Advisory Details

December 6th, 2017

Advantech WebAccess webvrpcs ViewDll1 Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2017-14016
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 implementation of the 0x138bd 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.
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	2017-07-19 - Vulnerability reported to vendor 2017-12-06 - Coordinated public release of advisory
CREDIT	Steven Seeley (mr_me) of Offensive Security

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