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

End of Bibblio RCM includes -->
11/5/2019
01:00 PM
Larry Loeb
Larry Loeb
Larry Loeb

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
Improving Enterprise Cybersecurity With XDR
Enterprises are looking at eXtended Detection and Response technologies to improve their abilities to detect, and respond to, threats. While endpoint detection and response is not new to enterprise security, organizations have to improve network visibility, expand data collection and expand threat hunting capabilites if they want their XDR deployments to succeed. This issue of Tech Insights also includes: a market overview for XDR from Omdia, questions to ask before deploying XDR, and an XDR primer.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2022-34918
PUBLISHED: 2022-07-04
An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in nft_set_elem_init (leading to a buffer overflow) could be used by a local attacker to escalate privileges, a different vulnerability than CVE-2022-32250. (The attacker can obtain root access, but must start with an u...
CVE-2022-34829
PUBLISHED: 2022-07-04
Zoho ManageEngine ADSelfService Plus before 6203 allows a denial of service (application restart) via a crafted payload to the Mobile App Deployment API.
CVE-2022-31600
PUBLISHED: 2022-07-04
NVIDIA DGX A100 contains a vulnerability in SBIOS in the SmmCore, where a user with high privileges can chain another vulnerability to this vulnerability, causing an integer overflow, possibly leading to code execution, escalation of privileges, denial of service, compromised integrity, and informat...
CVE-2022-31601
PUBLISHED: 2022-07-04
NVIDIA DGX A100 contains a vulnerability in SBIOS in the SmbiosPei, which may allow a highly privileged local attacker to cause an out-of-bounds write, which may lead to code execution, denial of service, compromised integrity, and information disclosure.
CVE-2022-31602
PUBLISHED: 2022-07-04
NVIDIA DGX A100 contains a vulnerability in SBIOS in the IpSecDxe, where a user with elevated privileges and a preconditioned heap can exploit an out-of-bounds write vulnerability, which may lead to code execution, denial of service, data integrity impact, and information disclosure.