Attacks/Breaches
8/30/2013
06:52 PM
Ehsan Foroughi
Ehsan Foroughi
Commentary
Connect Directly
RSS
E-Mail
50%
50%

Thwart DNS Hijackers: 5 Tips

Domain name system attacks hit The New York Times and Twitter hard last month. Here are five ways to make your DNS records harder to hack and easier to recover if they're compromised.

4. Avoid having low TTL where possible, specifically on master records.

DNS caching can delay a DNS hijacking. The higher the TTL (time to live), the longer a hijacked domain needs to stay hijacked before it can reach the masses. However, many services use low TTL; for instance, only one minute, for load-balancing purposes.

One way of avoiding low TTL on the master record in high-traffic services is to have the master record point to a number of static servers that serve a lean landing page and have all other services use a sub-domain with low TTL.

For example, you can have "your-service.com" with high TTL to serve a small landing/login page, and use "www.your-service.com" and "api.your-service.com" with low TTL service for the rest of the application. As long as the DNS records for "your-service.com" are set up with high TTL and point to your secure DNS servers, hijacking the registrar will take a fairly long time to hit the majority of users due to the caching nature of the DNS.

5. Use high TTL for MX records to delay the hijackers' ability to reroute your emails.

Despite the fact email is known to be inherently insecure, a large amount of confidential information gets passed around in email inside companies. DNS hijackers can essentially steal these emails and cause considerable damage to an organization. Using high TTL for mail exchanger (MX) records in a DNS adds a delay for hijacking emails. Using email encryption such as PGP (pretty good privacy) will also ensure that attackers can't steal the information in the emails.

Previous
2 of 2
Next
Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Flash Poll
Current Issue
Cartoon
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2013-7392
Published: 2014-07-22
Gitlist allows remote attackers to execute arbitrary commands via shell metacharacters in a file name to Source/.

CVE-2014-2385
Published: 2014-07-22
Multiple cross-site scripting (XSS) vulnerabilities in the web UI in Sophos Anti-Virus for Linux before 9.6.1 allow local users to inject arbitrary web script or HTML via the (1) newListList:ExcludeFileOnExpression, (2) newListList:ExcludeFilesystems, or (3) newListList:ExcludeMountPaths parameter t...

CVE-2014-3518
Published: 2014-07-22
jmx-remoting.sar in JBoss Remoting, as used in Red Hat JBoss Enterprise Application Platform (JEAP) 5.2.0, Red Hat JBoss BRMS 5.3.1, Red Hat JBoss Portal Platform 5.2.2, and Red Hat JBoss SOA Platform 5.3.1, does not properly implement the JSR 160 specification, which allows remote attackers to exec...

CVE-2014-3530
Published: 2014-07-22
The org.picketlink.common.util.DocumentUtil.getDocumentBuilderFactory method in PicketLink, as used in Red Hat JBoss Enterprise Application Platform (JBEAP) 5.2.0 and 6.2.4, expands entity references, which allows remote attackers to read arbitrary code and possibly have other unspecified impact via...

CVE-2014-4326
Published: 2014-07-22
Elasticsearch Logstash 1.0.14 through 1.4.x before 1.4.2 allows remote attackers to execute arbitrary commands via a crafted event in (1) zabbix.rb or (2) nagios_nsca.rb in outputs/.

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Where do information security startups come from? More important, how can I tell a good one from a flash in the pan? Learn how to separate ITSec wheat from chaff in this episode.