Advantech / BroadWin WebAccess webvrpcs.exe Service Remote Code Execution (uncredentialed check)

This script is Copyright (C) 2011-2015 Tenable Network Security, Inc.


Synopsis :

The remote host is running a service that is affected by remote code
execution and information disclosure vulnerabilities.

Description :

The Advantech / BroadWin WebAccess software installed on the remote
Windows host includes an RPC service (webvrpcs.exe) that listens
remotely on TCP port 4592. It is affected by two vulnerabilities :

- An overflow condition exists due to improper validation
of user-supplied input. An unauthenticated, remote
attacker can exploit this, via a specially crafted
request, to execute arbitrary code.

- An information disclosure vulnerability exists that
allows an unauthenticated, remote attacker to obtain the
security code value that protects the SCADA node via a
long string in an RPC request to TCP port 4592.

See also :

http://www.nessus.org/u?d44f6112
http://archives.neohapsis.com/archives/bugtraq/2011-03/0215.html
https://ics-cert.us-cert.gov/advisories/ICSA-11-094-02B

Solution :

Upgrade to Advantech WebAccess 7.1 2013.05.30 or later.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 10.0
(CVSS2#E:ND/RL:U/RC:ND)
Public Exploit Available : true

Family: SCADA

Nessus Plugin ID: 56995 ()

Bugtraq ID: 47008

CVE ID: CVE-2011-4041