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.

IoT
6/26/2019
05:30 PM
50%
50%

New Linux Worm Attacks IoT Devices

Silex has 'bricked' more than 2,000 Linux-based IoT devices so far.

A new Internet of Things (IoT) bricking worm — malware designed to permanently disable the hardware it infects — is hitting Linux-based devices, and it appears the culprit responsible for the attack is 14 years old. 

The new software, dubbed "Silex," is running across the Internet looking for Linux systems deployed with default admin credentials. Once it finds such a system, it overwrites all of the system's storage with random data, drops its firewall rules, removes its network configuration, and then restarts the system — effectively rendering the device useless.

Discovered by Larry Cashdollar, a vulnerability researcher and member of Akamai's Security Incident Response Team, the software is purely destructive; it captures no data and asks for no ransom. Researcher Ankit Anubhav traced the malware back to its origins and found the developer, who uses the online name "Light Leafon." According to Anubhav, the malware's author says that additional destructive capabilities are planned for future Silex variants.

More than 2,000 systems have already been damaged by Silex, which is not technically limited to IoT devices. It could attack any Linux system deployed on the Internet with open telnet ports and default admin credentials. Other researchers have noted that the command-and-control servers for Silex have IP addresses linked to Iran, leading some to speculate that political, as well as simply destructive, aims are behind its release.

Read more herehere, and here.

Dark Reading's Quick Hits delivers a brief synopsis and summary of the significance of breaking news events. For more information from the original source of the news item, please follow the link provided in this article. View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
<<   <   Page 2 / 2
Webtoolsoffers
50%
50%
Webtoolsoffers,
User Rank: Apprentice
6/28/2019 | 4:31:00 AM
Re: Linux Worm Exploits and Defenses
The IoT devices related to the internet. Now-a-day IoT devices is most useful because we can get information through mobile interenet
tdsan
50%
50%
tdsan,
User Rank: Ninja
6/27/2019 | 2:52:55 PM
Linux Worm Exploits and Defenses
The new software, dubbed "Silex," is running across the Internet looking for Linux systems deployed with default admin credentials. Once it finds such a system, it overwrites all of the system's storage with random data, drops its firewall rules, removes its network configuration, and then restarts the system — effectively rendering the device useless.

I do agree the responsibility should rest with the consumer where the system asks or provides insight on how to change the admin password but this should be a mandatory function (to change the password and remove telnet or disable it) when the user logs in. A number of companies are doing this but after reading the report, it seems this practice is not performed across the board.

 
It could attack any Linux system deployed on the Internet with open telnet ports and default admin credentials.

Ways to thwart the linux attack:
  • iptables -I INPUT 1 -m multiport --dport 23 -s 0.0.0.0/0 -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j DROP (the code can be updated to include more ports (-m option), conntrack tracks the attempts and the --ctstate looks for NEW, ESTABLISHED and Relates sessions, the -J is used to drop the connection)
  • ufw deny in -proto tcp from 0.0.0.0/0 to 0.0.0.0/0 port 23 "comment Deny telnet access" or a shorter method is ufw deny in telnet.
  • Firewall - disable telnet from the IOT device or only allow internal access when needed if telnet is essential to diagnostic issues
  • Another option would be to stop the service all together
service stop telnet-server or systemctl stop telnet-server

 

Shodan provides a complete list of devices that still have default passwords enabled.

 Todd

 
<<   <   Page 2 / 2
Microsoft Patches Wormable RCE Vulns in Remote Desktop Services
Kelly Sheridan, Staff Editor, Dark Reading,  8/13/2019
The Mainframe Is Seeing a Resurgence. Is Security Keeping Pace?
Ray Overby, Co-Founder & President at Key Resources, Inc.,  8/15/2019
GitHub Named in Capital One Breach Lawsuit
Dark Reading Staff 8/14/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
7 Threats & Disruptive Forces Changing the Face of Cybersecurity
This Dark Reading Tech Digest gives an in-depth look at the biggest emerging threats and disruptive forces that are changing the face of cybersecurity today.
Flash Poll
The State of IT Operations and Cybersecurity Operations
The State of IT Operations and Cybersecurity Operations
Your enterprise's cyber risk may depend upon the relationship between the IT team and the security team. Heres some insight on what's working and what isn't in the data center.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2019-15132
PUBLISHED: 2019-08-17
Zabbix through 4.4.0alpha1 allows User Enumeration. With login requests, it is possible to enumerate application usernames based on the variability of server responses (e.g., the &quot;Login name or password is incorrect&quot; and &quot;No permissions for system access&quot; messages, or just blocki...
CVE-2019-15133
PUBLISHED: 2019-08-17
In GIFLIB before 2019-02-16, a malformed GIF file triggers a divide-by-zero exception in the decoder function DGifSlurp in dgif_lib.c if the height field of the ImageSize data structure is equal to zero.
CVE-2019-15134
PUBLISHED: 2019-08-17
RIOT through 2019.07 contains a memory leak in the TCP implementation (gnrc_tcp), allowing an attacker to consume all memory available for network packets and thus effectively stopping all network threads from working. This is related to _receive in sys/net/gnrc/transport_layer/tcp/gnrc_tcp_eventloo...
CVE-2019-14937
PUBLISHED: 2019-08-17
REDCap before 9.3.0 allows time-based SQL injection in the edit calendar event via the cal_id parameter, such as cal_id=55 and sleep(3) to Calendar/calendar_popup_ajax.php. The attacker can obtain a user's login sessionid from the database, and then re-login into REDCap to compromise all data.
CVE-2019-13069
PUBLISHED: 2019-08-17
extenua SilverSHielD 6.x fails to secure its ProgramData folder, leading to a Local Privilege Escalation to SYSTEM. The attacker must replace SilverShield.config.sqlite with a version containing an additional user account, and then use SSH and port forwarding to reach a 127.0.0.1 service.