Advisory Details

February 2nd, 2022

Advantech WebAccess IOCTL 0x2722 Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-22-257
ZDI-CAN-12942

CVE ID CVE-2021-33023
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. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of IOCTL 0x2722. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a 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.cisa.gov/uscert/ics/advisories/icsa-21-285-02
DISCLOSURE TIMELINE
  • 2021-06-14 - Vulnerability reported to vendor
  • 2022-02-02 - Coordinated public release of advisory
CREDIT Natnael Samson(@NattiSamson)
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