Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.


02:40 AM

Weapons of Mass Redirection

Protecting your users from malicious DNS servers

12:40 PM -- So you’re just starting to get your arms around the Web exploit threat, and now yet another threat rears its ugly head: the silent but deadly attack of the corrupted DNS resolution server. (See DNS Inventor Warns of Next Big Threat.)

Also known as DNS resolution path corruption, this attack is where compromised or bad DNS servers provide false information that sends users to malicious sites. In a newly released study, researchers from Georgia Tech and Google found 68,000 of these DNS servers on the Net. Paul Mockapetris, the inventor of the Domain Name System (DNS) and chief scientist and chairman of the board for network naming and address vendor Nominum, calls this threat “weapons of mass redirection.”

Most users don’t even have a clue that they connect to a DNS server, malicious or not. Mockapetris says there are still ways to help keep your end users safe from this type of attack, though.

First, make sure your local DNS servers are trustworthy, possibly with the help of your ISP. “Even if [you're] using free software, use the latest version,” he says. And make sure any DNS registry modifications get monitored, he adds.

Mockapetris recommends educating "road warriors" about the dangers of WiFi hotspots. Have them use a VPN connection over these Internet links. And don’t forget to secure your own intranet, he says: “Make sure that your DNS server technology is up to date. Consider DNS server software that actively looks for and defeats attacks if you are a high-value target,” he says.

You can also block port 53 (DNS) and force users to connect to your internal DNS servers. “If packets are blocked, check the sending machines for registry modifications," Mockapetris says.

— Kelly Jackson Higgins, Senior Editor, Dark Reading

  • Nominum Inc.

    Comment  | 
    Print  | 
    More Insights
  • Comments
    Newest First  |  Oldest First  |  Threaded View
    How SolarWinds Busted Up Our Assumptions About Code Signing
    Dr. Jethro Beekman, Technical Director,  3/3/2021
    'ObliqueRAT' Now Hides Behind Images on Compromised Websites
    Jai Vijayan, Contributing Writer,  3/2/2021
    Attackers Turn Struggling Software Projects Into Trojan Horses
    Robert Lemos, Contributing Writer,  2/26/2021
    Register for Dark Reading Newsletters
    White Papers
    Cartoon Contest
    Write a Caption, Win an Amazon Gift Card! Click Here
    Latest Comment: This comment is waiting for review by our moderators.
    Current Issue
    2021 Top Enterprise IT Trends
    We've identified the key trends that are poised to impact the IT landscape in 2021. Find out why they're important and how they will affect you today!
    Flash Poll
    How Enterprises are Developing Secure Applications
    How Enterprises are Developing Secure Applications
    Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
    Twitter Feed
    Dark Reading - Bug Report
    Bug Report
    Enterprise Vulnerabilities
    From DHS/US-CERT's National Vulnerability Database
    PUBLISHED: 2021-03-04
    Xerox AltaLink B8045/B8055/B8065/B8075/B8090 and C8030/C8035/C8045/C8055/C8070 multifunction printers with software releases before 101.00x.099.28200 allow an attacker to execute an unwanted binary during a exploited clone install. This requires creating a clone file and signing that file with a com...
    PUBLISHED: 2021-03-04
    Xerox AltaLink B8045/B8055/B8065/B8075/B8090 and C8030/C8035/C8045/C8055/C8070 multifunction printers with software releases before 101.00x.099.28200 allow a user with administrative privileges to turn off data encryption on the device, thus leaving it open to potential cryptographic information dis...
    PUBLISHED: 2021-03-03
    The Java client for the Datadog API before version 1.0.0-beta.9 has a local information disclosure of sensitive information downloaded via the API using the API Client. The Datadog API is executed on a unix-like system with multiple users. The API is used to download a file containing sensitive info...
    PUBLISHED: 2021-03-03
    resources/public/js/orchestrator.js in openark orchestrator before 3.2.4 allows XSS via the orchestrator-msg parameter.
    PUBLISHED: 2021-03-03
    GLPI is open source software which stands for Gestionnaire Libre de Parc Informatique and it is a Free Asset and IT Management Software package. In GLPI before verison 9.5.4, there is a vulnerability within the document upload function (Home > Management > Documents > Add, or /front/documen...