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TLP:WHITE

Advisory (ICSA-16-014-01)

Advantech WebAccess Vulnerabilities

Original release date: January 14, 2016 | Last revised: January 19, 2016

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OVERVIEW

Ilya Karpov of Positive Technologies, Ivan Sanchez, Andrea Micalizzi, Ariele Caltabiano, Fritz Sands, Steven Seeley, and an anonymous researcher have identified multiple vulnerabilities in Advantech WebAccess application. Many of these vulnerabilities were reported through the Zero Day Initiative (ZDI) and iDefense. Advantech has produced a new version to mitigate these vulnerabilities. Ivan Sanchez has tested the new version to validate that it resolves the vulnerabilities which he reported.

These vulnerabilities could be exploited remotely.

AFFECTED PRODUCTS

Advantech reports that the vulnerabilities affect the following versions of WebAccess:

  • WebAccess Version 8.0 and prior versions.

IMPACT

An attacker who exploits these vulnerabilities may be able to upload, create, or delete arbitrary files on the target system, deny access to valid users, or remotely execute arbitrary code.

Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.

BACKGROUND

Advantech is based in Taiwan and has distribution offices in 21 countries worldwide.

The affected product, WebAccess, formerly known as BroadWin WebAccess, is a web-based SCADA and human-machine interface (HMI) product. According to Advantech, WebAccess is deployed across several sectors including Commercial Facilities, Critical Manufacturing, Energy, and Government Facilities. Advantech estimates that these products are used globally.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

ACCESS OF MEMORY LOCATION AFTER END OF BUFFERa

The software reads or writes to a buffer using an index or pointer that references a memory location after the end of the buffer.

CVE-2016-0851b has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).c

UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPEd

An attacker can upload or create arbitrary files on the server without authentication or constraint.

CVE-2016-0854e has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).f

PATH TRAVERSALg

The virtual directory created by WebAccess can be browsed anonymously without authentication.

CVE-2016-0855h has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).i

STACK-BASED BUFFER OVERFLOWj

There are many instances where the buffer on the stack can be overwritten.

CVE-2016-0856k has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).l

HEAP-BASED BUFFER OVERFLOWm

There are many conditions in which more space than what is allocated can be written to the heap.

CVE-2016-0857n has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).o

RACE CONDITIONp

A specially crafted request can cause a buffer overflow in a shared virtual memory area.

CVE-2016-0858q has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).r

INTEGER OVERFLOW TO BUFFER OVERFLOWs

An attacker can send a crafted RPC request to the Kernel service to cause a stack-based buffer overflow.

CVE-2016-0859t has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).u

IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFERv

An attacker can send a crafted RPC request to the BwpAlarm subsystem to cause a buffer overflow on global variables.

CVE-2016-0860w has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).x

IMPROPER ACCESS CONTROLy

Normal and remote users have access to files and folders that only administrators should be allowed to access.

CVE-2016-0852z has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).aa

IMPROPER INPUT VALIDATIONbb

Input validation vulnerabilities could allow an attacker to gain sensitive information from the target system.

CVE-2016-0853cc has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).dd

CROSS-SITE SCRIPTINGee

The web server does not filter user input correctly, allowing a malicious user to initiate a cross-site scripting vulnerability.

CVE-2015-3948ff has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:R).gg

SQL INJECTIONhh

Web server settings, accounts, and projects may be modified through scripted commands.

CVE-2015-3947ii has been assigned to this vulnerability. A CVSS v3 base score of 6.4 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:P/RL:O/RC:R).jj

CROSS-SITE REQUEST FORGERYkk

The web server accepts commands via specific scripts that imitate trusted accounts.

CVE-2015-3946ll has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:R).mm

EXTERNAL CONTROL OF FILE NAME OR PATHnn

WebAccess can be made to run remote code through the use of a browser plug-in.

CVE-2015-6467oo has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:R).pp

CLEARTEXT STORAGE OF SENSITIVE INFORMATIONqq

Email project accounts are stored in clear text.

CVE-2015-3943rr has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been assigned; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:R).ss

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities.

DIFFICULTY

An attacker with a low skill would be able to exploit these vulnerabilities.

MITIGATION

Advantech has released a new version of WebAccess, Version 8.1, to address the reported vulnerabilities. This new version is available on the Advantech website at the following location:

http://www.advantech.com/industrial-automation/webaccess

ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

  • Minimize network exposure for all control system devices and/or systems and ensure that they are not accessible from 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 VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.

ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page athttp://ics-cert.us-cert.gov/content/recommended-practices. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

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 Strategies, that is available for download from the ICS-CERT web site (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.


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

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or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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