Buggy avast Definitions Update blocked legitimate websites on system
Last night avast users faced a serious problem when antivirus started detecting infections on all websites after a bad buggy definition update. The problem was with 110411-1 definition update. After 45 min of this issue company released another definition update 110411-2.
According to sources, after seeing the warnings, some people restarted their computers and initiated boot-time scan. This scan takes place before Windows loads, detected infections in local html and javascript files and moved them to the virus chest (quarantine).
Some people were able restore them after installing the new definition update, but others uninstalled avast! after the boot-time scan didn't resolve the problem, leading to their permanent loss.
This was not the first time when an antivirus created a problem for users due to buggy update. In the past, products from other companies have deleted critical system files as a result of bad definitions, leaving hundreds of thousands of computers crippled or even unable to boot into the operating system at all.
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