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.

The Syrian Electronic Army: 9 Things We Know
(click image for larger view)
The Syrian Electronic Army: 9 Things We Know
In light of the recent domain name system (DNS) hijacking attacks on The New York Times, Twitter and Huffington Post, it's important for CIOs to take a closer look at their DNS security strategy -- and to be able to respond quickly if their company is attacked.

DNS records are basically sets of instructions that help connect your website to the outside world. The following five practices make these records harder to hijack and easier to recover if they are compromised, thereby reducing the damage attackers can cause. When DNS records are hijacked, a company must be able to get them back as quickly as possible because once the malicious records hit the caching servers, it becomes much harder to undo the damage.

1. Use best practices for credentials that allow changes to be made to DNS records.

Your whole service is only as secure as the security of the password to your DNS registrant account. Ensure that access to accounts used to update DNS records is limited to as few people in your organization as possible. Make sure to use hard-to-guess passwords, and avoid reusing passwords at all costs.

[ Here's why you shouldn't buy Android apps from off-brand sites. Read Hack 99% Of Android Devices: Big Vulnerability. ]

2. Revisit the choice of DNS provider regularly as you grow.

Many companies, particularly start-ups, frequently choose DNS registrants and DNS service providers based on a combination of their pricing and the ease of setup and use. Sometimes that means the DNS provider doesn't have much information about the owner other than a username and password used to identify the account. In cases of social engineering attacks or compromised passwords, it might be hard to reclaim the domain.

As companies grow, they should revisit their choice of provider every few months to make sure that it's capable of handling the level of security the company needs. Popular and high-profile services might be targeted by hackers with agendas -- and not every provider is capable of handling the heat that comes with popularity.

3. Make use of SSL certificates.

DNS hijacking can effectively be used to perform man-in-the-middle (MITM) attacks. In a MITM attack, the attacker diverts the user to a malicious server he controls. The malicious server then sends the user's request to the original server and sends the server's response back to the user. This setup allows the attacker to steal the information being passed back and forth, inject malicious content into responses before sending them back to the user, or both.

This is one of the highest risks associated with DNS hijacking and can cause a lot of damage in the form of stolen credentials and injection of malicious content.

To arm yourself, enforce validation of SSL/TLS certificates and use certificate pinning in mobile apps and rich clients. Certificate validation means the attacker must get a certificate tied to the stolen domain before being able to carry out the MITM attack. Pinning certificates in mobile and rich clients will take this restriction even further by ensuring the attacker will need access to the pinned certificate's private keys before being able to carry out the attack. This will reduce the risk of a MITM attack, which means the DNS hijack will do much less prolonged damage.

Previous
1 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-2014-0972
Published: 2014-08-01
The kgsl graphics driver for the Linux kernel 3.x, as used in Qualcomm Innovation Center (QuIC) Android contributions for MSM devices and other products, does not properly prevent write access to IOMMU context registers, which allows local users to select a custom page table, and consequently write ...

CVE-2014-2627
Published: 2014-08-01
Unspecified vulnerability in HP NonStop NetBatch G06.14 through G06.32.01, H06 through H06.28, and J06 through J06.17.01 allows remote authenticated users to gain privileges for NetBatch job execution via unknown vectors.

CVE-2014-3009
Published: 2014-08-01
The GDS component in IBM InfoSphere Master Data Management - Collaborative Edition 10.0 through 11.0 and InfoSphere Master Data Management Server for Product Information Management 9.0 and 9.1 does not properly handle FRAME elements, which makes it easier for remote authenticated users to conduct ph...

CVE-2014-3302
Published: 2014-08-01
user.php in Cisco WebEx Meetings Server 1.5(.1.131) and earlier does not properly implement the token timer for authenticated encryption, which allows remote attackers to obtain sensitive information via a crafted URL, aka Bug ID CSCuj81708.

CVE-2014-3534
Published: 2014-08-01
arch/s390/kernel/ptrace.c in the Linux kernel before 3.15.8 on the s390 platform does not properly restrict address-space control operations in PTRACE_POKEUSR_AREA requests, which allows local users to obtain read and write access to kernel memory locations, and consequently gain privileges, via a c...

Best of the Web
Dark Reading Radio