Advantech WebAccess Node

# ICS Advisory (ICSA-20-128-01) ## Advantech WebAccess Node Original release date: May 07, 2020 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-128-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-128-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-128-01) ### Legal Notice All information products included in [https://us-cert.gov/ics](/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://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 9.8** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** Advantech * **Equipment:** WebAccess Node * **Vulnerabilities:** Improper Validation of Array Index, Relative Path Traversal, SQL Injection, Stack-based Buffer Overflow, Heap-based Buffer Overflow, Out-of-bounds Read ## 2\. RISK EVALUATION Successful exploitation of these vulnerabilities may allow information disclosure, remote code execution, and compromise system availability. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following versions of WebAccess Node, an HMI platform, are affected: * WebAccess Node Version 8.4.4 and prior * WebAccess Node Version 9.0.0 ### 3.2 VULNERABILITY OVERVIEW #### 3.2.1 [IMPROPER VALIDATION OF ARRAY INDEX CWE-129](https://cwe.mitre.org/data/definitions/129.html) An improper validation vulnerability exists that could allow an attacker to inject specially crafted input into memory where it can be executed. [CVE-2020-12022](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12022) 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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)). #### 3.2.2 [RELATIVE PATH TRAVERSAL CWE-23](https://cwe.mitre.org/data/definitions/23.html) Multiple relative path traversal vulnerabilities exist that may allow an authenticated user to use a specially crafted file to delete files outside the application's control. [CVE-2020-12010](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12010) has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H)). #### 3.2.3 [RELATIVE PATH TRAVERSAL CWE-23](https://cwe.mitre.org/data/definitions/23.html) Multiple relative path traversal vulnerabilities exist that may allow an attacker to overwrite files outside the application's control. [CVE-2020-12006](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12006) 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:N/UI:R/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)). #### 3.2.4 [RELATIVE PATH TRAVERSAL CWE-23](https://cwe.mitre.org/data/definitions/23.html) Multiple relative path traversal vulnerabilities exist that may allow a low privilege user to overwrite files outside the application's control. [CVE-2020-12026](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12026) has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H)). #### 3.2.5 [IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL INJECTION') CWE-89](https://cwe.mitre.org/data/definitions/89.html) Input is not properly sanitized and may allow an attacker to inject SQL commands. [CVE-2020-12014](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12014) 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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)). #### 3.2.6 [STACK-BASED BUFFER OVERFLOW CWE-121](https://cwe.mitre.org/data/definitions/121.html) Multiple stack-based buffer overflow vulnerabilities exist caused by a lack of proper validation of the length of user-supplied data, which may allow remote code execution. [CVE-2020-12002](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12002) 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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)). #### 3.2.7 [HEAP-BASED BUFFER OVERFLOW CWE-122](https://cwe.mitre.org/data/definitions/122.html) Multiple heap-based buffer overflow vulnerabilities exist caused by a lack of proper validation of the length of user-supplied data, which may allow remote code execution. [CVE-2020-10638](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-10638) 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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)). #### 3.2.8 [OUT-OF-BOUNDS READ CWE-125](https://cwe.mitre.org/data/definitions/125.html) An out-of-bounds vulnerability exists that may allow access to unauthorized data. [CVE-2020-12018](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12018) 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:L/UI:N/S:U/C:H/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Critical Manufacturing, Energy, Water and Wastewater Systems * **COUNTRIES/AREAS DEPLOYED:** East Asia, United States, Europe * **COMPANY HEADQUARTERS LOCATION:** Taiwan ### 3.4 RESEARCHER Natnael Samson and Z0mb1E, working with Trend Micro's Zero Day Initiative, reported these vulnerabilities to CISA. ## 4\. MITIGATIONS Advantech has released WebAccessNode [Version 8.4.4.P0320844](https://support.advantech.com/support/DownloadSRDetail_New.aspx?SR_ID=1-MS9MJV&Doc_Source=Download) to address the reported vulnerabilities for users currently using WebAccessNode Version 8.4.4 Advantech has released WebAccessNode [Version 9.0.0.P0320900](https://support.advantech.com/support/DownloadSRDetail_New.aspx?SR_ID=1-MS9MJV&Doc_Source=Download) to address the reported vulnerabilities for users currently using WebAccessNode Version 9.0.0 **Note:** Upon installation, there is a step to let the user decide whether to define a password code for RPC calls. If the user leaves this blank, the installation will pop up a warning to the user for potential risks that they are willing to take. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: * Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](https://www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01). * Locate control system networks and remote devices behind firewalls, and isolate them from the business network. * 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](https://www.us-cert.gov/ics/recommended-practices) on the ICS webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies](https://www.us- cert.gov/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS- TIP-12-146-01B). 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: * Do not click web links or open unsolicited attachments in email messages. * Refer to [Recognizing and Avoiding Email Scams](https://www.us-cert.gov/sites/default/files/publications/emailscams_0905.pdf) for more information on avoiding email scams. * Refer to [Avoiding Social Engineering and Phishing Attacks](https://www.us-cert.gov/ncas/tips/ST04-014) for more information on social engineering attacks. No known public exploits specifically target these vulnerabilities.