Advisory Details

February 5th, 2016

Advantech WebAccess webvrpcs Service ViewSrv.dll Path BwBuildPath Stack-Based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2016-0856
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 ['21138']. 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 instances of Advantech WebAccess. Authentication is not required to exploit this vulnerability. The specific flaw exists within the implementation of the 0x27B2 IOCTL in the ViewSrv subsystem. A stack-based buffer overflow vulnerability exists in a call to BwBuildPath. An attacker can use this vulnerability to execute arbitrary code in the context of an administrator of the system.
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-16-014-01
DISCLOSURE TIMELINE	2015-09-17 - Vulnerability reported to vendor 2016-02-05 - Coordinated public release of advisory
CREDIT	Anonymous

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