CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
76.8%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: Reyrolle
Vulnerabilities: Missing Authorization, Improper Input Validation, Improper Authentication
Siemens reports that the vulnerabilities affect the following Reyrolle integration, control, measurement, and automation products:
Successful exploitation of these vulnerabilities could allow an attacker to access sensitive device information, circumvent authentication, and perform administrative actions.
Siemens has released a new firmware version (V4.29.01) to address these vulnerabilities. It can be found at the SIPROTEC 4 downloads area at the following Siemens web site:
<http://www.siemens.com/downloads/siprotec-4>
Siemens recommends users protect network access with appropriate mechanisms such as firewalls, segmentation, and VPN. Siemens also advises that users configure the operational environment according to Siemensโ Operational Guidelines for Industrial Security. Please see the specific product manual for more information. Manuals can be obtained from the downloads menu at the following Siemens web site:
<http://www.siemens.com/gridsecurity>
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-452237 at the following location:
<http://www.siemens.com/cert/advisories>
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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 ICSโCERT Technical Information Paper, ICS-TIP-12-146-01BโTargeted 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:
No known public exploits specifically target these vulnerabilities.
The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain sensitive device information if network access was obtained.
CVE-2016-4784 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain a limited amount of device memory content if network access was obtained.
CVE-2016-4785 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Attackers with network access to the deviceโs web interface (Port 80/TCP) could possibly circumvent authentication and perform certain administrative operations.
CVE-2016-7112 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Specially crafted packets sent to Port 80/TCP could cause the affected device to go into defect mode.
CVE-2016-7113 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Attackers with network access to the deviceโs web interface (Port 80/TCP) could possibly circumvent authentication and perform certain administrative operations. A legitimate user must be logged into the web interface for the attack to be successful.
CVE-2016-7114 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).
Siemens reported these vulnerabilities to ICS-CERT when they made firmware available to fix them.
Critical Infrastructure Sector: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4784
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4785
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7112
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7113
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7114
www.siemens.com/cert/advisories
www.siemens.com/downloads/siprotec-4
www.siemens.com/gridsecurity
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cwe.mitre.org/data/definitions/20.html
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
76.8%