By John Leyden
7th February 2008
The number of software vulnerabilities discovered last year dropped last
year after several years of growth.
But although the absolute number of software bugs unearthed last year
slipped by 5.4 per cent compared to 2006, the number of high-priority
vulnerabilities increased by 28 per cent, according to a preliminary
analysis of bugs by the X-Force group in IBM's ISS security division. By
comparison, the volume of vulnerabilities discovered in the previous two
years increased by 41 per cent year-on-year.
"2005 and 2006 saw large spikes in vulnerability growth (approximately
41 per cent each year) that were well above the X-Force Database
historical average (27 per cent a year). The drop [in 2007] could
represent an anomaly, a statistical correction or a new trend in the
amount of disclosures," X-Force researchers note.
X-Force researchers reckon the increased percentage of high-impact vulns
among the smaller sample may be due to researchers focusing on finding
more difficult, high-priority bugs.
Although X-Force's findings are open to different interpretations they
do fall in line with findings from Microsoft published last October,
looking at the first half of 2007. The software giant noted a drop in
the number of vulnerabilities in the first half of 2007 along with a
rise in the prevalence of critical flaws among that reduced number.
Microsoft's analysis - based on data from the National Vulnerability
Database - found a five per cent drop in vulnerability numbers in 1H07
to around 3,600 bugs for the first six months of last year.
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