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

ID ZDI-19-329
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 vulnerable installations of Advantech WebAccess Client. Authentication is not required to exploit this vulnerability. The specific flaw exists within a sprintf call in upandpr.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.