Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Network Security

11/5/2019
01:00 PM
Larry Loeb
Larry Loeb
Larry Loeb
50%
50%

Complex Q3 DDoS Can Have 11 Attack Vectors

Link 11 has issued a summary of what they have found out about characteristics of DDoS attacks that occurred in Q3 2019.

Link 11, based in Frankfurt Germany, has issued a summary of what they have found out about characteristics of DDoS attacks that occurred in Q3 2019. They saw that high-bandwidth and complex DDoS attacks continued unchanged in this time period.

The data is based on defended attacks on websites and servers that are customers of Link11. In addition to network analyses and the evaluation of DDoS attack data, the Link11 DDoS report says that it also makes use of open source intelligence (OSINT) analyses.

The most important attack form to them was "volume" attacks. These are high-bandwidth attacks which are intended to block the attacked company's external connection. During Q3, they found the bandwidth peak was 102 Gbps. The largest amount of packets per second that they saw was 29 million.

This kind of high-volume attack is dependent on methods that amplify DDoS traffic. "Amplification" refers to eliciting an asymmetrical server response that is significantly larger than the original request sent.

There are differing reinforcement techniques that can drive up attack volumes. DNS reflection was by far the most frequently used reflection amplification vector (42%). During a DNS amplification attack, the perpetrator sends out a DNS query with a forged IP address (the victim's) to an open DNS resolver, prompting it to reply back to that address with a DNS response.

DNS-type attacks were followed in the "popularity" list by SNMP with 21% and CLDAP with 14%. During an SNMP reflection attack, the perpetrator sends out a large number of SNMP queries with a forged IP address (again, the victim's) to numerous connected devices that, in turn, reply to that forged address.

CLDAP stands for Connection-less Lightweight Directory Access Protocol and is standardized in RFC 3352. CLDAP is the UDP compliment to Microsoft's Active Directory TCP protocol LDAP. CLDAP operates on a similar principal as LDAP, with clients attempting to retrieve server information. It's not necessary to establish a connection before sending out the query.

Link11 says that new attack techniques, such as WS Discovery (Web Services Discovery) and Apple Remote, were registered for the first time in the second quarter of 2019. The report says that they were detected several times in Q3 attacks.

This becomes important since every second attack (52%) was based on several attack techniques. Most frequently, Link 11 found that the attackers combined three vectors. The maximum number of vectors, as registered by Link11 in the third quarter, was 11.

Rolf Gierhard, vice president of marketing at Link11, commented on the report: "Attackers are increasingly combining multiple attack techniques or expanding their attack set with new protocols. Attacks are becoming more intelligent and disguising themselves as legitimate network traffic. This makes it difficult for many companies to detect them quickly and effectively avert them."

— Larry Loeb has written for many of the last century's major "dead tree" computer magazines, having been, among other things, a consulting editor for BYTE magazine and senior editor for the launch of WebWeek.

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Edge-DRsplash-10-edge-articles
I Smell a RAT! New Cybersecurity Threats for the Crypto Industry
David Trepp, Partner, IT Assurance with accounting and advisory firm BPM LLP,  7/9/2021
News
Attacks on Kaseya Servers Led to Ransomware in Less Than 2 Hours
Robert Lemos, Contributing Writer,  7/7/2021
Commentary
It's in the Game (but It Shouldn't Be)
Tal Memran, Cybersecurity Expert, CYE,  7/9/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
How Enterprises are Attacking the Cybersecurity Problem
Concerns over supply chain vulnerabilities and attack visibility drove some significant changes in enterprise cybersecurity strategies over the past year. Dark Reading's 2021 Strategic Security Survey showed that many organizations are staying the course regarding the use of a mix of attack prevention and threat detection technologies and practices for dealing with cyber threats.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-42258
PUBLISHED: 2021-10-22
BQE BillQuick Web Suite 2018 through 2021 before 22.0.9.1 allows SQL injection for unauthenticated remote code execution, as exploited in the wild in October 2021 for ransomware installation. SQL injection can, for example, use the txtID (aka username) parameter. Successful exploitation can include ...
CVE-2020-28968
PUBLISHED: 2021-10-22
Draytek VigorAP 1000C contains a stored cross-site scripting (XSS) vulnerability in the RADIUS Setting - RADIUS Server Configuration module. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload in the username input field.
CVE-2020-28969
PUBLISHED: 2021-10-22
Aplioxio PDF ShapingUp 5.0.0.139 contains a buffer overflow which allows attackers to cause a denial of service (DoS) via a crafted PDF file.
CVE-2020-36485
PUBLISHED: 2021-10-22
Portable Ltd Playable v9.18 was discovered to contain an arbitrary file upload vulnerability in the filename parameter of the upload module. This vulnerability allows attackers to execute arbitrary code via a crafted JPEG file.
CVE-2020-36486
PUBLISHED: 2021-10-22
Swift File Transfer Mobile v1.1.2 and below was discovered to contain a cross-site scripting (XSS) vulnerability via the 'path' parameter of the 'list' and 'download' exception-handling.