Advantech WebAccess webvrpcs drawsrv SQLPrepare Untrusted Pointer Dereference Remote Code Execution Vulnerability
Vulnerability Details
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Advantech WebAccess. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the implementation of the 0x27e5 IOCTL in the webvrpcs process. The issue results from the lack of proper validation of a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this functionality to execute code under the context of Administrator.
Additional Details
Advantech has issued an update to correct this vulnerability. More details can be found at:
https://ics-cert.us-cert.gov/advisories/ICSA-18-004-02
Disclosure Timeline
- 2017-07-28 - Vulnerability reported to vendor
- 2018-01-05 - Coordinated public release of advisory
Credit
Steven Seeley (mr_me) of Offensive Security
