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
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-2014-3409
Published: 2014-10-25
The Ethernet Connectivity Fault Management (CFM) handling feature in Cisco IOS 12.2(33)SRE9a and earlier and IOS XE 3.13S and earlier allows remote attackers to cause a denial of service (device reload) via malformed CFM packets, aka Bug ID CSCuq93406.

CVE-2014-4620
Published: 2014-10-25
The EMC NetWorker Module for MEDITECH (aka NMMEDI) 3.0 build 87 through 90, when EMC RecoverPoint and Plink are used, stores cleartext RecoverPoint Appliance credentials in nsrmedisv.raw log files, which allows local users to obtain sensitive information by reading these files.

CVE-2014-4623
Published: 2014-10-25
EMC Avamar 6.0.x, 6.1.x, and 7.0.x in Avamar Data Store (ADS) GEN4(S) and Avamar Virtual Edition (AVE), when Password Hardening before 2.0.0.4 is enabled, uses UNIX DES crypt for password hashing, which makes it easier for context-dependent attackers to obtain cleartext passwords via a brute-force a...

CVE-2014-4624
Published: 2014-10-25
EMC Avamar Data Store (ADS) and Avamar Virtual Edition (AVE) 6.x and 7.0.x through 7.0.2-43 do not require authentication for Java API calls, which allows remote attackers to discover grid MCUser and GSAN passwords via a crafted call.

CVE-2014-6151
Published: 2014-10-25
CRLF injection vulnerability in IBM Tivoli Integrated Portal (TIP) 2.2.x allows remote authenticated users to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.

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.