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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3796.2 Advisory (icsa-20-308-03) ARC Informatique PcVue 6 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ARC Informatique PcVue Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-26869 CVE-2020-26868 CVE-2020-26867 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-20-308-03 Revision History: January 6 2021: Additional upgrade instructions added to advisory November 4 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-308-03) ARC Informatique PcVue (Update A) Original release date: January 05, 2021 Legal Notice All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 9.8 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: ARC Informatique o Equipment: PcVue o Vulnerabilities: Deserialization of Untrusted Data, Access to Critical Private Variable via Public Method, Information Exposure of Sensitive Information to an Unauthorized Actor 2. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-20-308-03 ARC Informatique PcVue that was published November 3, 2020, on the ICS webpage on us-cert.cisa.gov. 3. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code, expose sensitive data, and prevent legitimate users from connecting to PcVue services. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS The following versions of PcVue are affected: o PcVue Versions 8.10 to versions prior to 12.0.17 4.2 VULNERABILITY OVERVIEW 4.2.1 DESERIALIZATION OF UNTRUSTED DATA CWE-502 The affected product is vulnerable due to the deserialization of untrusted data, which may allow an attacker to remotely execute arbitrary code on the web and mobile back-end server. CVE-2020-26867 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 ). 4.2.2 ACCESS TO CRITICAL PRIVATE VARIABLE VIA PUBLIC METHOD CWE-767 The affected product is vulnerable to a denial-of-service attack due to the ability of an unauthorized user to modify information used to validate messages sent by legitimate web clients. This issue also affects third-party systems based on the Web Services Toolkit. CVE-2020-26868 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 ). 4.2.3 INFORMATION EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200 The affected product is vulnerable to information exposure, allowing unauthorized users to access session data of legitimate users. This issue also affects third-party systems based on the Web Services Toolkit. CVE-2020-26869 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 ). 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: France 4.4 RESEARCHER Sergey Temnikov and Andrey Muravitsky of Kaspersky Lab reported these vulnerabilities to ARC Informatique. 5. MITIGATIONS - --------- Begin Update A Part 1 of 1 --------- ARC Informatique recommends upgrading PcVue to v12.0.17. Contact PcVue Support to receive instructions on downloading and installing the latest software version. Patches are available for Version 12 (12.0.17 Maintenance Release) and Version 11.2 (11.2.06097 Update). The following mitigations and workarounds have been identified by ARC Informatique to help reduce risk: o Uninstall the web and mobile backend. Users not using the affected components should uninstall them. If the components are not required, do not install them. o Harden firewall configuration by ensuring that incoming connections on the corresponding port are authorized only if initiated by the IIS Web Server process. The listening port is configurable (default 8090) and may have been changed on the system using the Application Explorer. - --------- End Update A Part 1 of 1 --------- For more information on this issue, please see Security Bulletin 2020-1 on the ARC Informatique security page . CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet . o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices. 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. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX/Ub2eNLKJtyKPYoAQhtUw//cc3vqRBG50Ec3so/3p0NK8GQDdv5r906 mvRhuNaBrSP2c8dskLp8RxO83lYxRid4n9MebV9aX2Zq/u/WsxV+yqie1k5JViXq tdk5ATSRFbDocFuOp+tAZgmmIrNbeTJKp/BvQg0lmInenIU7p1oxdJSHHcn2rPQW G4KaB8kCXxf1MxCUrrdpgwiOiwwA2VEdyfrR60bifquLGBD7ag7T4CXfRL3SGpi2 UccJeghLQv0PK0UUIPmPiK9mVtFE5E+uGDLqRwsYybhM5uIx5KPVuIXm7e1fON/u U7cbOBO9bOI20KfZh2yf2BqaMiEkv3h31oryhgXLqGrSOEryf8NqS7miRONyk7mR v9OKGJ+yqp1t1r6TfO3bAloM7L1JEPMXB5W4nsPXbkEQ3TACb9p7MMARqb4VgYQA t+lN56hZKeLvZFlWBwbnaTrXSJl8Ruy3Di1CP8CAsd9ySxJxlusug6iXZndpmaRw fJbAuUFU1ICU1e+UKz4y+3r0nMlCPqMjEBNO5YF4Vh7wKwidYFmClPoTBFXOrOY2 mpl9fYmKllnl3P+wgdgmT1KLVyNcTGVdtzIlbIo1r6c5BJHyOr41+KuI6t001NcQ CYzMc6YNi0YSCBEodxP0/+YdmzJoDOk0wKx+O7tWPN47wSblqVG7t9yiB9doWIlV vSzVSsrT0x0= =unQB -----END PGP SIGNATURE-----