Advisory Details

May 8th, 2020

Advantech WebAccess/SCADA ViewSrv IOCTL 0x0000277d Directory Traversal Remote Code Execution Vulnerability

ZDI-20-626
ZDI-CAN-9907

CVE ID CVE-2020-12026
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 vulnerable installations of Advantech WebAccess/SCADA. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of IOCTL 0x0000277d in ViewSrv.dll. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. 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
  • 2019-12-27 - Vulnerability reported to vendor
  • 2020-05-08 - Coordinated public release of advisory
CREDIT Z0mb1E
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