Advisory Details

May 18th, 2018

Advantech WebAccess webvrpcs Service viewdll1 strcpy Heap-Based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2018-8845
CVSS SCORE	9.3, AV:N/AC:M/Au:N/C:C/I:C/A:C
AFFECTED VENDORS	Advantech
AFFECTED PRODUCTS	WebAccess
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 0x13C80 IOCTL in the BwOpcTool subsystem. When parsing the NamedObject structure, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length, heap-based buffer. An attacker can leverage this vulnerability to execute code in 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	2018-03-23 - Vulnerability reported to vendor 2018-05-18 - Coordinated public release of advisory 2018-05-18 - Advisory Updated
CREDIT	Fritz Sands of the Zero Day Initiative

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