ZDI-20-626: Advantech WebAccess/SCADA ViewSrv IOCTL 0x0000277d Directory Traversal Remote Code Execution Vulnerability

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.

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• collector/zdi-advisory
• source/ZDI
• alias/ZDI-20-626
• alias/ZDI-CAN-9907
• alias/CVE-2020-12026
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• vendor/advantech
• canonical/advantech webaccess/scada