Overview
The article discusses a significant increase in amplification attacks utilizing the memcached protocol over UDP port 11211. It highlights the mechanics of these attacks, their impact, and the vulnerabilities associated with memcached servers, along with recommendations for mitigation.
What You'll Learn
1
How to disable UDP support in memcached to prevent amplification attacks
2
Why IP spoofing is a critical vulnerability in amplification attacks
3
When to use TCP instead of UDP for safer network communications
Prerequisites & Requirements
- Basic understanding of DDoS attacks and network protocols
- Familiarity with network monitoring tools like tcpdump and nmap(optional)
Key Questions Answered
What is the memcrashed amplification attack?
The memcrashed amplification attack exploits the memcached protocol over UDP port 11211, allowing attackers to send small requests that generate significantly larger responses, overwhelming target networks with traffic. This attack can reach bandwidths of up to 260Gbps.
How can memcached servers be secured against amplification attacks?
To secure memcached servers, users should disable UDP support if not needed, configure the server to listen only on localhost, and ensure proper firewall settings are in place. This prevents unauthorized access and mitigates the risk of amplification attacks.
What are the statistics on recent memcached attacks?
Recent statistics indicate that the number of memcached attacks has spiked significantly, with peak traffic reaching 260Gbps. This highlights the growing threat posed by this amplification vector in the cybersecurity landscape.
What are the common source IPs involved in memcached attacks?
The majority of attacking IPs are from hosting providers like OVH, DigitalOcean, and Sakura, with a total of 5,729 unique source IPs identified. This concentration indicates a widespread vulnerability among memcached servers globally.
Key Statistics & Figures
Peak bandwidth of memcached attacks
260Gbps
This peak was observed during recent amplification attacks utilizing the memcached protocol.
Unique source IPs of memcached servers
5,729
These IPs were identified as being involved in amplification attacks, with many originating from major hosting providers.
Technologies & Tools
Some links below are affiliate links. We may earn a commission if you make a purchase.
Backend
Memcached
Used as a caching solution that is vulnerable to amplification attacks when configured to use UDP.
Tools
Tcpdump
Used for monitoring network traffic to identify potential DDoS attacks.
Tools
Nmap
Used for scanning and testing the accessibility of memcached servers.
Key Actionable Insights
1Disable UDP support in memcached to prevent potential DDoS attacks.By configuring memcached to listen only on localhost and disabling UDP, you can significantly reduce the risk of your server being exploited for amplification attacks.
2Monitor your network for unusual UDP traffic patterns.Using tools like tcpdump can help identify potential amplification attacks in real-time, allowing for quicker response and mitigation.
3Educate your team about the risks of IP spoofing.Understanding how IP spoofing enables amplification attacks is crucial for developing effective security measures and response strategies.
Common Pitfalls
1
Leaving UDP support enabled on memcached servers can lead to exploitation.
Many administrators forget to disable UDP, which can allow attackers to send small requests that generate large responses, overwhelming the server and network.
2
Failing to monitor network traffic for unusual patterns.
Without proper monitoring, organizations may not detect ongoing amplification attacks until significant damage has occurred.
Related Concepts
Ddos Attacks
Network Security
Amplification Attacks
Memcached Configuration