Vulnerabilities / Threats
2/7/2012
01:53 PM
Connect Directly
RSS
E-Mail
50%
50%

10 Strategies To Fight Anonymous DDoS Attacks

Preventing distributed denial of service attacks may be impossible. But with advance planning, they can be mitigated and stopped. Learn where to begin.

4. Secure potential bottlenecks.
Which parts of the corporate network can become a bottleneck or weak link in a DDoS attack? A survey by Radware of 135 people with information security expertise--including IT managers as well as CIOs and CISOs--found that the bottlenecks they'd experienced included the server under attack (for 30%), their Internet pipe (27%), a firewall (24%), an intrusion prevention or detection system (8%), a SQL server (5%), or a load balancer (4%). For example, Sergey Shekyan, a Web application vulnerability scanner developer at Qualys, reported that he was able to DDoS a Squid proxy server using the free slowhttptest tool with slow read DDoS attack support. That's because while the server was theoretically able to handle 60,000 concurrent connections per minute, it had been misconfigured to only allow 1,024 open file descriptors at a time.

5. Watch what's happening on the network.
If prevention--including securing infrastructure and making sure it can reasonably scale to handle sharp increases in packet traffic--is the first step, the second is actively monitoring the network. "If the enterprise doesn't have visibility into their network traffic so they can exert control over the traffic, then they have a problem," said Dobbins.

6. Look beyond large attacks.
Historically, the most popular type of DDoS attack--and the one most used by Anonymous--has been a packet flood. The concept is simple: direct so many packets at a website that its servers buckle under the pressure. But not all effective DDoS attacks unload untold numbers of packets. Notably, a study by Radware of 40 DDoS attacks from 2011 found that only 9% involved more than 10 Gbps of bandwidth, while 76% involved less than 1 Gbps.

7. Beware application-layer attacks.
Attacks that eschew packet quantity for taking out a switch or application can unfortunately be quite difficult to detect. According to Radware's report, "it is much easier to detect and block a network flood attack--which is about sending a large volume of irrelevant traffic such as UDP floods, SYN floods, and TCP floods, typically spoofed--rather than an application flood attack where the attackers are using real IP addresses from real machines and running complete application transactions."

8. Watch for blended attacks.
Detection can get even trickier when attackers start targeting more than one application at a time, perhaps together with a packet flood. "Attackers are often likely to combine both packet flooding attacks with application-layer DDoS, to increase their odds of success," according to the Radware report. "The majority of organizations, which are targeted by sub-1-Gbps attacks, are targeted with a mix of network and application flood attacks."

9. Make upstream friends.
Large attacks can overwhelm even the largest enterprise network. "Work very closely with [your] Internet service provider--or for multinationals, providers--to successfully deal with these attacks," said Arbor's Dobbins. Build relationships and lines of communication in advance. "At 4 a.m., if there is a DDoS attack, it's not the time you want to be scrambling around trying to reconfigure your infrastructure, and finding who call at your ISP," he said.

10. Consider countermeasures.
While the legality of certain types of attack countermeasures is an open question, Radware said that network gear may be able to automatically mitigate suspected DDoS attacks. For example, it can silently drop questionable packets, or send a TCP reply to the attacker that advertises "window size equals 0," which says that for the time being, no new data can be received. "Legitimate clients generally respect this and will suspend their communication for the time being," according to Radware's report. "It seems that some attackers also honor this message and suspend the attack until a new, larger window size is advertised, which of course the site being attacked has no intention of doing."

It's no longer a matter of if you get hacked, but when. In this special retrospective of news coverage, Monitoring Tools And Logs Make All The Difference, Dark Reading takes a look at ways to measure your security posture and the challenges that lie ahead with the emerging threat landscape. (Free registration required.)

Previous
2 of 2
Next
Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Ogara7
50%
50%
Ogara7,
User Rank: Apprentice
2/2/2014 | 4:13:13 AM
re: 10 Strategies To Fight Anonymous DDoS Attacks
My friend got a guy to dodos my minecraft server too... I managed to talk to him nd calm the situation down but I'm still concerned. My PC is 4 years old! It will never survive!
KyleT412
50%
50%
KyleT412,
User Rank: Apprentice
7/21/2013 | 5:44:20 AM
re: 10 Strategies To Fight Anonymous DDoS Attacks
I need a trick FAST. Apparently Anon is going to DdoS me on Monday D:. I own a minecraft server and they came on and fucked it up so i DdoSed him for 5mins. He said they will DdoS me and fry my router OR I have to pay them $800. And im 14 soooo ya.
seoarcher
50%
50%
seoarcher,
User Rank: Apprentice
1/26/2013 | 4:18:43 AM
re: 10 Strategies To Fight Anonymous DDoS Attacks
I also forgot to mention it is running php on a windows machine co .htaccess blocking will not work. I post some info here also http://www.seoarcher.com .
seoarcher
50%
50%
seoarcher,
User Rank: Apprentice
1/26/2013 | 4:14:59 AM
re: 10 Strategies To Fight Anonymous DDoS Attacks
My http://www.seoarcher.com website is suffering badly by a DoS attack. The user is changing ips daily so its hard to stop. Any help . pleasee...
jeandebogue
50%
50%
jeandebogue,
User Rank: Apprentice
11/28/2012 | 6:04:55 PM
re: 10 Strategies To Fight Anonymous DDoS Attacks
It's because there is a trick to block the traffic before it reaches you. In fact there are more than just 1 trick.

If you are curious let me know and I'll let you know what it is.
Juffe
50%
50%
Juffe,
User Rank: Apprentice
10/3/2012 | 9:46:46 AM
re: 10 Strategies To Fight Anonymous DDoS Attacks
You should also keep a close eye on the security logs for unknown username / password login attempts since they also consume CPU / RAM to manage.. When it comes to Windows servers I personally recommend having a look at Syspeace ( http://www.syspeace.com ) and for Linux fail2ban. Also consider redirecting 404 and 403 errors on webservers to somewhere else, to Google or 127.0.0.1 or something ..
davesg
50%
50%
davesg,
User Rank: Apprentice
2/8/2012 | 7:38:55 PM
re: 10 Strategies To Fight Anonymous DDoS Attacks
IMO most of this is fluff. If the bandwidth of a targetted DOS attack is larger than the pipe it is unstoppable. Really one of the things you mentioned, being friends with your upstream, and your upstreams pipe being bigger than the DOS attacks capacity is the only thing that will help you.
virtual
50%
50%
virtual,
User Rank: Apprentice
2/8/2012 | 5:55:13 PM
re: 10 Strategies To Fight Anonymous DDoS Attacks
There are other steps that companies and the government can take to stop hackers from breaking into networks, even the Chinese hackers.
Register for Dark Reading Newsletters
Partner Perspectives
What's This?
In a digital world inundated with advanced security threats, Intel Security seeks to transform how we live and work to keep our information secure. Through hardware and software development, Intel Security delivers robust solutions that integrate security into every layer of every digital device. In combining the security expertise of McAfee with the innovation, performance, and trust of Intel, this vision becomes a reality.

As we rely on technology to enhance our everyday and business life, we must too consider the security of the intellectual property and confidential data that is housed on these devices. As we increase the number of devices we use, we increase the number of gateways and opportunity for security threats. Intel Security takes the “security connected” approach to ensure that every device is secure, and that all security solutions are seamlessly integrated.
Featured Writers
White Papers
Cartoon
Current Issue
Dark Reading's October Tech Digest
Fast data analysis can stymie attacks and strengthen enterprise security. Does your team have the data smarts?
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2013-4594
Published: 2014-10-25
The Payment for Webform module 7.x-1.x before 7.x-1.5 for Drupal does not restrict access by anonymous users, which allows remote anonymous users to use the payment of other anonymous users when submitting a form that requires payment.

CVE-2014-0476
Published: 2014-10-25
The slapper function in chkrootkit before 0.50 does not properly quote file paths, which allows local users to execute arbitrary code via a Trojan horse executable. NOTE: this is only a vulnerability when /tmp is not mounted with the noexec option.

CVE-2014-1927
Published: 2014-10-25
The shell_quote function in python-gnupg 0.3.5 does not properly quote strings, which allows context-dependent attackers to execute arbitrary code via shell metacharacters in unspecified vectors, as demonstrated using "$(" command-substitution sequences, a different vulnerability than CVE-2014-1928....

CVE-2014-1928
Published: 2014-10-25
The shell_quote function in python-gnupg 0.3.5 does not properly escape characters, which allows context-dependent attackers to execute arbitrary code via shell metacharacters in unspecified vectors, as demonstrated using "\" (backslash) characters to form multi-command sequences, a different vulner...

CVE-2014-1929
Published: 2014-10-25
python-gnupg 0.3.5 and 0.3.6 allows context-dependent attackers to have an unspecified impact via vectors related to "option injection through positional arguments." NOTE: this vulnerability exists because of an incomplete fix for CVE-2013-7323.

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Follow Dark Reading editors into the field as they talk with noted experts from the security world.