Pangea Communications Internet FAX ATA Authentication Bypass Using an Alternate Path or Channel (CVE-2019-6551)

# ICS Advisory (ICSA-19-045-01) ## Pangea Communications Internet FAX ATA Original release date: February 14, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-045-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-045-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-045-01) ### Legal Notice All information products included in [https://us-cert.gov/ics](/ics) 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 [https://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 7.5** * **ATTENTION:** Exploitable remotely/low skill level to exploit/public exploits are available * **Vendor:** Pangea Communications * **Equipment:** Internet FAX Analog Telephone Adapter (ATA) * **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: * 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](https://cwe.mitre.org/data/definitions/288.html) 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](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Communication, Information Technology * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **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: * Do not click web links or open unsolicited attachments in email messages. * Refer to [Recognizing and Avoiding Email Scams](/reading_room/emailscams_0905.pdf) for more information on avoiding email scams. * Refer to [Avoiding Social Engineering and Phishing Attacks](/cas/tips/ST04-014.html) 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](/ics/content/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](/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS-CERT website](/ics/) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](/ics/tips/ICS-TIP-12-146-01B). 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.