Input validation flaw in processing CDP packets in Cisco Nexus 1000v Application Virtual Switch

1) Input validation flaw in processing CDP packets

EUVDB-ID: #VU229

Risk: Medium

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

CVE-ID: CVE-2016-1465

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause denial of service conditions on the target system.

The vulnerability exists due to insufficient input validation of Cisco Discovery Protocol packets. A remote unauthenticated attacker can cause the ESXi hypervisor to crash and display a purple diagnostic screen by sending a crafted Cisco Discovery Protocol packet to a targeted device.

Successful exploitation of this vulnerability may result in denial of service condition.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco Nexus 1000v Application Virtual Switch: 5.2.1 SV3.1.1 - 5.2.1 SV3.1.5c

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160727-avs

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.