Siemens SICAM A8000 RTU Series Uncaught Exception (CVE-2018-13798)

high Tenable OT Security Plugin ID 500226

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in SICAM A8000 CP-8000 (All versions < V14), SICAM A8000 CP-802X (All versions < V14), SICAM A8000 CP-8050 (All versions < V2.00). Specially crafted network packets sent to port 80/TCP or 443/TCP could allow an unauthenticated remote attacker to cause a Denial-of-Service condition of the web server. The security vulnerability could be exploited by an attacker with network access to the affected systems on port 80/TCP or 443/TCP.
Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the web server. A system reboot is required to recover the web service of the device. At the time of advisory update, exploit code for this security vulnerability is public.

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 all product variants and recommends users update to the new versions:

https://support.industry.siemens.com/cs/search?search=a8000%20cp8000

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

- Limit access to the web server on Ports 80/TCP and 443/TCP with an external firewall.
- Apply a Defense-in-Depth strategy.

For additional information see Siemens’ security advisory SSA-579309 at the following location:

http://www.siemens.com/cert/en/cert-security-advisories.htm

Plugin Details

Severity: High

ID: 500226

Version: 1.6

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2018-13798

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:N/I:N/A:H

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

Vulnerability Information

CPE: cpe:/o:siemens:sicam_a8000_cp-8000_firmware, cpe:/o:siemens:sicam_a8000_cp-802x_firmware, cpe:/o:siemens:sicam_a8000_cp-8050_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/21/2019

Vulnerability Publication Date: 3/21/2019

Reference Information

CVE: CVE-2018-13798

CWE: 20

Detections

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