Advantech WebAccess webvrpcs Command Injection Remote Code Execution Vulnerability

October 24th, 2018
ZDI-18-1301 ZDI-CAN-6288

CVE ID

CVE-2018-14806

CVSS Score

10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected Vendors

Advantech

Affected Products

WebAccess Node

Vulnerability Details


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

The specific flaw exists within the implementation of the 0x2711 IOCTL in the webvrpcs process. 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 functionality to execute code under the context of Administrator.

Additional Details

Advantech has issued an update to correct this vulnerability. More details can be found at:
https://ics-cert.us-cert.gov/advisories/ICSA-18-296-01

Disclosure Timeline

  • 2018-05-29 - Vulnerability reported to vendor
  • 2018-10-24 - Coordinated public release of advisory
  • 2018-10-24 - Advisory Updated

Credit

Mat Powell of Trend Micro Zero Day Initiative

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