Rockwell Automation Stratix NTP Authentication bypass (CVE-2015-1798)

medium Tenable OT Security Plugin ID 501815

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability in the message authentication code (MAC) validation routine of ntpd could allow an unauthenticated, remote attacker to bypass the NTP authentication feature. The vulnerability is due to incorrect validation of the MAC field. An attacker could exploit this vulnerability by sending unauthenticated NTP packets to an NTP host that is configured with symmetric key authentication. An exploit could allow the attacker to inject NTP packets to the NTP host without knowledge of the NTP symmetric key.

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Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Rockwell Automation has provided a new firmware version, Version 15.6.3, to mitigate these vulnerabilities.

Rockwell Automation encourages users of the affected versions to update to the latest available software versions addressing the associated risk, and including improvements to further harden the software and enhance its resilience against similar malicious attacks. Users can find the latest firmware version by searching for their device at the following web site:

http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?famID=15

Additional precautions and risk mitigation strategies specific to these types of attacks are recommended in the Rockwell Automation security release. When possible, multiple strategies should be implemented simultaneously.

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1041191

Please also refer to Cisco's security advisories (linked below) for additional workarounds and details for these vulnerabilities.

Plugin Details

Severity: Medium

ID: 501815

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 11/15/2023

Updated: 1/17/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 1.8

Temporal Score: 1.3

Vector: CVSS2#AV:A/AC:H/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2015-1798

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/h:rockwellautomation:allen-bradley_stratix_5900_industrial_managed_ethernet_switch

Required KB Items: Tenable.ot/Rockwell

Exploit Ease: No known exploits are available

Patch Publication Date: 4/8/2015

Vulnerability Publication Date: 4/8/2015

Reference Information

CVE: CVE-2015-1798

CWE: 755

Detections

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