Advantech WebAccess Client bwclient Stack-based Buffer Overflow Remote Code Execution Vulnerability

ID ZDI-19-620
Type zdi
Reporter Mat Powell of Trend Micro Zero Day Initiative
Modified 2019-06-22T00:00:00


This vulnerability allows remote attackers to execute arbitrary code on affected installations of Advantech WebAccess Client. Authentication is not required to exploit this vulnerability. The specific flaw exists within bwclient.exe, which is accessed through the 0x2711 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 stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of Administrator.