CVE-2017-3883 : Security Advisory and Response

A security flaw has been identified in the authentication, authorization, and accounting (AAA) implementation of Cisco Firepower Extensible Operating System (FXOS) and NX-OS System Software, potentially allowing unauthenticated attackers to remotely cause affected devices to reload.

Understanding CVE-2017-3883

This CVE involves a vulnerability in Cisco's AAA implementation affecting various Cisco products.

What is CVE-2017-3883?

The vulnerability arises from the AAA processes hindering the NX-OS System Manager from receiving keepalive messages during high login attempt rates, leading to device reloads.

The Impact of CVE-2017-3883

Unauthenticated attackers could remotely force affected devices to reload by exploiting this vulnerability.
Devices running Cisco FXOS or NX-OS System Software configured with AAA services are at risk.

Technical Details of CVE-2017-3883

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The flaw allows attackers to perform brute-force login attacks, causing device reloads.

Affected Systems and Versions

Firepower 4100 Series Next-Generation Firewall
Firepower 9300 Security Appliance
Nexus switches (1000V, 2000, 3000 Series, etc.)
Unified Computing System (UCS) devices

Exploitation Mechanism

Attackers exploit the vulnerability by overwhelming devices with login attempts, triggering reloads.

Mitigation and Prevention

Protecting systems from CVE-2017-3883 requires immediate actions and long-term security practices.

Immediate Steps to Take

Monitor and limit login attempts to prevent brute-force attacks.
Implement strong password policies and multi-factor authentication.

Long-Term Security Practices

Regularly update and patch affected Cisco products.
Conduct security audits and penetration testing to identify vulnerabilities.

Patching and Updates

Cisco has assigned specific Bug IDs to track and resolve the vulnerability.