Advisory Details

July 2nd, 2019

Advantech WebAccess Node BwPAlarm CreateMonitoredItemEx Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-19-590
ZDI-CAN-8067

CVE ID CVE-2019-10989
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
VULNERABILITY DETAILS

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

The specific flaw exists within the implementation of the 0x11372 IOCTL in the webvrpcs process. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability 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://www.us-cert.gov/ics/advisories/icsa-19-178-05
DISCLOSURE TIMELINE
  • 2019-02-22 - Vulnerability reported to vendor
  • 2019-07-02 - Coordinated public release of advisory
CREDIT Mat Powell of Trend Micro Zero Day Initiative
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