CVE-2021-1237 : Vulnerability Insights and Analysis

A detailed analysis of a vulnerability in the Network Access Manager and Web Security Agent components of Cisco AnyConnect Secure Mobility Client for Windows that could allow an authenticated, local attacker to perform a DLL injection attack.

Understanding CVE-2021-1237

This section delves into the specifics of CVE-2021-1237, highlighting the vulnerability, impact, and affected systems.

What is CVE-2021-1237?

CVE-2021-1237 involves a flaw in Cisco AnyConnect Secure Mobility Client for Windows, allowing an attacker with local authenticated access to execute a DLL injection attack by exploiting insufficient validation of runtime-loaded resources.

The Impact of CVE-2021-1237

An attacker could leverage this vulnerability to inject a malicious DLL file causing arbitrary code execution on the target machine with SYSTEM privileges.

Technical Details of CVE-2021-1237

This section outlines the technical aspects, including vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from inadequate validation of resources loaded by the application, enabling an attacker to insert a configuration file that loads a malicious DLL during application startup.

Affected Systems and Versions

The affected product is Cisco AnyConnect Secure Mobility Client for Windows with the vulnerability present in all versions.

Exploitation Mechanism

To exploit CVE-2021-1237, an attacker needs valid credentials on the Windows system to inject a configuration file in a specific path, triggering the execution of a malicious DLL file.

Mitigation and Prevention

Explore the mitigation strategies and best practices to secure systems against CVE-2021-1237.

Immediate Steps to Take

Immediately update Cisco AnyConnect Secure Mobility Client for Windows to the latest patch provided by Cisco to prevent exploitation of the vulnerability.

Long-Term Security Practices

Implement a robust security policy, regularly update software, and educate users on best security practices to mitigate the risk of similar attacks.

Patching and Updates

Regularly monitor for security advisories from Cisco, apply patches promptly, and maintain a proactive approach to system security.