Denial of service in Cisco IOS XR Software

Published: 2020-08-29 | Updated: 2020-09-02

Risk	High
Patch available	NO
Number of vulnerabilities	2
CVE ID	CVE-2020-3566 CVE-2020-3569
CWE ID	CWE-400
Exploitation vector	Network
Public exploit	Vulnerability #1 is being exploited in the wild. Vulnerability #2 is being exploited in the wild.
Vulnerable software Subscribe	Cisco ASR 9000 Series Aggregation Services Routers Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco IOS XR Operating systems & Components / Operating system
Vendor	Cisco Systems, Inc

Security Advisory

Updated: 01.09.2020

Added vulnerability #2.

1) Resource exhaustion

Risk: High

CVSSv3: 7.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C] [PCI]

CVE-ID: CVE-2020-3566

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('Resource Exhaustion')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient queue management for Internet Group Management Protocol (IGMP) packets in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software. A remote attacker can trigger resource exhaustion by sending crafted IGMP traffic to the affected device and perform a denial of service (DoS) attack.

Note: this vulnerability is being actively exploited in the wild.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cisco ASR 9000 Series Aggregation Services Routers: 6.4.2, 6.6, 6.6.3, 7.0

Cisco IOS XR: 6.0.1, 6.0.2, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.2.1, 6.2.3, 6.2.25, 6.3.2, 6.3.3, 6.3.15, 6.4.1, 6.4.2, 6.4.3, 6.5.2, 6.5.3, 6.6.1, 6.6.2, 6.6.3, 6.6.25, 7.0.1, 7.0.2, 7.1.1, 7.1.2, 7.1.3, 7.2.1, 7.3.1

CPE