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.


Ireland's Largest ISP May Be Under Attack

'Unprecedented volume of traffic' deliberately directed at Eircom, officials say

Ireland's largest Internet service provider has been experiencing performance problems for more than a month, and some researchers believe it has become the victim of multiple DNS poisoning attacks.

Users first began complaining of slow response times at the end of May, according to online bulletin boards. Some users also complained that their Web queries were being redirected to other sites. Many of those queries ended up at the same advertising site, which suggests a DNS compromise, according to a blog by Rik Ferguson, a security researcher at Trend Micro.

Complaints from Eircom users reportedly intensified at the beginning of July, and last week the ISP issued a statement that confirmed the problem:

"Customers may have recently experienced delays in web browsing and may have been unable to access the Internet," the statement said. "In some cases, customers may have been redirected to incorrect Websites. This issue has been caused by an unusual and irregular volume of internet traffic being directed onto our network, and this impacted the systems and servers that provide access to the Internet for our customers.

"Eircom is working continuously to minimize the impact for customers and has taken a number of steps, including software updates and hardware interventions, to fully restore Internet service."

But this week, users again are reporting problems using the ISP's services. In a second statement issued July 14, the ISP conceded that the problem may be a second attack. "While it is too early to confirm, Eircom believes that [this week's performance issues are] related to an unprecedented volume of traffic deliberately directed at our network which has caused difficulties for customers over recent days," the company says.

Eircom stopped short of discussing the actual nature of the attacks, but both Ferguson's blog and multiple bulletin board users are reporting that the performance problems and site redirections can be mitigated if users switch to another Domain Name Server (DNS) service, such as OpenDNS. These reports provide further evidence that Eircom has become the victim of DNS poisoning, possibly more than once.

The problems at Eircom reinforce the need for a solution to the DNS vulnerabilities that came to light two years ago, necessitating an industrywide patching effort, researchers say. Many ISPs and large enterprises are moving to DNS SEC, which may help alleviate the problem, they say.

Have a comment on this story? Please click "Discuss" below. If you'd like to contact Dark Reading's editors directly, send us a message. Tim Wilson is Editor in Chief and co-founder of Dark Reading.com, UBM Tech's online community for information security professionals. He is responsible for managing the site, assigning and editing content, and writing breaking news stories. Wilson has been recognized as one ... View Full Bio


Recommended Reading:

Comment  | 
Print  | 
More Insights
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 8/3/2020
Pen Testers Who Got Arrested Doing Their Jobs Tell All
Kelly Jackson Higgins, Executive Editor at Dark Reading,  8/5/2020
New 'Nanodegree' Program Provides Hands-On Cybersecurity Training
Nicole Ferraro, Contributing Writer,  8/3/2020
Register for Dark Reading Newsletters
White Papers
Cartoon Contest
Current Issue
Special Report: Computing's New Normal, a Dark Reading Perspective
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
The Changing Face of Threat Intelligence
The Changing Face of Threat Intelligence
This special report takes a look at how enterprises are using threat intelligence, as well as emerging best practices for integrating threat intel into security operations and incident response. Download it today!
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
PUBLISHED: 2020-08-10
A function in Combodo iTop contains a vulnerability of Broken Access Control, which allows unauthorized attacker to inject command and disclose system information.
PUBLISHED: 2020-08-10
Combodo iTop does not validate inputted parameters, attackers can inject malicious commands and launch XSS attack.
PUBLISHED: 2020-08-10
Combodo iTop contains a stored Cross-site Scripting vulnerability, which can be attacked by uploading file with malicious script.
PUBLISHED: 2020-08-10
A security misconfiguration exists in Combodo iTop, which can expose sensitive information.
PUBLISHED: 2020-08-10
Combodo iTop contains a cross-site request forgery (CSRF) vulnerability, attackers can execute specific commands via malicious site request forgery.