Denial of service in Cisco NX-OS Software

1) Data Handling

EUVDB-ID: #VU28558

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-10136

CWE-ID: CWE-19 - Data Handling

Exploit availability: No

Description

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

The vulnerability exists due to the affected device unexpectedly decapsulating and processing IP in IP packets that are destined to a locally configured IP address. A remote attacker can send a specially crafted IP in IP packet and cause a denial of service condition on the target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: All versions

Nexus 1000 Virtual Edge for VMware vSphere: 5.2.1 SV5.1.3

Nexus 1000V Switch for Microsoft Hyper-V: 5.2.1 SV3.4.1b

Nexus 1000V Switch for VMware vSphere: 5.2.1 SV3.4.1b

Cisco Nexus 3000 Series Switches: 5.0.3 U5.1f - 6.0.2 U2.4.92.4Z

Nexus 5500 Platform Switches: 7.3.7 N1.1

Nexus 5600 Platform Switches: 7.3.7 N1.1

Cisco Nexus 6000 Series Switches: 7.3.7 N1.1

Cisco Nexus 7000 Series Switches: 6.2.24 - 7.3.5 D1.1

Cisco Nexus 9000 Series Switches NX-OS Mode: 5.0.3 U5.1f - 6.0.2 U2.4.92.4Z

UCS 6200 Series Fabric Interconnects: 3.2.3n A

UCS 6300 Series Fabric Interconnects: 3.2.3n A

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_nx-os:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:nexus_1000_virtual_edge_for_vmware_vsphere:5.2.1 SV5.1.3:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_1000v_switch_for_microsoft_hyper-v:5.2.1 SV3.4.1b:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_1000v_switch_for_vmware_vsphere:5.2.1 SV3.4.1b:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_3000_series_switches:5.0.3 U5.1f:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_3000_series_switches:6.0.2 U2.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_3000_series_switches:6.0.2 U2.4.92.4Z:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_5500_platform_switches:7.3.7 N1.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_5600_platform_switches:7.3.7 N1.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_6000_series_switches:7.3.7 N1.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_7000_series_switches:6.2.24:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_9000_series_switches_nx-os_mode:5.0.3 U5.1f:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:ucs_6200_series_fabric_interconnects:3.2.3n A:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:ucs_6300_series_fabric_interconnects:3.2.3n A:*:*:*:*:*:*:*

External links

https://kb.cert.org/vuls/id/636397/
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4
https://www.digi.com/resources/security

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.