SCADA Vulnerabilities & Exposures (SVE)

CRITIFENCE® SCADA Vulnerabilities and Exposures Database (SVE)

[SVE-954532079] Siemens SIMATIC CP 343-1/CP 443-1 Modules and SIMATIC S7-300/S7-400 CPUs Vulnerabilities

Date Type Platform Author EDB-ID CVE-ID OSVDB-ID Download App SIS Signature
2016-11-22OtherSiemensSiemensN/ACVE-2016-8673 CVE-2016-8672 N/AN/AN/A

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# Siemens SIMATIC CP 343-1/CP 443-1 Modules and SIMATIC S7-300/S7-400 CPUs Vulnerabilities
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### OVERVIEW

Siemens has released an advisory regarding vulnerabilities affecting SIMATIC CP 343-1 Advanced/CP-443-1 Advanced devices and SIMATIC S7-300/S7-400 CPUs. Inverse Path auditors and the Airbus ICT Industrial Security team reported these vulnerabilities directly to Siemens. Siemens has made new firmware versions available for several products and a temporary fix for the remaining affected products to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely.



### AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following SIMATIC products:
SIMATIC CP 343-1 Advanced: All versions prior to V3.0.53,
SIMATIC CP 443-1 Advanced: All versions,
SIMATIC S7-300 CPU family: All firmware versions, and
SIMATIC S7-400 CPU family: All firmware versions.



### IMPACT

Under certain conditions, an attacker could use these vulnerabilities to perform operations as an authenticated user.
Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.



### BACKGROUND

Siemens is a multinational company headquartered in Munich, Germany.
Communication Processor (CP) modules SIMATIC CP 343-1 Advanced and CP 443-1 Advanced are designed to enable SIMATIC S7-300/S7-400 CPUs to communicate via Ethernet.
According to Siemens, several critical infrastructure (CI) sectors deploy these products, including Chemical, Critical Manufacturing, and Food and Agriculture. Siemens estimates that users of these products are located worldwide.



### VULNERABILITY CHARACTERIZATION

# VULNERABILITY OVERVIEW

INSUFFICIENT VERIFICATION OF DATA AUTHENTICITYa
The integrated web server at Port 80/TCP or Port 443/TCP of the affected devices could allow remote attackers to perform actions with the permissions of an authenticated user, provided the targeted user has an active session and is induced to trigger the malicious request.
CVE-2016-8673b has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)

SENSITIVE COOKIE IN HTTPS SESSION WITHOUT 'SECURE' ATTRIBUTEd
The integrated web server delivers cookies without the "secure" flag. Modern browsers interpreting the flag would mitigate potential data leakage in case of clear text transmission.
CVE-2016-8672e has been assigned to this vulnerability. A CVSS v3 base score of 4.0 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N)




### VULNERABILITY DETAILS

# EXPLOITABILITY

These vulnerabilities could be exploited remotely.



# EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.



# DIFFICULTY

An attacker with a low skill may be able to exploit these vulnerabilities.



### MITIGATION

Siemens provides firmware versions that fix the vulnerabilities and recommends that users update to the fixed versions:
SIMATIC CP 343-1 Advanced: Update to V3.0.53:
https://support.industry.siemens.com/cs/ww/en/view/109742236


For SIMATIC CP 443-1 Advanced devices, Siemens recommends the following mitigations:
Restrict web server access to the internal network,
Use VPN for protecting network communication on the external network interface, and
Follow operational guidelines.
For SIMATIC S7-300/S7-400 CPUs, Siemens recommends the following mitigations:
Apply cell protection concept,
Use VPN for protecting network communication between cells, and
Apply Defense-in-Depth.
Siemens strongly recommends users protect network access to SIMATIC S7-300/S7-400 CPUs and to the web interface of SIMATIC CP 343-1 Advanced and CP 443-1 Advanced devices with appropriate mechanisms
Siemens also advises that users configure the protected operational environment according to Siemens' Operational Guidelines for Industrial Security:
https://www.siemens.com/cert/operational-guidelines-industrial-security


For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-603476 at the following location:
http://www.siemens.com/cert/advisories


Siemens will update SSA-603476 and