A new denial-of-service attack dubbed 'Loop DoS' targeting application layer protocols can pair network services into an indefinite communication loop that creates large volumes of traffic.

DR-DOS 5 then was important because it added support for HMA and UMBs. It had a GUI named ViewMax, which was a cutdown GEM 3. DR-DOS was so good that Microsoft was forced to released MS-DOS 5.

In a DoS attack, the attacker sends a flood of superfluous requests to the website’s main server, which basically overloads it and blocks out any further requests before the capacity is retained.

Discovered by CISPA researchers Yepeng Pan and Professor Dr. Christian Rossow, application-layer loop DoS attacks are likely to concern a total of 300,000 Internet hosts.

This is relevant because DR-DOS is a derivative of CP/M – specifically of CP/M-86. Most of DR-DOS remains proprietary, but ...