Denial of service in Cisco Nexus 7000 Series Switches

1) Denial of service

EUVDB-ID: #VU6986

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6655

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows an adjacent unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the Fibre Channel over Ethernet (FCoE) protocol implementation for Cisco NX-OS System Software due to a lack of proper FCoE frame padding validation. A remote attacker can send a stream of specially crafted FCoE frames to a target device and cause FCoE-related process to reload.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco Nexus 7000 Series Switches: 8.3.0 CV.0.833

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170607-nxos

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

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.