6.5 Medium
CVSS3
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.6 High
AI Score
Confidence
Low
3.3 Low
CVSS2
Access Vector
ADJACENT_NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:A/AC:L/Au:N/C:N/I:P/A:N
0.002 Low
EPSS
Percentile
64.3%
Successful exploitation of these vulnerabilities could allow an attacker to direct a client that is connected to a TropOS Wi-Fi access point to fake websites and extract sensitive data.
Hitachi ABB Power Grids reports these vulnerabilities affect the following products:
The 802.11 standard that underpins Wi-Fi protected access (WPA, WPA2, and WPA3) and wired equivalent privacy (WEP) does not require received fragments be cleared from memory after (re)connecting to a network. Under the right circumstances, when another device sends fragmented frames encrypted using WEP, CCMP, or GCMP, this vulnerability can be exploited to inject arbitrary network packets and/or exfiltrate user data.
CVE-2020-24586 has been assigned to this vulnerability. A CVSS v3 base score of 3.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).
The 802.11 standard that underpins Wi-Fi protected access (WPA, WPA2, and WPA3) and wired equivalent privacy (WEP) does not require all fragments of a frame are encrypted under the same key. An adversary could exploit this vulnerability to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed.
CVE-2020-24587 has been assigned to this vulnerability. A CVSS v3 base score of 2.6 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).
The 802.11 standard that underpins Wi-Fi protected access (WPA, WPA2, and WPA3) and wired equivalent privacy (WEP) does not require the A-MSDU flag in the plaintext QoS header field be authenticated. Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an adversary could exploit this vulnerability to inject arbitrary network packets.
CVE-2020-24588 has been assigned to this vulnerability. A CVSS v3 base score of 3.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).
An access point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. This might be abused in projected Wi-Fi networks to launch denial-of-service attacks against connected clients and makes it easier to exploit other vulnerabilities in connected clients.
CVE-2020-26139 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
The WEP, WPA, WPA2, and WPA3 implementations accept plaintext frames in a protected Wi-Fi network. An adversary can exploit this vulnerability to inject arbitrary data frames independent of the network configuration.
CVE-2020-26140 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
The Wi-Fi implementation does not verify the message integrity check (authenticity) of fragmented TKIP frames. An adversary can exploit this vulnerability to inject and decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol.
CVE-2020-26141 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
The WEP, WPA, WPA2, and WPA3 implementations treat fragmented frames as full frames. An adversary can exploit this vulnerability to inject arbitrary network packets independent of the network configuration.
CVE-2020-26142 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:N/I:H/A:N).
The WEP, WPA, WPA2, and WPA3 implementations accept fragmented plaintext frames in a protected Wi-Fi network. An adversary can exploit this vulnerability to inject arbitrary data frames independent of the network configuration.
CVE-2020-26143 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
The WEP, WPA, WPA2, and WPA3 implementations accept plaintext A-MSDU frames as long as the first eight bytes correspond to a valid RFC1042 (i.e., LLC/SNAP) header for EAPOL. An adversary can exploit this vulnerability to inject arbitrary network packets independent of the network configuration.
CVE-2020-26144 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
The WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments when sent in plaintext and process them as full unfragmented frames. An adversary can exploit this vulnerability to inject arbitrary network packets independent of the network configuration.
CVE-2020-26145 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
The WPA, WPA2, and WPA3 implementations reassemble fragments with non-consecutive packet numbers. An adversary can exploit this vulnerability to exfiltrate selected fragments. This vulnerability is exploitable when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used. Note: WEP is vulnerable to this attack by design.
CVE-2020-26146 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N).
The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments even though some of them were sent in plaintext. An adversary can exploit this vulnerability to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used.
CVE-2020-26147 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N).
Hitachi ABB Power Grids reported these vulnerabilities to CISA.
Hitachi ABB Power Grids recommends updating to firmware v8.9.4.9 or later, which resolves these vulnerabilities. For additional information on these vulnerabilities, including update instructions, please see the Hitachi ABB Power Grids security advisory.
Hitachi ABB Power Grids has tested and recommends the following mitigation actions, which help block known attack vectors:
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.
These vulnerabilities are not exploitable remotely. No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-24586
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-24587
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-24588
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26139
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26140
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26141
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26142
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26143
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26144
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26145
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26146
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26147
cwe.mitre.org/data/definitions/20.html
cwe.mitre.org/data/definitions/20.html
cwe.mitre.org/data/definitions/20.html
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cwe.mitre.org/data/definitions/287.html
cwe.mitre.org/data/definitions/306.html
cwe.mitre.org/data/definitions/326.html
cwe.mitre.org/data/definitions/354.html
cwe.mitre.org/data/definitions/74.html
cwe.mitre.org/data/definitions/74.html
cwe.mitre.org/data/definitions/74.html
cwe.mitre.org/data/definitions/74.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
search.abb.com/library/Download.aspx?DocumentID=9AKK107992A4463&LanguageCode=en&DocumentPartId=&Action=Launch
twitter.com/CISAgov
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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/ncas/tips/ST04-014
us-cert.cisa.gov/sites/default/files/publications/emailscams_0905.pdf
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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6.5 Medium
CVSS3
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.6 High
AI Score
Confidence
Low
3.3 Low
CVSS2
Access Vector
ADJACENT_NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:A/AC:L/Au:N/C:N/I:P/A:N
0.002 Low
EPSS
Percentile
64.3%