ESB-2017.1754 - [Win] Siemens SiPass integrated: Multiple vulnerabilities 2017-07-14

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1754
            Advisory (ICSA-17-194-01) Siemens SiPass integrated
                               14 July 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens SiPass integrated
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Administrator Compromise       -- Remote/Unauthenticated
                   Access Privileged Data         -- Remote/Unauthenticated
                   Modify Arbitrary Files         -- Existing Account      
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-9942 CVE-2017-9941 CVE-2017-9940
                   CVE-2017-9939  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-194-01

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Advisory (ICSA-17-194-01)

Siemens SiPass integrated

Original release date: July 13, 2017

Legal Notice

All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security 
(DHS) does not provide any warranties of any kind regarding any information 
contained within. DHS does not endorse any commercial product or service, 
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For 
more information about TLP, see http://www.us-cert.gov/tlp/.

CVSS v3 9.8

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Siemens

Equipment: SiPass integrated

Vulnerabilities: Improper Authentication, Improper Privilege Management, 
Channel Accessible by Non-Endpoint, Storing Passwords in a Recoverable Format

AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following SiPass 
integrated access control system:

SiPass integrated: All versions prior to V2.70

IMPACT

Successful exploitation of these vulnerabilities could allow an 
unauthenticated attacker with network access to the server to perform 
administrative operations.

MITIGATION

Siemens provides SiPass integrated V2.70, which fixes the vulnerabilities, and
recommends users update to the new version. The new version can be obtained 
from Siemens customer support or from authorized partners.

For more information on these vulnerabilities and more detailed mitigation 
instructions, please see Siemens Security Advisory SSA-339433 at the following
location:

http://www.siemens.com/cert/advisories (link is external)

NCCIC/ICS-CERT recommends that users take defensive measures to minimize the 
risk of exploitation of these vulnerabilities. Specifically, users should:

Minimize network exposure for all control system devices and/or systems, and 
ensure that they are not accessible from the Internet.

Locate control system networks and remote devices behind firewalls, and 
isolate them from the business network.

When remote access is required, use secure methods, such as Virtual Private 
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize that VPN is only
as secure as the connected devices.

ICS-CERT reminds organizations to perform proper impact analysis and risk 
assessment prior to deploying defensive measures.

ICS-CERT 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 in the ICS-CERT Technical Information Paper, 
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation 
Strategies, that is available for download from the ICS-CERT web site.

Organizations observing any suspected malicious activity should follow their 
established internal procedures and report their findings to ICS-CERT for 
tracking and correlation against other incidents.

In addition, ICS-CERT recommends that users take the following measures to 
protect themselves from social engineering attacks:

Do not click web links or open unsolicited attachments in email messages.

Refer to Recognizing and Avoiding Email Scams for more information on avoiding
email scams.

Refer to Avoiding Social Engineering and Phishing Attacks for more information
on social engineering attacks.

No known public exploits specifically target these vulnerabilities.

VULNERABILITY OVERVIEW

IMPROPER AUTHENTICATION CWE-287

An attacker with network access to the SiPass integrated server could bypass 
the authentication mechanism and perform administrative operations.

CVE-2017-9939 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

IMPROPER PRIVILEGE MANAGEMENT CWE-269

An attacker with access to a low-privileged user account can read or write 
files on the file system of the SiPass integrated server over the network.

CVE-2017-9940 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).

CHANNEL ACCESSIBLE BY NON-ENDPOINT ('MAN-IN-THE-MIDDLE') CWE-300

An attacker in a Man-in-the-Middle position between the SiPass integrated 
server and SiPass integrated clients could read or modify the network 
communication.

CVE-2017-9941 has been assigned to this vulnerability. A CVSS v3 base score of
7.4 has been calculated; the CVSS vector string is 
(AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).

STORING PASSWORDS IN A RECOVERABLE FORMAT CWE-257

An attacker with local access to the SiPass integrated server or SiPass 
integrated client could potentially obtain credentials from the systems.

CVE-2017-9942 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been calculated; the CVSS vector string is 
(AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

RESEARCHER

Siemens reported these vulnerabilities.

BACKGROUND

Critical Infrastructure Sectors: Energy, Healthcare and Public Health, 
Transportation Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 
http://ics-cert.us-cert.gov

ICS-CERT continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 
product.

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