VMware Horizon Client for Windows to version 5.5.0 or newer to mitigate the vulnerability.
- Monitor system logs for any suspicious activities that could indicate exploitation.
Long-Term Security Practices
- Regularly update software and apply security patches to prevent known vulnerabilities.
- Implement least privilege access controls to limit the impact of potential attacks.
Patching and Updates
Ensure timely installation of security updates and patches provided by VMware to address CVE-2020-3991.