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AUSCERT External Security Bulletin Redistribution
ESB-2013.1050
GE Proficy HMI/SCADA CIMPLICITY WebView Improper Input Validation
1 August 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: GE Proficy HMI/SCADA CIMPLICITY
Publisher: US-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-2785
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-13-170-01
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ICS-CERT ADVISORY
Advisory (ICSA-13-170-01)
GE Proficy HMI/SCADA CIMPLICITY WebView Improper Input Validation
Original release date: July 30, 2013
OVERVIEW
Independent researchers ZombiE and amisto0x07 have identified an improper input
validation vulnerability in the GE CIMPLICITY WebView application. GE has
produced an update that mitigates this vulnerability.
GE has released a security advisory (GEIP13-03) available on the GE Intelligent
Platforms support Web site to inform customers about this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
The following GE CIMPLICITY versions are affected:
Proficy HMI/SCADA - CIMPLICITY: Version 4.01 to 8.2, and
Proficy Process Systems with CIMPLICITY.
IMPACT
If the vulnerability is exploited, it could allow an unauthenticated remote
attacker to cause the CIMPLICITY WebView and/or CIMPLITY built-in Web server to
crash, or to run arbitrary commands on a server running the affected software,
or could potentially allow an attacker to take control of the CIMPLICITY server.
An attacker can exploit the vulnerability by sending malicious messages over a
TCP connection to the listening service. The attacks do not require
authentication and can be conducted remotely. The vulnerable components are not
enabled by default.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of these vulnerabilities based on their operational environment, architecture,
and product implementation.
BACKGROUND
According to GE, Proficy HMI/SCADA-CIMPLICITY is a Client/Server-based
human-machine interface/supervisory control and data acquisition (HMI/SCADA)
application, which is deployed across multiple industries.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
IMPROPER INPUT VALIDATIONa
The CimWebServer does not properly validate inputted information. By sending a
specially crafted packet, an attacker could crash the WebView or built-in Web
server, run arbitrary commands on a server running the affected software, or
take control of the server. The vulnerable CIMPLICITY built-in Web server
component is not enabled by default.
CVE-2013-2785b has been assigned to this vulnerability. A CVSS v2 base score of
8.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:C/A:C).c
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a medium skill would be able to exploit this vulnerability.
MITIGATION
GE has released the following product updates that resolve this vulnerability:
Proficy HMI/SCADA - CIMPLICITY 8.2 SIM 19
Proficy HMI/SCADA - CIMPLICITY 8.1 SIM 25
Proficy HMI/SCADA - CIMPLICITY 8.0 SIM 27
All the updates can be found at:
http://support.ge-ip.com/support/index?page=kbchannel&id=KB15602
ICS-CERT encourages asset owners to take additional defensive measures to
protect against this and other cybersecurity risks.
Minimize network exposure for all control system devices. Critical devices
should not directly face the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPN is only as secure as the connected
devices.
ICS-CERT also provides a section for control systems security recommended
practices on the ICS-CERT Web page. Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategiesd ICS-CERT reminds organizations
to perform proper impact analysis and risk assessment prior to taking defensive
measures.
Additional mitigation guidance and recommended practices are publicly available
in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B-Targeted Cyber
Intrusion Detection and Mitigation Strategiese, that is available for download
from the ICS-CERT Web page (http://ics-cert.us-cert.gov/).
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.
a. CWE-20: Improper Input Validation,
http://cwe.mitre.org/data/definitions/20.html,
Web site last accessed July 30, 2013.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-2785,
NIST uses this advisory to create the CVE Web site report. This Web site
will be active sometime after publication of this advisory.
c. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:C/A:C,
Web site last accessed July 30, 2013.
d. CSSP Recommended Practices,
http://ics-cert.us-cert.gov/content/recommended-practices,
Web site last accessed July 30, 2013.
e. Targeted Cyber Intrusion Detection and Mitigation Strategies,
http://ics-cert.us-cert.gov/tips/ICS-TIP-12-146-01B, Web site last
accessed July 30, 2013.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
ICS-CERT continuously strives to improve its products and services. You can
help by answering a short series of questions about this product at the
following URL: https://forms.us-cert.gov/ncsd-feedback/.
Legal
For Legal Information pertaining to this document, please consult
http://ics-cert.us-cert.gov/Legal-Disclaimer
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