Siemens BACnet Field Panels Authentication Bypass Using an Alternate Path or Channel (CVE-2017-9946)

high Tenable OT Security Plugin ID 500107

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in Siemens APOGEE PXC and TALON TC BACnet Automation Controllers in all versions <V3.5. An attacker with network access to the integrated web server (80/tcp and 443/tcp) could bypass the authentication and download sensitive information from the device.

- A vulnerability has been identified in Siemens APOGEE PXC and TALON TC BACnet Automation Controllers in all versions <V3.5. An attacker with network access to the integrated web server (80/tcp and 443/tcp) could bypass the authentication and download sensitive information from the device. (CVE-2017-9946)

Solution

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

Siemens has released updates for several affected products and recommends updating to the latest versions. Siemens recommends countermeasures for products where updates are not, or not yet available.

- APOGEE PXC Compact (BACnet): Update to v3.5 or later version
- APOGEE PXC Compact (P2 Ethernet): Disable the integrated webserver
- APOGEE PXC Modular (BACnet): Update to v3.5 or later version
- APOGEE PXC Modular (P2 Ethernet): Disable the integrated webserver
- TALON TC Compact (BACnet): Update to v3.5 or later version
- TALON TC Modular (BACnet): Update to v3.5 or later version

Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:

- Siemens recommends disabling the integrated webserver when not in use
- Please contact a Siemens office for additional support

As a general security measure Siemens strongly recommends protecting network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.

For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-148078

Plugin Details

Severity: High

ID: 500107

Version: 1.10

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 9/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2017-9946

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: cpe:/o:siemens:apogee_pxc_bacnet_automation_controller_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/23/2017

Vulnerability Publication Date: 10/23/2017

Reference Information

CVE: CVE-2017-9946

CWE: 287

ICSA: 17-285-05

Detections

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