Advantech WebAccess webvrpcs drawsrv Untrusted Pointer Dereference Remote Code Execution Vulnerability

December 6th, 2017
ZDI-17-940 ZDI-CAN-4951

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 0x2775 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

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