CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
AI Score
Confidence
Low
EPSS
Percentile
30.3%
Successful exploitation of these vulnerabilities could allow an attacker gaining Windows SYSTEM-level code execution on the service host and may cause the product to crash, leak sensitive information, or connect to the product without proper authentication.
The following PTC Kepware products, are affected:
3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122
KEPServerEX is vulnerable to a buffer overflow which may allow an attacker to crash the product being accessed or leak information.
CVE-2023-5908 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).
3.2.2 IMPROPER VALIDATION OF CERTIFICATE WITH HOST MISMATCH CWE-297
KEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.
CVE-2023-5909 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Shawn Hoffman reported these vulnerabilities to PTC.
PTC has released and recommends users update to the following versions:
Refer to secure configuration guide here.
If additional questions remain, please contact PTC Technical Support.
For more information, see PTC’s advisory.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:
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/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-5908
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-5909
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/297.html
github.com/cisagov/CSAF
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.ptc.com/apps/case_logger_viewer/cs/auth/ssl/log?
twitter.com/CISAgov
twitter.com/intent/tweet?text=PTC%20KEPServerEx+https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.cisa.gov/resources-tools/resources/ics-recommended-practices
www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
www.cisa.gov/topics/industrial-control-systems
www.cisa.gov/topics/industrial-control-systems
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
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-23-334-03&title=PTC%20KEPServerEx
www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-23-334-03
www.oig.dhs.gov/
www.ptc.com/en/support/article/CS405439
www.ptc.com/en/support/refdoc/ThingWorx_Kepware_Server/6.15/ThingWorx%20Kepware%20Server%20Secure%20Deployment%20Guide
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=PTC%20KEPServerEx&body=www.cisa.gov/news-events/ics-advisories/icsa-23-334-03