CVE-2021-1386 Explained : Impact and Mitigation
Learn about CVE-2021-1386, a critical DLL hijacking vulnerability in Cisco AMP for Endpoints, enabling attackers to execute arbitrary code with SYSTEM privileges. Find mitigation steps here.
A vulnerability in the dynamic link library (DLL) loading mechanism in Cisco Advanced Malware Protection (AMP) for Endpoints Windows Connector, ClamAV for Windows, and Immunet allows an authenticated, local attacker to perform a DLL hijacking attack on an affected Windows system.
Understanding CVE-2021-1386
This CVE highlights a critical vulnerability in Cisco AMP for Endpoints, potentially leading to the execution of arbitrary code with SYSTEM privileges.
What is CVE-2021-1386?
The vulnerability arises from insufficient validation of directory search paths at runtime, enabling an attacker with valid credentials to place a malicious DLL file on the system. If exploited successfully, the attacker can execute arbitrary code with SYSTEM privileges.
The Impact of CVE-2021-1386
The CVSS V3.1 base score of 7.0 reflects a high-severity vulnerability with significant impacts on confidentiality, integrity, and availability of the affected systems. While there have been no reported malicious exploits, the risk of DLL hijacking remains.
Technical Details of CVE-2021-1386
This section delves into the specifics of the vulnerability.
Vulnerability Description
The vulnerability allows an authenticated, local attacker to perform DLL hijacking on the affected system by placing a malicious DLL file due to insufficient validation of directory search paths.
Affected Systems and Versions
Affected systems include Cisco AMP for Endpoints with all versions.
Exploitation Mechanism
An attacker with valid credentials can exploit the vulnerability by placing a malicious DLL file on the affected system, potentially executing arbitrary code with SYSTEM privileges.
Mitigation and Prevention
To safeguard your systems from CVE-2021-1386, consider the following measures:
Immediate Steps to Take
- Apply vendor patches and updates promptly.
- Monitor for any unauthorized system changes.
Long-Term Security Practices
- Implement least privilege access controls.
- Conduct regular security audits and assessments.
Patching and Updates
Regularly check for security advisories from Cisco and apply patches as recommended.