Advantech WebAccess/NMS extProgramAction Unrestricted File Upload Remote Code Execution Vulnerability

ID ZDI-20-386
Type zdi
Reporter rgod of 9sg
Modified 2020-06-22T00:00:00


This vulnerability allows remote attackers to execute arbitrary code on affected installations of Advantech WebAccess/NMS. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of calls to the extProgramAction.action endpoint. When parsing the filename element, the process does not properly validate user-supplied data, which can allow the upload of arbitrary files. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.