CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
21.9%
CVSS v3 4.0
Vendor: Siemens
Equipment: SIMATIC WinCC OA iOS App
Vulnerability: File and Directory Information Exposure.
This updated advisory is a follow-up to the original advisory titled ICSA-18-109-01 Siemens SIMATIC WinCC OA Operator iOS App that was published April 19, 2018, on the NCCIC/ICS-CERT.
Successful exploitation of this vulnerability could allow an attacker with physical access to read sensitive data located in the appβs directory.
--------- Begin Update A Part 1 of 2 --------
Siemens reports this vulnerability affects the following product:
--------- End Update A Part 1 of 2 ----------
An attacker with physical access to the mobile device could read unencrypted sensitive data from the appβs directory.
CVE-2018-4847 has been assigned to this vulnerability. A CVSS v3 base score of 4.0 has been calculated; the CVSS vector string is (AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N).
Alexander Bolshev of IOActive and Ivan Yushkevich of Embedi reported this vulnerability to Siemens.
--------- Begin Update A Part 2 of 2 --------
Siemens has recommended that users update to v1.4, which can be located here:
<https://itunes.apple.com/app/simatic-wincc-oa-operator/id681238489>
--------- End Update A Part 2 of 2 ----------
Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk:
As a general security measure, Siemens strongly 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 Siemensβ operational guidelines for Industrial Security (Download: <https://www.siemens.com/cert/operational-guidelines-industrial-security>), and following the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
For more information on this vulnerability and associated mitigation practices, please see Siemens security advisory SSA-597741 on their website:
https://www.siemens.com/cert/advisories
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely. High skill level is needed to exploit.
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cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4847
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CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
21.9%