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AUSCERT External Security Bulletin Redistribution
ESB-2019.0492
Pangea Communications Internet FAX ATA
18 February 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Pangea Communications Internet FAX Analog Telephone Adapter
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6551
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-19-045-01
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Advisory (ICSA-19-045-01)
Pangea Communications Internet FAX ATA
Original release date: February 14, 2019
1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low skill level to exploit/public exploits
are available
o Vendor: Pangea Communications
o Equipment: Internet FAX Analog Telephone Adapter (ATA)
o Vulnerability: Authentication Bypass Using an Alternate Path or Channel
2. RISK EVALUATION
Successful exploitation of this vulnerability could cause the device to reboot
and create a continual denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Pangea Internet FAX ATA, an Analog Telephone Adapter,
are affected:
o Internet FAX ATA Version 3.1.8 and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
Using a specially crafted URL, an attacker can bypass user authentication to
cause the device to reboot, which may be used to cause a continual
denial-of-service condition.
CVE-2019-6551 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).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Communication, Information Technology
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
Ankit Anubhav of NewSky Security reported this vulnerability to NCCIC.
4. MITIGATIONS
Pangea Communications has contacted users of the affected product and have
deployed a patch to resolve the issue. For more information, contact Pangea
Communications support using the following link:
https://www.pangea-comm.com/contact-us/
NCCIC recommends users take defensive measures to protect themselves from
social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC 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 Strategies.
Additional mitigation guidance and recommended practices are publicly available
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.
Legal Notice
All information products included in http://ics-cert.us-cert.gov are
provided "as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/.
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