Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2019-1967

Severity CVSS v4.0:
Pending analysis
Type:
CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
30/08/2019
Last modified:
16/10/2020

Description

A vulnerability in the Network Time Protocol (NTP) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to excessive use of system resources when the affected device is logging a drop action for received MODE_PRIVATE (Mode 7) NTP packets. An attacker could exploit this vulnerability by flooding the device with a steady stream of Mode 7 NTP packets. A successful exploit could allow the attacker to cause high CPU and memory usage on the affected device, which could cause internal system processes to restart or cause the affected device to unexpectedly reload. Note: The NTP feature is enabled by default.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete

Base Score 2.0
7.80
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:nx-os:6.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:7.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:8.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:8.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:8.3:*:*:*:*:*:*:*
cpe:2.3:h:cisco:mds_9000:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:mds_9100:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:mds_9140:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:mds_9200:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:mds_9500:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:mds_9700:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(9.7\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)u6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:7.0\(3\)i:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:9.2:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools