6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
49.3%
Successful exploitation of these vulnerabilities by an authenticated user can allow root level arbitrary write permission, which can lead to remote code execution.
The following versions of Emerson WirelessHART Gateway network communication devices are affected:
The affected product is vulnerable to a missing permission validation on system backup restore, which could lead to account take over and unapproved settings change.
CVE-2021-42539 has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
The affected product is vulnerable to improper input validation in the restore file. This enables an attacker to provide malicious config files to replace any file on disk.
CVE-2021-38485 has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
The affected product is vulnerable to directory traversal due to mishandling of provided backup folder structure.
CVE-2021-42542 has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
The affected product is vulnerable to a unsanitized extract folder for system configuration. A low-privileged user can leverage this logic to overwrite the settings and other key functionality.
CVE-2021-42540 has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
The affected product is vulnerable to a parameter injection via passphrase, which enables the attacker to supply uncontrolled input.
CVE-2021-42538 has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
The affected product is vulnerable to a disclosure of peer username and password by allowing all users access to read global variables.
CVE-2021-42536 has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
Amir Preminger of Claroty reported these vulnerabilities to CISA.
Emerson recommends upgrading to v4.7.105 to address these vulnerabilities.
Users can visit the Emerson Gate Firmware site for and download instructions.
If affected users do not yet have a free Guardian account, please see the updated Emerson Gateway Firmware download process by following the link above and viewing the download guide.
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 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-2021-38485
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42536
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42538
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42539
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42540
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42542
cwe.mitre.org/data/definitions/123.html
cwe.mitre.org/data/definitions/20.html
cwe.mitre.org/data/definitions/200.html
cwe.mitre.org/data/definitions/22.html
cwe.mitre.org/data/definitions/306.html
cwe.mitre.org/data/definitions/78.html
go.emersonautomation.com/rmt-en-w-wireless-gateway-firmware?utm_source=rmt_us-elqw-gf_arop&utm_medium=mixe&utm_content=upgrade_dl&utm_campaign=20grmtw-gateway_firmware01
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twitter.com/CISAgov
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us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
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.dhs.gov
www.dhs.gov/foia
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
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mailto:?subject=Emerson%20WirelessHART%20Gateway&body=www.cisa.gov/news-events/ics-advisories/icsa-21-278-02
6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
49.3%