Buffer overflow in Cisco Nexus 9000 Series ACI Mode Switch Software

1) Buffer overflow

EUVDB-ID: #VU19606

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1901

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows an attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges.

The vulnerability exists due to improper input validation of certain type, length, value (TLV) fields of the Link Layer Discovery Protocol (LLDP) frame header. An attacker can send a specially crafted LLDP packet to the targeted device, trigger memory corruption and cause a DoS condition or execute arbitrary code with root privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: This vulnerability cannot be exploited by transit traffic through the device; the crafted packet must be targeted to a directly connected interface.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco Nexus 9000 Series Switches in ACI Mode: before 14.2.0.132

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190731-nxos-bo

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.