Vulnerability identifier: #VU10108

Vulnerability 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-2018-0102

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco NX-OS
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

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

The weakness exists in the Pong tool of Cisco NX-OS Software due to affected software attempts to free the same area of memory twice. An adjacent attacker can send a pong request to an affected device from a location on the network, trigger the pong reply packet to egress both a FabricPath port and a non-FabricPath port and cause a dual or quad supervisor virtual port-channel (vPC) to reload.

Note: This vulnerability is exploitable only when all of the following are true:

1. The Pong tool is enabled on an affected device. The Pong tool is disabled in NX-OS by default.
2. The FabricPath feature is enabled on an affected device. The FabricPath feature is disabled in NX-OS by default.
3. A FabricPath port is actively monitored via a Switched Port Analyzer (SPAN) session. SPAN sessions are not configured or enabled in NX-OS by default.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco NX-OS: 7.2.1 D.1 - 7.2.2 D1.2

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-nx-os

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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).

Is there known malware, which exploits this vulnerability?

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