Denial of service in Cisco Nexus 9000 Series switches

1) Improper input validation

EUVDB-ID: #VU13971

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0372

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists in the DHCPv6 feature of the Cisco Nexus 9000 Series Fabric Switches in Application-Centric Infrastructure (ACI) Mode due to improper memory management when DHCPv6 packets are received on an interface of the targeted device. A remote attacker can send a high number of malicious DHCPv6 packets, cause the system to run low on memory, and trigger an eventual reboot of an affected device.

Mitigation

Update to version 13.0(2k).

Vulnerable software versions

Cisco Nexus 9000 Series Switches: 13.0.1k

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-20180718-nexus-9000-dos

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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