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 High
AI Score
Confidence
Low
0.004 Low
EPSS
Percentile
74.7%
Successful exploitation of these vulnerabilities could allow an attacker to obtain sensitive information, modify configuration, or affect the availability of the device.
The following versions of Emersonβs Rosemount X-STREAM gas analysis software, are affected:
The affected products utilize a weak encryption algorithm for storage of sensitive data, which may allow an attacker to more easily obtain credentials used for access.
CVE-2021-27457 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).
The webserver of the affected products allows unvalidated files to be uploaded, which an attacker could utilize to execute arbitrary code.
CVE-2021-27459 has been assigned to this vulnerability. A CVSS v3 base score of 7.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N).
The affected webserver applications allow access to stored data that can be obtained by using specially crafted URLs.
CVE-2021-27461 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).
The affected applications utilize persistent cookies where the session cookie attribute is not properly invalidated, allowing an attacker to intercept the cookies and gain access to sensitive information.
CVE-2021-27463 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
The affected applications do not validate webpage input, which could allow an attacker to inject arbitrary HTML code into a webpage. This would allow an attacker to modify the page and display incorrect or undesirable data.
CVE-2021-27465 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).
The affected productβs web interface allows an attacker to route click or keystroke to another page provided by the attacker to gain unauthorized access to sensitive information.
CVE-2021-27467 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N).
Emerson reported these vulnerabilities to CISA.
Emerson recommends users update the firmware of the affected products. A new release that addresses the issues identified in this cybersecurity notification impacting the affected products is available. For information on how to obtain the update, contact [email protected]
In addition, Emerson recommends users of affected products continue to utilize current cybersecurity industry best practices and ensure the affected products are connected to a well-protected network and properly segmented from the Internet. For more information see the Emerson Security notifications page.
One of the cybersecurity best practices should include configuring web browsers to prohibit storage of user information such as login names and passwords.
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-12-146-01BβTargeted 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-2021-27457
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27459
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27461
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27463
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27465
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27467
cwe.mitre.org/data/definitions/1021.html
cwe.mitre.org/data/definitions/22.html
cwe.mitre.org/data/definitions/326.html
cwe.mitre.org/data/definitions/434.html
cwe.mitre.org/data/definitions/539.html
cwe.mitre.org/data/definitions/79.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Emerson%20Rosemount%20X-STREAM+https://www.cisa.gov/news-events/ics-advisories/icsa-21-138-01
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
www.dhs.gov/performance-financial-reports
www.emerson.com/en-us/support/security-notifications
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-21-138-01&title=Emerson%20Rosemount%20X-STREAM
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
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mailto:?subject=Emerson%20Rosemount%20X-STREAM&body=www.cisa.gov/news-events/ics-advisories/icsa-21-138-01
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 High
AI Score
Confidence
Low
0.004 Low
EPSS
Percentile
74.7%