Detections
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Siemens BACnet Field Panels Improper Limitation of a Pathname to a Restricted Directory (CVE-2017-9947)
medium Tenable OT Security Plugin ID 500105
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. A directory traversal vulnerability could allow a remote attacker with network access to the integrated web server (80/tcp and 443/tcp) to obtain information on the structure of the file system of the affected devices.This plugin only works with Tenable.ot.
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.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
See Also
https://cert-portal.siemens.com/productcert/pdf/ssa-148078.pdf
http://www.nessus.org/u?8c345dfe
https://www.cisa.gov/news-events/ics-advisories/icsa-17-285-05
Plugin Details
Severity: Medium
ID: 500105
Version: 1.15
Type: remote
Family: Tenable.ot
Published: 2/7/2022
Updated: 4/20/2025
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Low
Score: 2.2
CVSS v2
Risk Factor: Medium
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS Score Source: CVE-2017-9947
CVSS v3
Risk Factor: Medium
Base Score: 5.3
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Vulnerability Information
CPE: cpe:/o:siemens:apogee_pxc_firmware, cpe:/o:siemens:apogee_pxc_modular_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-2017-9947