Attacks/Breaches

11/29/2016
04:20 PM
Connect Directly
Twitter
LinkedIn
RSS
E-Mail
100%
0%

Deutsche Telekom Attacks Suggest Mirai Threat Poised To Become Much Larger

With attack, Mirai has added an exploit targeting Web service vulnerability.

A cyberattack that crippled Internet services for nearly one million customers of Deutsche Telekom earlier this week suggests that the threat posed by the Mirai IoT botnet malware is about to get a lot larger.

The attack is the first since Mirai surfaced in October that does not rely on weak and default passwords in routers, webcams, digital video recorders, and other so-called Internet of Things devices.

Instead it targeted a specific vulnerability in a management interface present in routers used by many customers of Deutsche Telekom with the goal of infecting the devices and making them part of a Mirai botnet. The infection attempts failed but nevertheless caused the routers to crash.

“Until now, Mirai just used weak passwords to exploit devices like routers. But with this version, it adds an exploit for a vulnerability in a web service,” says Johannes Ullrich, dean of research at the SANS Institute.

The kind of vulnerability that was exploited in the attack is very common, he says. “What we see right now is more or less just a tip of the iceberg. By adding this exploit, Mirai gained access to many more devices then it already had,” he said.

The disruptions for Deutsche Telekom customers started Sunday and continued through parts of early Monday. In all, about 900,000 customers, representing about 4% of the company’s 20 million fixed-line customers, were impacted in the attack, Deutsche Telekom said in a FAQ and alert on the incident.

By early Monday, the company had begun rolling out patches for the problem to affected customers. It advised customers to unplug their router for 30 seconds and then power the device back on for the update to take hold. It also offered a location where users could go to download the update manually and install it on their routers.

The fact that threat actors are attempting to distribute Mirai by exploiting software vulnerabilities in IoT devices is troubling, says Craig Young, security researcher at Tripwire.

“The most defining attribute is that this Mirai variant is propagating through a specific vulnerability rather than relying on poorly configured devices,” Young says. “The last wave of attacks would seek out devices with exposed Telnet or SSH management and attempt to guess passwords.”

Device owners could easily thwart such attacks by using a strong password or not directly exposing the management service to the Internet, Young says.

In contrast “this attack could not be blocked through any configuration change made by the end user,” Young says. “The management protocol being attacked is exposed in the device configuration required by various ISPs and is not one that consumers could disable,” on their own without a vendor-supplied patch, Young says.

In a SANS Internet Storm Center advisory, Ullrich identified the Deutsche Telekom routers that were attacked as originating from Acadyn, a Taiwanese modem manufacturer. But the vulnerable interface is present in other routers as well, including those from Zyxel, a maker of modems used by Irish ISP Eir, Ullrich said in the alert.

A count performed using the Shodan Internet scanning tool shows the total number of devices listening in on the port used by the management interface is as large as 40 million. But not all of them are likely to run the vulnerable implementations that were present in the Deutsche Telekom routers. “My personal "best guess" is that this vulnerability may have added 1-2 Million new bots to the Mirai botnet,” Ullrich wrote in the alert.

Related stories:

 

Jai Vijayan is a seasoned technology reporter with over 20 years of experience in IT trade journalism. He was most recently a Senior Editor at Computerworld, where he covered information security and data privacy issues for the publication. Over the course of his 20-year ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Crowdsourced vs. Traditional Pen Testing
Alex Haynes, Chief Information Security Officer, CDL,  3/19/2019
BEC Scammer Pleads Guilty
Dark Reading Staff 3/20/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
5 Emerging Cyber Threats to Watch for in 2019
Online attackers are constantly developing new, innovative ways to break into the enterprise. This Dark Reading Tech Digest gives an in-depth look at five emerging attack trends and exploits your security team should look out for, along with helpful recommendations on how you can prevent your organization from falling victim.
Flash Poll
The State of Cyber Security Incident Response
The State of Cyber Security Incident Response
Organizations are responding to new threats with new processes for detecting and mitigating them. Here's a look at how the discipline of incident response is evolving.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2018-18913
PUBLISHED: 2019-03-21
Opera before 57.0.3098.106 is vulnerable to a DLL Search Order hijacking attack where an attacker can send a ZIP archive composed of an HTML page along with a malicious DLL to the target. Once the document is opened, it may allow the attacker to take full control of the system from any location with...
CVE-2018-20031
PUBLISHED: 2019-03-21
A Denial of Service vulnerability related to preemptive item deletion in lmgrd and vendor daemon components of FlexNet Publisher version 11.16.1.0 and earlier allows a remote attacker to send a combination of messages to lmgrd or the vendor daemon, causing the heartbeat between lmgrd and the vendor ...
CVE-2018-20032
PUBLISHED: 2019-03-21
A Denial of Service vulnerability related to message decoding in lmgrd and vendor daemon components of FlexNet Publisher version 11.16.1.0 and earlier allows a remote attacker to send a combination of messages to lmgrd or the vendor daemon, causing the heartbeat between lmgrd and the vendor daemon t...
CVE-2018-20034
PUBLISHED: 2019-03-21
A Denial of Service vulnerability related to adding an item to a list in lmgrd and vendor daemon components of FlexNet Publisher version 11.16.1.0 and earlier allows a remote attacker to send a combination of messages to lmgrd or the vendor daemon, causing the heartbeat between lmgrd and the vendor ...
CVE-2019-3855
PUBLISHED: 2019-03-21
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.