7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
59.5%
This updated advisory is a follow-up to the original advisory titled ICSA-21-180-05 AVEVA System Platform that was published June 29, 2021, on the ICS webpage on us-cert.cisa.gov.
Successful exploitation of these vulnerabilities, if exploited and chained together, could allow a malicious entity to achieve arbitrary code execution with system privileges or cause a denial-of-service condition.
The software does not perform any authentication for functionality that requires a provable user identity.
CVE-2021-33008 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
An exception is thrown from a function, but it is not caught, which may cause a denial-of-service condition.
CVE-2021-33010 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:N/I:N/A:H).
--------- Begin Update A Part 1 of 1 ---------
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2021-32981 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
The software does not properly verify that the source of data or communication is valid.
CVE-2021-32985 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
The software does not verify, or incorrectly verifies, the cryptographic signature for data.
CVE-2021-32977 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
--------- End Update A Part 1 of 1 ---------
Sharon Brizinov of Claroty reported these vulnerabilities to AVEVA.
AVEVA recommends organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
AutoBuild service is intended to be used only on the GR Node of System Platform during configuration. If the AutoBuild service is enabled on any Runtime nodes, it should be disabled. Furthermore, if the AutoBuild functionality is not used on the GR Node, the AutoBuild service can be disabled on the GR Node as an alternative mitigation that does not require patching.
AVEVA recommends users who need to continually use the AutoBuild functionality and cannot disable it in System Platform Versions 2017 through 2020 R2 P01 (inclusive) are affected by the vulnerabilities and should first upgrade to one of the System Platform versions listed below, then apply the corresponding security update:
Please see AVEVA’s security bulletin AVEVA-2021-002 for more information.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 us-cert.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 us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted 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 these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-32977
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-32981
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-32985
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-33008
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-33010
cwe.mitre.org/data/definitions/22.html
cwe.mitre.org/data/definitions/248.html
cwe.mitre.org/data/definitions/306.html
cwe.mitre.org/data/definitions/346.html
cwe.mitre.org/data/definitions/347.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
softwaresupportsp.aveva.com/#/connectivityhub/details?id=24f8a620-7b2e-4cd9-5973-08d91f9da2f8
softwaresupportsp.aveva.com/#/connectivityhub/details?id=24f8a620-7b2e-4cd9-5973-08d91f9da2f8
softwaresupportsp.aveva.com/#/connectivityhub/details?id=ab14203d-b658-4ffa-fdb1-08d8b7ea05ec
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us-cert.cisa.gov/ics/alerts/ICS-ALERT-10-301-01
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.aveva.com/content/dam/aveva/documents/support/cyber-security-updates/SecurityBulletin_AVEVA-2021-002.pdf
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mailto:?subject=AVEVA%20System%20Platform%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-21-180-05
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4 High
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
59.5%