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AUSCERT External Security Bulletin Redistribution
ESB-2013.0218
Schneider Electric Accutech Manager Heap Overflow
18 February 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric Accutech Manager
Publisher: US-CERT
Operating System: Windows
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-0658
Original Bulletin:
http://ics-cert.us-cert.gov/pdf/ICSA-13-043-01.pdf
Comment: Exploit code for a remotely exploitable administrator compromise has
been made publicly available. A patch is available from the vendor.
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ICS-CERT ADVISORY
ICSA-13-043-01-SCHNEIDER ELECTRIC ACCUTECH MANAGER HEAP OVERFLOW
February 12, 2013
OVERVIEW
This advisory provides mitigation details for a vulnerability that impacts the
Schneider Electric Accutech Manager.
Independent researcher Aaron Portnoy of Exodus Intelligence [a] has identified
a heap-based buffer overflow vulnerability in Schneider Electric's Accutech
Manager application. Schneider Electric has produced an update that mitigates
this vulnerability. This researcher has tested the update and verified that it
fixes the vulnerability. Exploitation of this vulnerability could allow an
attacker to execute code with administrator privileges. This vulnerability
could affect the energy, water and wastewater, and critical manufacturing
sectors.
This vulnerability could be exploited remotely.
Exploit code for this vulnerability has recently been published by another
researcher who was not part of any coordinated effort with the vendor,
ICS-CERT, or Exodus Intelligence.
Affected Products
The following Schneider Electric versions are affected:
* Accutech Manager 2.00.1 and older.
Impact
This buffer overflow will cause the Accutech Manager application to crash and
could be exploited to allow an attacker to execute arbitrary code with
administrator privilege. Because this vulnerability can be exploited remotely,
there is a potential for an attacker to gain control of the host computer.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of this vulnerability based on their operational environment, architecture,
and product implementation.
Background
Schneider Electric is a Europe-based company that maintains offices in 190
countries worldwide. Their products address various markets including
renewable energy, process control, monitoring and control, motor controls,
lighting controls, electrical distribution, and security systems.
The affected product, Accutech Manager, is a management component of a network-
based sensor monitoring system. Accutech Manager is used in applications where
remote sensor data are gathered, monitored, displayed, and archived over time.
It can be used in a broad range of low-level applications ranging from long-
term multi-sensor monitoring on a large network to single PC implementations
for technicians.
According to Schneider Electric, Accutech Manager is deployed across several
sectors including energy, water and wastewater, and critical manufacturing.
VULNERABILITY CHARACTERISATION
Vulnerability Overview
Heap-Based Buffer Overflow [b]
The RFManagerService.exe process binds to Ports 2536/TCP and 2537/TCP by
default. By sending an HTTP request outside the bounds of the buffer to Port
2537/TCP, an attacker can cause a heap-based buffer resulting in loss of
confidentiality, integrity, and availability.
CVE-2013-0658 [c] has been assigned to this vulnerability. ICS-CERT has
assigned a base CVSS score of 10.0; the CVSS vector string is:
(AV:N/AC:L/Au:N/C:C/I:C/A:C). [d]
Vulnerability Details
Exploitability
This vulnerability could be exploited remotely.
Existence of Exploit
Exploit code for this vulnerability has been recently published.
Difficulty
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
Schneider Electric has released an update [e] that mitigates this
vulnerability. The researcher has tested the update and verified that it fixes
the vulnerability.
This update is available at the Schneider Electric Website:
http://www.schneider-electric.com/download/ww/en/results/0/1555898-Software--Released/28460036-Accutech/
Schneider Electric also recommends that users implement the following steps
until the update can be applied.
* Close the Accutech Manager software tool's server component when not in use.
* Obtain guidance from Schneider Electric's cybersecurity recommendations Web
page. [f]
* Check with Schneider Electric, and apply the maintenance update as soon as
it becomes available.
One specific strategy that can mitigate the risk associated with the
vulnerability is to ensure that the vulnerable port (2537/TCP) is not
accessible from the Internet.
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 US-CERT Web page. Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies. [g] 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 Mitigation Strategies, [h] available for download
from the ICS-CERT Web page (www.ics-cert.org).
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.
ICS-CERT CONTACT
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
For industrial control systems security information and incident reporting:
www.ics-cert.org
REFERENCES
[a] Exodus Intelligence - https://www.exodusintel.com/, Web site last
accessed February 12, 2013.
[b] CWE, http://cwe.mitre.org/data/definitions/122.html, CWE-122: Heap-based
Buffer Overflow, Web site last accessed February 12, 2013.
[c] NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0658, NIST
uses this advisory to create the CVE Web site report. This Web site will
be active sometime after publication of this advisory.
[d] CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Web site last visited February 12, 2013.
[e] Schneider Electric Download Link,
http://www.schneider-electric.com/download/ww/en/results/0/1555898-Software--Released/28460036-Accutech
Web site last accessed February 12, 2013.
[f] Vendor's security recommendations -
http://www2.schneider-electric.com/sites/corporate/en/support/cybersecurity/cybersecurity.page
Web site last accessed February 12, 2013.
[g] CSSP Recommended Practices,
http://www.us-cert.gov/control_systems/practices/Recommended_Practices.html
Web site last accessed February 12, 2013.
[h] Cyber Intrusion Mitigation Strategies,
http://www.us-cert.gov/control_systems/pdf/ICS-TIP-12-146-01B.pdf, Web
site last accessed February 12, 2013.
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