CVE-2021-34754 : Exploit Details and Defense Strategies

Cisco Firepower Threat Defense Software is impacted by multiple vulnerabilities in the payload inspection for Ethernet Industrial Protocol (ENIP) traffic, allowing unauthenticated remote attackers to bypass configured rules. These vulnerabilities are a result of incomplete processing during deep packet inspection for ENIP packets, potentially leading to access control and intrusion policy bypass.

Understanding CVE-2021-34754

This CVE entails multiple vulnerabilities in the payload inspection for Ethernet Industrial Protocol (ENIP) traffic for Cisco Firepower Threat Defense (FTD) Software. The impact includes the ability for an attacker to bypass configured rules for ENIP traffic.

What is CVE-2021-34754?

CVE-2021-34754 involves multiple vulnerabilities in Cisco Firepower Threat Defense Software where unauthenticated remote attackers can bypass configured rules for Ethernet Industrial Protocol (ENIP) traffic, potentially leading to unauthorized access.

The Impact of CVE-2021-34754

The impact of CVE-2021-34754 is significant, as it allows attackers to circumvent configured access control and intrusion policies meant to be activated for ENIP packets, thus posing a serious security risk.

Technical Details of CVE-2021-34754

This section provides detailed technical information regarding CVE-2021-34754.

Vulnerability Description

The vulnerabilities in Cisco Firepower Threat Defense Software are caused by incomplete processing during deep packet inspection for Ethernet Industrial Protocol (ENIP) packets, enabling attackers to bypass configured rules and gain unauthorized access.

Affected Systems and Versions

Cisco Firepower Threat Defense Software versions are affected by these vulnerabilities in the payload inspection for Ethernet Industrial Protocol (ENIP) traffic. Specifically, the processing for ENIP packets is incomplete, allowing for exploitation by remote attackers.

Exploitation Mechanism

Attackers can exploit these vulnerabilities by sending crafted ENIP packets to the targeted interface, bypassing configured access control and intrusion policies meant to secure ENIP traffic.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-34754, immediate and long-term security measures can be implemented.

Immediate Steps to Take

Immediate steps include updating Cisco Firepower Threat Defense Software to the latest version, implementing network security best practices, and monitoring for any unusual network activity.

Long-Term Security Practices

Long-term security practices involve regularly updating software, conducting security audits, educating employees on cybersecurity best practices, and maintaining a robust incident response plan.

Patching and Updates

Regularly applying patches and updates provided by Cisco is essential to address CVE-2021-34754 and ensure the security of Cisco Firepower Threat Defense Software.