Advisory Details

December 6th, 2017

Advantech WebAccess webvrpcs drawsrv Untrusted Pointer Dereference Remote Code Execution Vulnerability

ZDI-17-939
ZDI-CAN-4950

CVE ID CVE-2017-12719
CVSS SCORE 6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Advantech
AFFECTED PRODUCTS WebAccess
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 0x2723 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-17-306-02
DISCLOSURE TIMELINE
  • 2017-07-20 - Vulnerability reported to vendor
  • 2017-12-06 - Coordinated public release of advisory
CREDIT Steven Seeley (mr_me) of Offensive Security
BACK TO ADVISORIES