Advisory Details

May 8th, 2020

Advantech WebAccess/SCADA BwWebSvc IOCTL 0x00013c80 Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-631
ZDI-CAN-9892

CVE ID CVE-2020-10638
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 processing of IOCTL 0x00013c80 in BwWebSvc.dll. The issue results from the lack of proper validation of user-supplied data, which can trigger an overflow of a fixed-length heap-based buffer. 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
  • 2020-02-18 - Vulnerability reported to vendor
  • 2020-05-08 - Coordinated public release of advisory
CREDIT Z0mb1E
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