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Rewterz Threat Advisory – Multiple Advantech Zero-days

Severity

High

Analysis Summary

CVE-2021-38389

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 0x1138B. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of Administrator.

CVE-2021-33023

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.

Impact

  • Remote Code Execution

Affected Vendors

  • Advantech

Affected Products

  • WebAccess/SCADA

Remediation

Visit the vendor website to update patches:

https://www.cisa.gov/uscert/ics/advisories/icsa-21-285-02