CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
78.2%
CVSS v3 6.5
ATTENTION: Exploitable remotely/low skill level to exploit
**Vendor:**Siemens
**Equipment:**SIMATIC WinCC Runtime Advanced, WinCC Runtime Professional, WinCC (TIA Portal); HMI Panels
Vulnerabilities: Use of Hard-coded Credentials, Insufficient Protection of Credentials, Cross-site Scripting
Successful exploitation of these vulnerabilities could allow an attacker with network access to the device to read/write variables via SNMP.
The following Siemens SIMATIC products are affected:
3.2.1 USE OF HARD-CODED CREDENTIALS CWE-798
The affected devices offer SNMP read/write capabilities with a hardcoded community string, which may allow an attacker to read/write variables over SNMP. This could compromise the confidentiality and integrity of the affected system.
CVE-2019-6572 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).
3.2.2 INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522
An attacker with network access could potentially obtain a TLS session key and use it to decrypt TLS traffic. This could impact the confidentiality of communications between the device and a legitimate user.
CVE-2019-6576 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
3.2.3 CROSS-SITE SCRIPTING CWE-79
The integrated web server could allow a cross-site scripting (XSS) attack if an attacker is able to modify certain device configuration settings via SNMP. This could impact confidentiality and integrity of the affected system.
CVE-2019-6577 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N).
Siemens ProductCERT reported these vulnerabilities to NCCIC.
Siemens has updates at <https://support.industry.siemens.com/cs/ww/en/view/109763890/> for the following products:
Siemens recommends users apply these specific workarounds and mitigations to reduce risk until an update is available or can be applied:
As a general security measure, Siemens recommends users configure their environment according to Siemensβ operational guidelines for industrial security and follow 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 these vulnerabilities and more detailed mitigation instructions, please see Siemens security advisory SSA-307392 at the following location:
<http://www.siemens.com/cert/advisories>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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 these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6572
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6576
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6577
www.siemens.com/cert/advisories
www.siemens.com/cert/advisories
www.siemens.com/cert/advisories
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-134-09
cwe.mitre.org/data/definitions/522.html
cwe.mitre.org/data/definitions/79.html
cwe.mitre.org/data/definitions/798.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109763890/
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
78.2%