Advantech WebAccess/SCADA ViewSrv IOCTL 0x00002711 Command Injection Remote Code Execution Vulnerability

May 8th, 2020
ZDI-20-595 ZDI-CAN-9905

CVE ID

CVE-2020-12006

CVSS Score

9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Advantech

Affected Products

WebAccess/SCADA

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Advantech WebAccess/SCADA. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of IOCTL 0x00002711 in ViewSrv.dll. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of Administrator.

Additional Details

Advantech has issued an update to correct this vulnerability. More details can be found at:
https://www.us-cert.gov/ics/advisories/icsa-20-128-36

Disclosure Timeline

  • 2020-01-10 - Vulnerability reported to vendor
  • 2020-05-08 - Coordinated public release of advisory

Credit

Z0mb1E

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