ESB-2017.1849 - [Appliance] Continental AG Infineon S-Gold 2: Multiple vulnerabilities 2017-07-28

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1849
                Continental AG Infineon S-Gold 2 (PMB 8876)
                               28 July 2017

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

Product:           Continental AG Infineon S-Gold 2
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        None
CVE Names:         CVE-2017-9647 CVE-2017-9633 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-208-01

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Advisory (ICSA-17-208-01)

Continental AG Infineon S-Gold 2 (PMB 8876)

Original release date: July 27, 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 8.8

ATTENTION: Remotely exploitable/low skill level to exploit. Public exploits
are available.

Vendor: Continental AG

Equipment: Infineon S-Gold 2 (PMB 8876)

Vulnerabilities: Stack-Based Buffer Overflow, Improper Restriction of
Operations within the Bounds of a Memory Buffer

AFFECTED PRODUCTS

All telematics control modules (TCUs) built by Continental AG that contain
the S-Gold 2 (PMB 8876) cellular baseband chipset are affected. The S-Gold 2
(PMB 8876) is found in the following vehicles:

    BMW several models produced between 2009-2010
    Ford - program to update 2G modems has been active since 2016 and
    impact is restricted to the limited number of P-HEV vehicles equipped
    with this older technology that remain in service.
    Infiniti 2013 JX35
    Infiniti 2014-2016 QX60
    Infiniti 2014-2016 QX60 Hybrid
    Infiniti 2014-2015 QX50
    Infiniti 2014-2015 QX50 Hybrid
    Infiniti 2013 M37/M56
    Infiniti 2014-2016 Q70
    Infiniti 2014-2016 Q70L
    Infiniti 2015-2016 Q70 Hybrid
    Infiniti 2013 QX56
    Infiniti 2014-2016 QX 80
    Nissan 2011-2015 Leaf

IMPACT

Successful exploitation of these vulnerabilities could allow a remote
attacker to execute arbitrary code. This may allow an attacker to disable
the infotainment system of the vehicle and affect functional features of
the vehicle. According to affected auto manufacturers, these vulnerabilities
do not directly affect the critical safety features of the vehicle.

MITIGATION

Continental has validated the reported vulnerabilities but has not yet
identified a mitigation plan.

Nissan and Infiniti have issued Technical Service Bulletins (TSB)
asking dealers to advise customers of the issue and offer a free 2G
TCU deactivation. Nissan/Infiniti's 2G cellular service provider no
longer provides 2G services in the U.S. The subject 2G TCUs are no longer
connected to telematics services and no longer perform any function in the
affected vehicles. Nissan/Infiniti have stated that this campaign is being
performed out of abundance of caution to help safeguard against potential
cybersecurity issues.

Nissan/Infiniti proposes that users contact their local Infiniti or Nissan
dealers to have the subject 2G TCUs deactivated free of charge.

BMW has validated the vulnerabilities and will be offering a service
measure to affected customers.

Ford, since 2016, has had a customer satisfaction program to update or
disable legacy 2G modems and there are a limited number of vehicles left on
the market. Ford is reviewing the researcher's findings through internal
processes and evaluating the need for any additional steps.

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.

VULNERABILITY OVERVIEW

Stack-based buffer overflow CWE-121

An attacker with a physical connection to the TCU may exploit a buffer
overflow condition that exists in the processing of AT commands. This may
allow arbitrary code execution on the baseband radio processor of the TCU.

CVE-2017-9647 has been assigned to this vulnerability. A CVSS v3
base score of 6.8 has been assigned; the CVSS vector string is
(AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119

A vulnerability in the temporary mobile subscriber identity (TMSI) may
allow an attacker to access and control memory. This may allow remote code
execution on the baseband radio processor of the TCU.

CVE-2017-9633 has been assigned to this vulnerability. A CVSS v3
base score of 8.8 has been assigned; the CVSS vector string is
(AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

RESEARCHER

Mickey Shkatov, Jesse Michael, and Oleksandr Bazhaniuk of the Advanced
Threat Research Team at McAfee have reported the vulnerabilities.

BACKGROUND

Critical Infrastructure Sector: 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
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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