Overview :
In WebAccess versions 8.4.1 and prior, multiple stack based buffer overflow vulnerabilities are detected by a lack of proper validation of the length of user given data. Exploitation of these vulnerabilities will allow remote code execution.
Affected Product(s) :
WebAccess versions 8.4.1
Vulnerability Details :
Code Injection, Command Injection, Stack-based Buffer Overflow, Improper Authorization
CVE ID : CVE-2019-13558
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).
An exploit executed over the network may cause improper control of generation of code, which may allow remote code execution, data exfiltration, or cause a system crash.
CVE ID : CVE-2019-13556
A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Multiple stack-based buffer overflow vulnerabilities are caused by a lack of proper validation of the length of user-supplied data. Exploitation of these vulnerabilities may allow remote code execution.
CVE ID : CVE-2019-13552
A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Multiple command injection vulnerabilities are caused by a lack of proper validation of user-supplied data and may allow arbitrary file deletion and remote code execution.
CVE ID : CVE-2019-13550
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).
An improper authorization vulnerability may allow an attacker to disclose sensitive information, cause improper control of generation of code, which may allow remote code execution or cause a system crash.

Solution : Advantech has released Version 8.4.2 of WebAccessNode to address the reported vulnerabilities. Users can download the latest version of WebAccessNode.