|2018-03-22||Other||Siemens||Alexander Bolshev from IOActive, and Ivan Yushkevich from Embedi reported this vulnerability to Siemens.||N/A||CVE-2018-4844 ||N/A||N/A||N/A|
# Siemens SIMATIC WinCC OA UI Mobile App
### VULNERABLE VENDOR
### VULNERABLE PRODUCT
SIMATIC WinCC OA UI mobile app
Alexander Bolshev from IOActive, and Ivan Yushkevich from Embedi reported this vulnerability to Siemens.
### AFFECTED PRODUCTS
Siemens reports that this vulnerability affects the following products:
SIMATIC WinCC OA UI for Android: All versions prior to V3.15.10, and
SIMATIC WinCC OA UI for IOS: All versions prior to V3.15.10
This vulnerability could be exploited by an attacker who tricks an app user to connect to a malicious WinCC OA server. Successful exploitation of this vulnerability could allow an attacker to read and write data from and to the app’s project cache folder.
### VULNERABILITY OVERVIEW
IMPROPER ACCESS CONTROL CWE-284
Insufficient limitation of CONTROL script capabilities could allow read and write access from one HMI project cache folder to other HMI project cache folders within the app’s sandbox on the same mobile device.
This includes HMI project cache folders of other configured WinCC OA servers.
This vulnerability could be exploited by an attacker who tricks an app user to connect to a malicious WinCC OA server.
This could give an attacker the ability to read and write data from and to the app’s project cache folder.
CVE-2018-4844 has been assigned to this vulnerability.
A CVSS v3 base score of 5.1 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N)
Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, Water and Wastewater Systems.
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
Siemens has provided the following updates for mitigation:
SIMATIC WinCC OA UI for Android: Update to V3.15.10 which can be located here:
SIMATIC WinCC OA UI for IOS: Update to V3.15.10 which can be located here:
Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk:
Only connect to a trusted WinCC OA Server.
Follow the SIMATIC WinCC OA Security Guideline for maintaining a secured SIMATIC WinCC OA environment. This guideline is available for registered users at: https://portal.etm.at/index.php?option=com_phocadownload&view=category&id=52:security&Itemid=81
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to run the devices in a protected IT environment, Siemens particularly recommends that users configure the environment according to Siemens’ Operational Guidelines for Industrial Security (https://www.siemens.com/cert/operational-guidelines-industrial-security
), and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at:
For more information on this vulnerability and associated software updates, please see Siemens security notification SSA-822928 on their website: