Memcached DDoS Attack: Kill Switch, New Details Disclosed

Corero shares a kill switch for the Memcached vulnerability and reports the flaw is more extensive than originally believed.

Dark Reading Staff, Dark Reading

March 7, 2018

2 Min Read
Dark Reading logo in a gray background | Dark Reading

Corero Network Security has disclosed a "kill switch" for the Memcached vulnerability to national security agencies and shared new evidence indicating the flaw is more dangerous than previously believed. For the first time, threat actors have been exploiting unsecured Memcached servers to launch distributed denial-of-service (DDoS) attacks on target businesses.

Memcached is an open-source memory caching system that stores data in RAM to accelerate access times. It was not built for Internet access; users don't have to authenticate. This exploit lets attackers create spoof requests and boost attacks up to 50,000 times.

The attacks, which hit businesses including GitHub, started in late February. German DDoS mitigation service provider Link11 was among the first to report the new activity, which included UDP attacks using Memcached servers to spread. Link11 found 5,000 vulnerable Memcached servers on the public internet.

Corero researchers have discovered that any exposed Memcached server that can be leveraged for a DDoS attack can also be tricked into sharing user data it has cached from its local network or host. Because Memcached servers don't require authentication, anything added to a vulnerable server can be stolen. Attackers can also modify data and reinsert it in the cache without owners' knowledge.

The "kill switch" sends a command back to the attackers' server to suppress the current DDoS exploitation. This invalidates the cache of a vulnerable server, including attackers' potentially malicious payload. It has been effectively tested on live attacking servers, Corero reports.

Read more details here.

cropped-horizontal-bh18asia_468x60.png

 

 

 

Black Hat Asia returns to Singapore with hands-on technical Trainings, cutting-edge Briefings, Arsenal open-source tool demonstrations, top-tier solutions and service providers in the Business Hall. Click for information on the conference and to register.

About the Author

Dark Reading Staff

Dark Reading

Dark Reading is a leading cybersecurity media site.

Keep up with the latest cybersecurity threats, newly discovered vulnerabilities, data breach information, and emerging trends. Delivered daily or weekly right to your email inbox.

You May Also Like


More Insights