CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
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
AI Score
Confidence
High
EPSS
Percentile
97.6%
This updated advisory is a follow-up to the original advisory titled ICSA-21-131-14 Siemens SCALANCE W1750D (Update A) that was published August 10, 2021, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code as a privileged user on the underlying operating system, fully compromise the underlying operating system, overwrite sensitive system files, create a denial-of-service condition, execute arbitrary script code in a victim’s browser, read arbitrary files off the underlying file system, create an attacker named directory, corrupt backup files, or obtain sensitive information.
The following versions of SCALANCE W1750D, a software management platform, are affected:
--------- Begin Update B Part 1 of 2 ---------
--------- End Update B Part 1 of 2 ---------
An attacker with physical access to the affected device can bypass authentication mechanisms, which may allow access to the Aruba Instant command line interface.
CVE-2019-5317 has been assigned to this vulnerability. A CVSS v3 base score of 6.8 has been calculated; the CVSS vector string is (AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
An attacker may send specially crafted packets that may allow the execution of arbitrary code as a privileged user on the underlying operating system.
CVE-2019-5319 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
A command injection vulnerability exists in the Aruba Instant command line interface, which may allow an attacker to fully compromise the underlying access point operating system.
CVE-2020-24635 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).
A command injection vulnerability in affected Aruba Instant versions exists, which may allow the execution of arbitrary commands as a privileged user on the underlying operating system.
CVE-2020-24636 has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).
A vulnerability can be exploited through the PAPI protocol, resulting in a system reboot, which may allow an attacker to create a denial-of-service condition.
CVE-2021-25143 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:N/A:H).
An attacker may send specially crafted packets that may allow the execution of arbitrary code as a privileged user on the underlying operating system.
CVE-2021-25144 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
An information disclosure vulnerability exists in affected Aruba Instant access points, which may allow an unauthenticated attacker in the same wired network to access sensitive information.
CVE-2021-25145 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
A command injection vulnerability exists in the Aruba Instant command line interface, which may allow an attacker to fully compromise the underlying access point operating system.
CVE-2021-25146 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).
An attacker may overwrite an arbitrary file with attacker-controlled content via the command line interface, which may allow overwriting of sensitive system files.
CVE-2021-25148 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 attacker may send specially crafted packets that may allow the execution of arbitrary code as a privileged user on the underlying operating system.
CVE-2021-25149 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
A command injection vulnerability exists in the Aruba Instant command line interface, which may allow an attacker to fully compromise the underlying host operating system.
CVE-2021-25150 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 attacker can overwrite an arbitrary file with attacker-controlled content via the web UI that may allow overwriting of sensitive system files.
CVE-2021-25155 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).
An arbitrary directory creation vulnerability exists in affected Aruba Instant hosts, which may allow a directory to be created with the directory name controlled by the attacker.
CVE-2021-25156 has been assigned to this vulnerability. A CVSS v3 base score of 4.9 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N).
An arbitrary file read vulnerability exists in affected Aruba Instant hosts, which may allow an attacker to read any file off the underlying file system, including sensitive system files.
CVE-2021-25157 has been assigned to this vulnerability. A CVSS v3 base score of 4.9 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N).
A race condition in the web UI may allow an attacker to read arbitrary files off the underlying file system, including sensitive system files.
CVE-2021-25158 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
An arbitrary file write vulnerability exists in the affected Aruba Instant using the web interface, which may allow an attacker to overwrite sensitive system files.
CVE-2021-25159 has been assigned to this vulnerability. A CVSS v3 base score of 4.4 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N).
An arbitrary file write vulnerability exists in the Aruba Instant web UI, which may allow an attacker to write arbitrary contents to a single specific backup file and result in the corruption of the backup file.
CVE-2021-25160 has been assigned to this vulnerability. A CVSS v3 base score of 4.9 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N).
An attacker may execute a reflected cross-site scripting attack against a user of the web-based management interface, which may allow an attacker to execute arbitrary script code in a victim’s browser in the context of the affected interface.
CVE-2021-25161 has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).
An unauthenticated command injection vulnerability exists within the Aruba Instant Web UI, which may allow execution of arbitrary commands on the underlying operating system.
CVE-2021-25162 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:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
A vulnerability in the captive portal of Aruba Instant could allow an unauthenticated remote attacker to conduct a reflected cross-site scripting (XSS) attack against another user of the portal. A successful exploit could allow an attacker to execute arbitrary script code in a victim’s browser in the context of the affected interface.
CVE-2021-34617 has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).
An unauthenticated denial-of-service vulnerability exists in affected Aruba Instant access points. Exploitation of this vulnerability is only possible via direct ethernet connection to the access point. This vulnerability can be exploited through the LLPD protocol and could result in the unavailability of the affected access point due to resource exhaustion.
CVE-2021-34618 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:N/A:H).
Siemens reported these vulnerabilities to CISA.
--------- Begin Update B Part 2 of 2 ---------
Siemens recommends upgrading SCALANCE W1750D to v8.7.1.3 or later
--------- End Update B Part 2 of 2 ---------
Siemens has identified the following specific workarounds and mitigations for users to apply to reduce the risk:
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for industrial security and following the recommendations in the product manuals.
For additional information see Siemens Security Advisory SSA-723417
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.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-5317
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-5319
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-24635
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-24636
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25143
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25144
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25145
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25146
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25148
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25149
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25150
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25155
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25156
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25157
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25158
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25159
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25160
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25161
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-25162
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-34617
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-34618
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
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
AI Score
Confidence
High
EPSS
Percentile
97.6%