CVE-2021-40424 : Exploit Details and Defense Strategies

Webroot Secure Anywhere 21.4 is affected by an out-of-bounds read vulnerability in the IOCTL GetProcessCommand and B_03, potentially leading to denial of service when a specially crafted executable is executed.

Understanding CVE-2021-40424

This CVE involves an out-of-bounds read vulnerability in a specific version of Webroot Secure Anywhere, which could be exploited to trigger denial of service.

What is CVE-2021-40424?

Vulnerability Type: Out-of-bounds Read (CWE-125)
CVSS Base Score: 7.1 (High)
Attack Vector: Local
Privileges Required: None
Impact: High availability impact

The Impact of CVE-2021-40424

The vulnerability allows attackers to issue specially-crafted requests to trigger the out-of-bounds read, potentially causing denial of service.

Technical Details of CVE-2021-40424

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The IOCTL GetProcessCommand and B_03 in Webroot Secure Anywhere 21.4 is prone to an out-of-bounds read.
An attacker can leverage this vulnerability by sending a crafted executable.

Affected Systems and Versions

Product: Secure Anywhere
Vendor: Webroot
Vulnerable Version: 21.4

Exploitation Mechanism

The vulnerability can be exploited by issuing IOCTL requests to trigger the out-of-bounds read in the device driver WRCore_x64.

Mitigation and Prevention

To safeguard systems from CVE-2021-40424, consider the following steps:

Immediate Steps to Take

Update Webroot Secure Anywhere to the latest version.
Monitor for any unusual system behavior that may indicate exploitation.

Long-Term Security Practices

Regularly educate users on identifying and avoiding suspicious executables.
Implement proper input validation checks in software to mitigate similar vulnerabilities.

Patching and Updates

Stay informed about security patches released by Webroot.
Apply patches promptly to ensure system security.