Fixes #6580 - XSS in operating system name/description (CVE-2014-3531) #1580
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The problem here is a misuse of .html_safe
.html_safe just turns the String into a SafeBuffer.
That doesn't escape anything, but if we append anything to that string, the new string will be escaped.
It's useful to avoid concatenations of tags, for instance one string ending with "<script>" and another one starting with "alert(1)</script>" will not concatenate into a real script.
In short, html_safe does not sanitize the input, it just tells Rails the string is "html_safe", but prevents future concatenations to make it unsafe.
"#{icon(record, opts)} #{record.to_label}".html_safe
comes from user input and is not safe.The current patch assumes 'family' in OS is safe. It does not come from user input but from a hash in the source app/models/operatingsystem.rb so I think it should be OK.