CVE-2020-3528 : Security Advisory and Response

A vulnerability in the OSPF Version 2 (OSPFv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

Understanding CVE-2020-3528

This CVE involves a vulnerability in Cisco ASA Software and FTD Software that could lead to a DoS attack.

What is CVE-2020-3528?

The vulnerability in OSPFv2 implementation allows attackers to send malicious OSPFv2 packets, causing affected devices to reload and resulting in a DoS condition.

The Impact of CVE-2020-3528

CVSS Base Score: 8.6 (High)
Attack Vector: Network
Availability Impact: High
Successful exploitation could lead to a DoS condition on affected devices.

Technical Details of CVE-2020-3528

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from incomplete input validation when processing OSPFv2 packets with Link-Local Signaling (LLS) data.

Affected Systems and Versions

Affected Product: Cisco Adaptive Security Appliance (ASA) Software
Vendor: Cisco
Affected Version: Not applicable (n/a)

Exploitation Mechanism

Attackers can exploit this vulnerability by sending malformed OSPFv2 packets to affected devices, triggering a reload and causing a DoS condition.

Mitigation and Prevention

Protecting systems from CVE-2020-3528 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor patches and updates promptly.
Monitor network traffic for any suspicious OSPFv2 packets.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Implement network segmentation and access controls.

Patching and Updates

Cisco has released patches to address this vulnerability. Ensure timely application of these patches to mitigate the risk.