CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
35.5%
As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemensβ ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
Successful exploitation of this vulnerability could allow an authenticated remote attacker to inject arbitrary parameters when starting the Ultralight Client via the web interface.
The following versions of Siemens SIMATIC WinCC OA, a human machine interface (HMI), are affected:
3.2.1 IMPROPER NEUTRALIZATION OF ARGUMENT DELIMITERS IN A COMMAND (βARGUMENT INJECTIONβ) CWE-88
The affected component allows injection of custom arguments into the Ultralight Client backend application under certain circumstances. This could allow an authenticated remote attacker to inject arbitrary parameters when starting the client via the web interface (e.g., open attacker chosen panels with the attackerβs credentials or start a Ctrl script).
CVE-2022-44731 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:N/S:U/C:L/I:L/A:N).
Siemens reported this vulnerability to CISA.
Siemens released updates for several affected products and recommends updating to the latest versions. Siemens is preparing further updates and recommends specific countermeasures for products where updates are not, or not yet, available.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemensβ operational guidelines for industrial security and to follow the recommendations in the product manuals.
For more information, see Siemens security advisory SSA-547714 in HTML or CSAF.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. 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 webpage on cisa.gov 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 CISA for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-44731
cert-portal.siemens.com/productcert/csaf/ssa-547714.json
cert-portal.siemens.com/productcert/html/ssa-547714.html
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-22-349-06
cwe.mitre.org/data/definitions/88.html
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20SIMATIC%20WinCC%20OA%20Ultralight%20Client+https://www.cisa.gov/news-events/ics-advisories/icsa-22-349-06
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/recommended-practices
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.cisa.gov/uscert/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-22-349-06&title=Siemens%20SIMATIC%20WinCC%20OA%20Ultralight%20Client
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-22-349-06
www.oig.dhs.gov/
www.siemens.com/cert/operational-guidelines-industrial-security
www.usa.gov/
www.whitehouse.gov/
www.winccoa.com/documentation/WinCCOA/3.18/en_US/UserAdmin/security.html
www.winccoa.com/downloads/category/versions-patches.html
www.winccoa.com/downloads/category/versions-patches.html
www.winccoa.com/downloads/category/versions-patches.html
www.youtube.com/@cisagov
mailto:?subject=Siemens%20SIMATIC%20WinCC%20OA%20Ultralight%20Client&body=www.cisa.gov/news-events/ics-advisories/icsa-22-349-06