Advisory Details

January 5th, 2018

Advantech WebAccess cnvlgxtag Untrusted Pointer Dereference Remote Code Execution Vulnerability

CVE ID	CVE-2017-16728
CVSS SCORE	9.3, AV:N/AC:M/Au:N/C:C/I:C/A:C
AFFECTED VENDORS	Advantech
AFFECTED PRODUCTS	WebAccess
TREND MICRO CUSTOMER PROTECTION	Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID ['29657']. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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 parsing of the command line in the cnvlgxtag utility. 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	2017-08-04 - Vulnerability reported to vendor 2018-01-05 - Coordinated public release of advisory
CREDIT	Steven Seeley (mr_me) of Offensive Security

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