Advantech WebAccess Node screnc Stack-based Buffer Overflow Remote Code Execution Vulnerability

2018-05-18T00:00:00
ID ZDI-18-498
Type zdi
Reporter Steven Seeley (mr_me) of Offensive Security
Modified 2018-06-22T00:00:00

Description

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Advantech WebAccess Node. Authentication is not required to exploit this vulnerability. The specific flaw exists within screnc.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 functionality to execute code under the context of Administrator.