CVE-2021-20047 : Vulnerability Insights and Analysis

SonicWall Global VPN client version 4.10.6 and earlier are affected by a critical DLL Search Order Hijacking vulnerability. This vulnerability could allow a local attacker to execute remote code on the target system.

Understanding CVE-2021-20047

This section provides insights into the nature and impact of the CVE-2021-20047 vulnerability.

What is CVE-2021-20047?

The CVE-2021-20047 is a DLL Search Order Hijacking vulnerability found in SonicWall Global VPN Client versions 4.10.6 and earlier. Exploitation of this vulnerability by a local attacker could lead to remote code execution on the target system.

The Impact of CVE-2021-20047

The impact of this vulnerability is severe as it allows unauthorized remote access to the system, potentially leading to data breaches, system compromise, and other malicious activities.

Technical Details of CVE-2021-20047

In this section, we delve into the specifics of the CVE-2021-20047 vulnerability.

Vulnerability Description

The vulnerability arises from a DLL Search Order Hijacking issue present in SonicWall Global VPN Client software version 4.10.6 and earlier. Due to improper handling of DLL loading, an attacker can exploit this flaw for remote code execution.

Affected Systems and Versions

SonicWall Global VPN Client versions 4.10.6 (32-bit and 64-bit) and earlier are affected by this vulnerability. Users with these versions are advised to take immediate action to secure their systems.

Exploitation Mechanism

To exploit CVE-2021-20047, an attacker needs local access to the target system. By placing a malicious DLL file in a location where the application searches for DLLs, the attacker can execute arbitrary code remotely.

Mitigation and Prevention

This section outlines the steps users can take to mitigate the risks posed by CVE-2021-20047.

Immediate Steps to Take

Update SonicWall Global VPN Client to a patched version that addresses the DLL Search Order Hijacking vulnerability.
Monitor network traffic for any suspicious activities that might indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software and security patches to protect against known vulnerabilities.
Implement strong access controls and least privilege principles to restrict unauthorized access to critical systems.

Patching and Updates

SonicWall has released security patches to address CVE-2021-20047. Users are strongly recommended to apply the latest updates provided by SonicWall to secure their systems against this vulnerability.