Advisory Details

May 18th, 2018

Advantech WebAccess Node webvrpcs drawsrv Untrusted Pointer Dereference Remote Code Execution Vulnerability

ZDI-18-492
ZDI-CAN-5656

CVE ID CVE-2018-7497
CVSS SCORE 9.3, AV:N/AC:M/Au:N/C:C/I:C/A:C
AFFECTED VENDORS Advantech
AFFECTED PRODUCTS WebAccess Node
VULNERABILITY DETAILS


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 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-18-135-01
DISCLOSURE TIMELINE
  • 2018-02-09 - Vulnerability reported to vendor
  • 2018-05-18 - Coordinated public release of advisory
  • 2018-05-18 - Advisory Updated
CREDIT Steven Seeley (mr_me) of Offensive Security
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