Advantech WebAccess webvrpcs.exe Path Traversal RCE

Critical Nessus Plugin ID 117360

Synopsis

The remote host is running a SCADA application that is affected by a
path traversal vulnerability.

Description

The Advantech WebAccess/SCADA Network Service (webvrpcs.exe) running
on the remote host is affected by a path traversal vulnerability due
to the failure to properly validate user-supplied input when
processing a DCERPC request. An unauthenticated, remote attacker can
exploit this, via a series of crafted requests, to execute arbitrary
code.

Note that this vulnerability is supposedly fixed in WebAccess/SCADA
version 8.3, but it appears that versions 8.3.1 and 8.3.2 are still
vulnerable.

Solution

WebAccess/SCADA version 8.3.3 or later appears to fix the issue.
Contact vendor for confirmation.

See Also

https://ics-cert.us-cert.gov/advisories/ICSA-18-004-02A

https://www.zerodayinitiative.com/advisories/ZDI-18-024/

https://www.exploit-db.com/exploits/44278/

Plugin Details

Severity: Critical

ID: 117360

File Name: scada_advantech_webaccess_cve-2017-16720.nbin

Version: 1.8

Type: remote

Family: SCADA

Published: 2018/09/10

Modified: 2019/01/09

Dependencies: 117361

Risk Information

Risk Factor: Critical

CVSS Score Source: CVE-2017-16720

CVSS v2.0

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS v3.0

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:advantech:webaccess

Exploited by Nessus: true

Vulnerability Publication Date: 2018/01/04

Reference Information

CVE: CVE-2017-16720

BID: 102424

ICSA: 18-004-02A

ZDI: ZDI-18-024

TRA: TRA-2018-23