7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
0.001 Low
EPSS
Percentile
33.0%
Successful exploitation of this vulnerability could allow an unauthenticated attacker to read files on the system.
TEL-STER reports this vulnerability affects the following versions of TelWin SCADA WebInterface:
3.2.1 PATH TRAVERSAL CWE-35
External input could be used on TEL-STER TelWin SCADA WebInterface to construct paths to files and directories without properly neutralizing special elements within the pathname, which could allow an unauthenticated attacker to read files on the system.
CVE-2023-0956 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:H/I:N/A:N).
Marcin Dudek of CERT.PL reported this vulnerability to TEL-STER.
TEL-STER recommends that users update WebInterface module to one of the following versions: 6.2, 7.2, 8.1, 9.1, or 10.0. Please note that the WebInterface is part of the TelWin SCADA software and is usually updated with the software. TEL-STER only currently supports and updates TelWin SCADA 7.8 (WebInteraface 6.x) upwards TEL-STER does not have any updates planned for versions using older vulnerable WebInterface (lower than 6.0), and users are recommended to update TelWin SCADA to one of the supported versions. For more information, please contact TEL-STER.
More information about this issue and the associated mitigation can be found at TEL-STER advisory or CERT.PL advisory.
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 at 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.
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 exploits specifically target this vulnerability. This vulnerability is exploitable remotely. This vulnerability has low attack complexity.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-0956
cert.pl/posts/2023/07/CVE-2023-0956/
cisa.gov/ics
cisa.gov/ics
cwe.mitre.org/data/definitions/35.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=TEL-STER%20TelWin%20SCADA%20WebInterface+https://www.cisa.gov/news-events/ics-advisories/icsa-23-215-03
us-cert.cisa.gov/ics/Recommended-Practices
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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
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www.first.org/cvss/calculator/3.0#CVSS:3.0/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-23-215-03
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-23-215-03
www.tel-ster.pl/index.php/en/telwin-scada-eng/news-telwin-eng
www.tel-ster.pl/index.php/telwin-scada/nowosci/372-telwin-scada-podatnosc-cve-2023-0956
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
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