Executive Summary
Summary | |
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Title | Heightened DDoS Threat Posed by Mirai and Other Botnets |
Informations | |||
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Name | TA16-288A | First vendor Publication | 2016-10-14 |
Vendor | US-CERT | Last vendor Modification | 2016-10-14 |
Severity (Vendor) | N/A | Revision | N/A |
Security-Database Scoring CVSS v3
Cvss vector : N/A | |||
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Overall CVSS Score | NA | ||
Base Score | NA | Environmental Score | NA |
impact SubScore | NA | Temporal Score | NA |
Exploitabality Sub Score | NA | ||
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : | |||
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Cvss Base Score | N/A | Attack Range | N/A |
Cvss Impact Score | N/A | Attack Complexity | N/A |
Cvss Expoit Score | N/A | Authentication | N/A |
Calculate full CVSS 2.0 Vectors scores |
Detail
Recently, IoT devices have been used to create large-scale botnetsnetworks of devices infected with self-propagating malwarethat can execute crippling distributed denial-of-service (DDoS) attacks. IoT devices are particularly susceptible to malware, so protecting these devices and connected hardware is critical to protect systems and networks. Description On September 20, 2016, Brian Krebs security blog (krebsonsecurity.com) was targeted by a massive DDoS attack, one of the largest on record, exceeding 620 gigabits per second (Gbps).[1 [ https://krebsonsecurity.com/2016/09/krebsonsecurity-hit-with-record-ddos/ ]] An IoT botnet powered by Mirai malware created the DDoS attack. The Mirai malware continuously scans the Internet for vulnerable IoT devices, which are then infected and used in botnet attacks. The Mirai bot uses a short list of 62 common default usernames and passwords to scan for vulnerable devices. Because many IoT devices are unsecured or weakly secured, this short dictionary allows the bot to access hundreds of thousands of devices.[2 [ https://nakedsecurity.sophos.com/2016/10/05/mirai-internet-of-things-malware-from-krebs-ddos-attack-goes-open-source/ ]] The purported Mirai author claimed that over 380,000 IoT devices were enslaved by the Mirai malware in the attack on Krebs website.[3 [ https://www.pcworld.com/article/3126362/security/iot-malware-behind-record-ddos-attack-is-now-available-to-all-hackers.html ]] In late September, a separate Mirai attack on French webhost OVH broke the record for largest recorded DDoS attack. That DDoS was at least 1.1 terabits per second (Tbps), and may have been as large as 1.5 Tbps.[4 [ http://arstechnica.com/security/2016/09/botnet-of-145k-cameras-reportedly-deliver-internets-biggest-ddos-ever/ ]] The IoT devices affected in the latest Mirai incidents were primarily home routers, network-enabled cameras, and digital video recorders.[5 [ http://www.darkreading.com/denial-of-service-attacks/iot-ddos-attack-code-released-/d/d-id/1327086 ]] Mirai malware source code was published online at the end of September, opening the door to more widespread use of the code to create other DDoS attacks. In early October, Krebs on Security reported on a separate malware family responsible for other IoT botnet attacks.[6 [ https://krebsonsecurity.com/2016/10/source-code-for-iot-botnet-mirai-released/ ]] This other malware, whose source code is not yet public, is named Bashlite. This malware also infects systems through default usernames and passwords. Level 3 Communications, a security firm, indicated that the Bashlite botnet may have about one million enslaved IoT devices.[7 [ http://blog.level3.com/security/attack-of-things/ ]] Impact With the release of the Mirai source code on the Internet, there are increased risks of more botnets being generated. Both Mirai and Bashlite can exploit the numerous IoT devices that still use default passwords and are easily compromised. Such botnet attacks could severely disrupt an organizations communications or cause significant financial harm. Software that is not designed to be secure contains vulnerabilities that can be exploited. Software-connected devices collect data and credentials that could then be sent to an adversarys collection point in a back-end application. Solution Cybersecurity professionals should harden networks against the possibility of a DDoS attack. For more information on DDoS attacks, please refer to US-CERT Security Publication DDoS Quick Guide [ https://www.us-cert.gov/sites/default/files/publications/DDoS%20Quick%20Guide.pdf ] and the US-CERT Alert on UDP-Based Amplification Attacks [ https://www.us-cert.gov/ncas/alerts/TA14-017A ]. *"Mitigation"* In order to remove the Mirai malware from an infected IoT device, users and administrators should take the following actions: * Disconnect device from the network. *"Preventive Steps"* In order to prevent a malware infection on an IoT device, users and administrators should take following precautions: * Ensure all default passwords are changed to strong passwords. Default usernames and passwords for most devices can easily be found on the Internet, making devices with default passwords extremely vulnerable. |
Original Source
Url : http://www.us-cert.gov/ncas/alerts/TA16-288A |
Alert History
Date | Informations |
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2016-10-15 05:22:22 |
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