Massive surge in successful attacks caused by long remediation gap
Kenna Security has just completed an analysis of two years of vulnerability and exploit data of 50,000 organisations across the US, examining 250 million vulnerabilities and over a billion breach events at these companies for that period.  The main conclusion is depressing: that is takes companies far too long to fix flaws once they have been discovered, with the remediation gap averaging 100-120 days. To make matters worse, the probability of that flaw being exploited rises by 90% by the time it has been known about for 40-60 days. Meanwhile the sheer volume of exploits has exploded in 2015: 220 million successful exploits were found in the period 2013-14, but year-to-date the number has risen to﻿ 1.2 billion and continues to﻿ accelerate.

As impactful as targeted attacks can be on organizations when they hit the mark, non-targeted and automated attacks that focus on known vulnerabilities still pose a significant threat to the enterprise. According to a new study out today by Kenna security, the volume of vulnerabilities exploited by untargeted attacks only continues to snowball while organizations continue to fall down in remediating these known vulnerabilities.

“The public has grown plenty familiar with hackers seeking out a specialized target, such as Ashley Madison. But automated, non-targeted attacks still remain the most significant threat to businesses of all sizes,” said Karim Toubba, CEO of Kenna.

Kenna took a deep dive into vulnerability and exploit data from 50,000 organizations over the course of a nearly two-year period from January 2014 to September 2015. It looked at 250 million vulnerabilities and over a billion breach events at these companies and confirmed something most security pros have been warning about for years: organizations taking way too long to remediate their vulnerabilities. The firm found that it takes an average of between 100 to 120 days to patch a flaw once it's found. Meanwhile, the probability of a vulnerability being exploited rises to 90 percent by the time the flaw has been known for between 40 to 60 days.

It's no surprise, then, that the volume of exploits has exploded in 2015. Kenna found that successful exploits rose over four-fold this year. The firm witnessed more than 1.2 billion successful exploits in 2015, compared to just 220 million successful exploits in 2013 and 2014 combined.

In many cases the most successful automated campaigns home in on vulnerabilities left open for far longer than the average 120 day remediation window.

"When we talk about unremediated vulnerabilities that fall prey to attacks at scale, one of the points we need to make is that the vulnerabilities in question are often very old, well-known weaknesses that simply haven’t been fixed yet," the report said. "We’ve seen this over and over again as we evaluate the data."

For example, the report detailed how the positively ancient Slammer vulnerability in SQL Server 2000 still provides fodder for automated attacks. In 2014 Kenna found evidence that it was successfully exploited 156,000 times.

"It’s not new, it’s not hip, it’s not current, so one talks about it – but it’s a significant threat," the report said.

That's, of course, the very long tail of exploitation. More recent, but still well-known vulnerabilities like Heartbleed are proving even more useful to attackers. Based on its data, Kenna predicts that over the next month there will be 5000 successful exploitations of Heartbleed per day