1. EXECUTIVE SUMMARY CVSS v3 7.5 ATTENTION:  Exploitable remotely/low attack complexity Vendor:  Mitsubishi Electric Equipment:  WS0-GETH00200 Vulnerabilities:  Active Debug Code 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to bypass authentication and log in by connecting to the module via telnet to reset the module or, if certain conditions are met, either disclose or tamper with the module’s configuration, or rewrite the firmware. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Mitsubishi Electric MELSEC WS Series, an ethernet interface module, are affected: WS0-GETH00200: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 ACTIVE DEBUG CODE CWE-489 In the affected products, the hidden telnet function is enabled by default when shipped from the factory. An authentication bypass vulnerability could allow a remote unauthenticated attacker to log into the affected module by connecting to it via telnet. CVE-2023-1618 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 ). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS:  Critical Manufacturing COUNTRIES/AREAS DEPLOYED:  Worldwide COMPANY HEADQUARTERS LOCATION:  Japan 3.4 RESEARCHER Mitsubishi Electric reported this vulnerability to CISA. 4. MITIGATIONS Mitsubishi Electric has released the following mitigations/workarounds: Set password for telnet sessions that are difficult for third parties to guess. The password can be up to 15 characters long. Note that “[space]” in the input string represents a single-byte space. Users can change the password for the telnet session of the affected product by using the telnet client and performing: Password setting: Enter “telnet[space]” followed by the IP address of the affected product and press the Enter key. When “Password” is displayed, press the Enter key without entering anything. When “telnet>” is displayed, enter “password[space]” followed by the desired password string and press the Enter key. Enter “quit” and press the Enter key. Confirm the password is set: After the Password setting process, enter “telnet[space]” followed by the IP address of the affected product and press the Enter key. When “Password” is displayed, enter the password string set in the Password setting process and press the Enter key. If “telnet>” is displayed, the password is set correctly. Enter “quit” and press the Enter key. Alternatively, Mitsubishi Electric recommends that users take the following mitigation measures to minimize the risk of exploiting this vulnerability: Use a firewall, virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required. Use product within a local area network (LAN) and use firewalls to block access from untrusted networks and hosts. Restrict physical access to prevent untrusted devices from connecting to the LAN. For more information, see Mitsubishi Electric’s Security Advisory . CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 at cisa.gov/ics . Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability.CISAraw:686afbfd93841e15b08f5d69372e8cda – 2023-05-19T15:19:23.000Z

May 19, 2023Elle CeeDee

Cybersecurity
1. EXECUTIVE SUMMARY

CVSS v3 7.5

ATTENTION:  Exploitable remotely/low attack complexity

Vendor:  Mitsubishi Electric

Equipment:  WS0-GETH00200

Vulnerabilities:  Active Debug Code

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to bypass authentication and log in by connecting to the module via telnet to reset the module or, if certain conditions are met, either disclose or tamper with the module’s configuration, or rewrite the firmware.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Mitsubishi Electric MELSEC WS Series, an ethernet interface module, are affected:

WS0-GETH00200: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 ACTIVE DEBUG CODE CWE-489

In the affected products, the hidden telnet function is enabled by default when shipped from the factory. An authentication bypass vulnerability could allow a remote unauthenticated attacker to log into the affected module by connecting to it via telnet.

CVE-2023-1618 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 ).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS:  Critical Manufacturing

COUNTRIES/AREAS DEPLOYED:  Worldwide

COMPANY HEADQUARTERS LOCATION:  Japan

3.4 RESEARCHER

Mitsubishi Electric reported this vulnerability to CISA.

4. MITIGATIONS

Mitsubishi Electric has released the following mitigations/workarounds:

Set password for telnet sessions that are difficult for third parties to guess. The password can be up to 15 characters long. Note that “[space]” in the input string represents a single-byte space. Users can change the password for the telnet session of the affected product by using the telnet client and performing:

Password setting:

Enter “telnet[space]” followed by the IP address of the affected product and press the Enter key.

When “Password” is displayed, press the Enter key without entering anything.

When “telnet>” is displayed, enter “password[space]” followed by the desired password string and press the Enter key.

Enter “quit” and press the Enter key.

Confirm the password is set:

After the Password setting process, enter “telnet[space]” followed by the IP address of the affected product and press the Enter key.

When “Password” is displayed, enter the password string set in the Password setting process and press the Enter key.

If “telnet>” is displayed, the password is set correctly.

Enter “quit” and press the Enter key.

Alternatively, Mitsubishi Electric recommends that users take the following mitigation measures to minimize the risk of exploiting this vulnerability:

Use a firewall, virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.

Use product within a local area network (LAN) and use firewalls to block access from untrusted networks and hosts.

Restrict physical access to prevent untrusted devices from connecting to the LAN.

For more information, see Mitsubishi Electric’s Security Advisory .

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 at cisa.gov/ics . Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies .

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploits specifically target this vulnerability.CISAraw:686afbfd93841e15b08f5d69372e8cdaCISAThu, 18 May 23 12:00:00 +0000

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CISA has added one new vulnerability to its Known Exploited Vulnerabilities Catalog , based on evidence of active exploitation. CVE-2023-2 868  Barracuda Networks ESG Appliance Improper Input Validation Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Note:  To view other newly added vulnerabilities in the catalog, click on the arrow in the “Date Added to Catalog” column—which will sort by descending dates. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities  established the Known Exploited Vulnerabilities Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the  BOD 22-01 Fact Sheet  for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of Catalog vulnerabilities  as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . This product is provided subject to this Notification  and this Privacy & Use  policy.CISAraw:c10caedb098110c81742083ca1bb7557 – 2023-05-30T12:15:47.000Z
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CISA has added one new vulnerability to its Known Exploited Vulnerabilities Catalog , based on evidence of active exploitation. CVE-2023-2 868  Barracuda Networks ESG Appliance Improper Input Validation Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Note:  To view other newly added vulnerabilities in the catalog, click on the arrow in the “Date Added to Catalog” column—which will sort by descending dates. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities  established the Known Exploited Vulnerabilities Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the  BOD 22-01 Fact Sheet  for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of Catalog vulnerabilities  as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . This product is provided subject to this Notification  and this Privacy & Use  policy.CISAraw:750720923d0bad309449ad3f150687d9 – 2023-05-26T17:30:31.000Z
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CISA released one Industrial Control Systems (ICS) advisory on May 25, 2023. This advisory provides timely information about current security issues, vulnerabilities, and exploits surrounding ICS. ICSA-23-145-01 Moxa MXsecurity Series CISA encourages users and administrators to review the newly released ICS advisory for technical details and mitigations.CISAraw:749c5fdcaa51e1bbc4192b9637bc2f11 – 2023-05-25T15:25:10.000Z
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