Detections
Analytics
Siemens SCALANCE X-200RNA Switch Devices Incorrect Authorization (CVE-2018-20685)
medium Tenable OT Security Plugin ID 500840
Synopsis
The remote OT asset is affected by a vulnerability.Description
In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.- In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side. (CVE-2018-20685)
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 released updates for the affected product and recommends updating to the latest version:
- Update to V3.2.7 or later version.
Siemens identified the following specific workarounds and mitigations customers can apply to reduce the risk:
- Restrict access to the affected systems, especially to ports 22/tcp and 443/tcp to trusted IP addresses only.
- Deactivate the webserver if not required, and if deactivation is supported by the product.
As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following the recommendations in the product manuals.
Siemens provides additional information on industrial security.
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact Siemens.
For more information, see the associated Siemens security advisory SSA-412672 in HTML and CSAF.
See Also
http://www.nessus.org/u?33d22ce5
http://www.nessus.org/u?ecdd8632
http://www.securityfocus.com/bid/106531
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
https://usn.ubuntu.com/3885-1/
https://www.cisa.gov/news-events/ics-advisories/icsa-22-349-21
https://www.debian.org/security/2019/dsa-4387
https://security.netapp.com/advisory/ntap-20190215-0001/
https://security.gentoo.org/glsa/201903-16
https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html
http://www.nessus.org/u?9166970d
http://www.nessus.org/u?b370bc74
https://access.redhat.com/errata/RHSA-2019:3702
https://security.gentoo.org/glsa/202007-53
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
Plugin Details
Severity: Medium
ID: 500840
Version: 1.4
Type: remote
Family: Tenable.ot
Published: 2/23/2023
Updated: 12/12/2023
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Low
Base Score: 2.6
Temporal Score: 1.9
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N
CVSS Score Source: CVE-2018-20685
CVSS v3
Risk Factor: Medium
Base Score: 5.3
Temporal Score: 4.6
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:siemens:scalance_x204rna_eec_firmware, cpe:/o:siemens:scalance_x204rna_firmware
Required KB Items: Tenable.ot/Siemens
Exploit Ease: No known exploits are available
Patch Publication Date: 1/10/2019
Vulnerability Publication Date: 1/10/2019
Reference Information
CVE: CVE-2018-20685