ICS Advisory (ICSA-22-053-03)

WIN-911 2021

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1. EXECUTIVE SUMMARY

  • CVSS v3 5.6
  • ATTENTION: Low attack complexity
  • Vendor: WIN-911
  • Equipment: WIN-911 2021
  • Vulnerabilities: Incorrect Default Permissions

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to leverage the misconfigured privileges to the installed directory and achieve code execution in the application’s context and permissions.

3. TECHNICAL DETAILS

    3.1 AFFECTED PRODUCTS

    The following versions of WIN-911, an alarm notification platform, are affected:

    • WIN-911 2021 R1 – 5.21.10
    • WIN-911 2021 R2 – 5.21.17

    3.2 VULNERABILITY OVERVIEW

    3.2.1    INCORRECT DEFAULT PERMISSIONS CWE-276

    The affected product is vulnerable to a permissions misconfiguration that may allow an attacker to locally write files to the Program Announcer directory and elevate permissions whenever the program is executed.

    CVE-2022-23922 has been assigned to this vulnerability. A CVSS v3 base score of 5.6 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L).

    3.2.2    INCORRECT DEFAULT PERMISSIONS CWE-276

    The affected product is vulnerable to a permissions misconfiguration that may allow an attacker to locally write files to the program Operator Workspace directory, which holds DLL files and executables. A low-privilege attacker could write a malicious DLL file to the Operator Workspace directory to achieve privilege escalation and the permissions of the user running the program.

    CVE-2022-23104 has been assigned to this vulnerability. A CVSS v3 base score of 5.6 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L).

    3.3 BACKGROUND

    • CRITICAL INFRASTRUCTURE SECTORS: Multiple
    • COUNTRIES/AREAS DEPLOYED: Worldwide
    • COMPANY HEADQUARTERS LOCATION: United States

    3.4 RESEARCHER

    Noam Moshe of Claroty reported these vulnerabilities to CISA.

    4. MITIGATIONS

    WIN-911 has released a hotfix that removes write access for the user’s group on the affected directory subfolders. For the hotfix and more information, please use the following link: WIN-911 2021 R1/R2 File Permission Vulnerability.

    CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

    • Ensure the least-privilege user principle is followed.

    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 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 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. These vulnerabilities are not exploitable remotely.


    Contact Information

    For any questions related to this report, please contact the CISA at:

    Email: CISAservicedesk@cisa.dhs.gov
    Toll Free: 1-888-282-0870

    For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
    or incident reporting:  https://us-cert.cisa.gov/report

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