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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2108 Advisory (icsa-21-161-02) AGG Software Web Server Plugin 11 June 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: AGG Software Web Server Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-32964 CVE-2021-32962 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-161-02 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-161-02) AGG Software Web Server Plugin Original release date: June 10, 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 8.2 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: AGG Software o Equipment: Web Server o Vulnerabilities: Path Traversal, Cross-site Scripting 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow remote code execution and exposure of arbitrary system files. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Web Server may be bundled with any Data Logger: o v4.0.40.1014 and prior (webserver.dll) 3.2 VULNERABILITY OVERVIEW 3.2.1 PATH TRAVERSAL CWE-23 The affected product is vulnerable to a path traversal attack, which may allow an attacker to read arbitrary files from the file system. CVE-2021-32964 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:L/I:L/A:N ). 3.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE SCRIPTING') CWE-79 The affected product is vulnerable to cross-site scripting, which may allow an attacker to remotely execute arbitrary code. CVE-2021-32962 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:L/I:H/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Canada 3.4 RESEARCHER Michael Heinzl reported these vulnerabilities to CISA. 4. MITIGATIONS AGG recommends Web Server plugin users to update to 4.0.42 Build 512 or later . This plugin may be bundled with any of AGG data loggers. CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its 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 iQIVAwUBYMLjl+NLKJtyKPYoAQgqDRAAi7SRaU/OIDtyLbGk6yOJvVMHWuAyjuLY pDB2Z9ToeEzqjoDpq3RgG51r3KewT4C0FST/8xEy4NtlCn4a/2sf5uxrtxnfb6gk /6ivJnBmpjhv8m4Vm5cIzuiSIKQ/Ho3JZy93NRow6Q4lvdeQgcooP1KwelF5zFNZ IYJ+bclK8ZZYY9AJRSGGn7iCQ97GQ83ew7sD6Qgj8in3Vl63gRGI4+FZGHPbwh+W x7aufN1n43q4u+uVSBl+F/AGD+UsZODvk5STKgitSbJu756Drt6wtJBieydgHG9f 4wLdR0KZrRYyMv8XCZw5WEIGs9zzC34KdBoJvEGW1Q/dBjJTARpBV3F8R0Mungr/ g31N67yVnKY/5qtYf43aquj95sd7ttgXpf8iN64COXwUbHulnFFdAZsOXCYmw24n SIMPOhJEPEfc6fAwISxvrJRKsmizkPGJre+2fFh6Rf1T0t0sjOX15qs7Iy3eOyTY et+tIEokURDNFleLL/E7VH4LXU5e3U4jPsijdMQTruLgabzEzls890pqqOxZTLE0 Od5RqgedETXYopHv4xc4THB64/kxvteCxexTdZ2YEhV1jKe6znmkqZwJLFEH8bQt cUiS5NKzq5C5F+I6j7GmjshUqh+/u+KOGJUHkmK/6MQbgZbJroXPYctIut94WtqT G2jBetLPxmc= =gaS3 -----END PGP SIGNATURE-----