Advisory Details

January 5th, 2018

Advantech WebAccess cnvlgxtag Untrusted Pointer Dereference Remote Code Execution Vulnerability

ZDI-18-059
ZDI-CAN-5062

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.

VENDOR RESPONSE 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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