CVE-2020-3569 : Exploit Details and Defense Strategies

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities

Understanding CVE-2020-3569

Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to crash the Internet Group Management Protocol (IGMP) process or cause memory exhaustion.

What is CVE-2020-3569?

These vulnerabilities stem from the incorrect handling of IGMP packets in Cisco IOS XR Software, enabling attackers to disrupt processes on affected devices by sending crafted IGMP traffic.

The Impact of CVE-2020-3569

Attackers can crash the IGMP process or exhaust memory, destabilizing other critical processes on the device.
Memory consumption may lead to instability in interior and exterior routing protocols.

Technical Details of CVE-2020-3569

Vulnerability Description

Vulnerabilities in the DVMRP feature of Cisco IOS XR Software
Incorrect handling of IGMP packets

Affected Systems and Versions

Product: Cisco IOS XR Software
Vendor: Cisco
Version: n/a

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Availability Impact: High
CVSS Base Score: 8.6 (High)
Privileges Required: None

Mitigation and Prevention

Immediate Steps to Take

Implement appropriate mitigations recommended by Cisco

Long-Term Security Practices

Regularly monitor for security updates and patches
Conduct security assessments to identify vulnerabilities

Patching and Updates

Cisco will release software updates to address these vulnerabilities