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Description
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A weakness and two vulnerabilities have been reported in Bugzilla, which can be exploited by malicious users to bypass certain security restrictions and conduct script insertion attacks and by malicious people to conduct cross-site scripting attacks.
1) An error due to the "User.offer_account_by_email" method not properly checking the "user_can_create_account" value before sending account creation emails can be exploited to create a new user account.
2) Input passed to e.g. the "label0" parameter in chart.cgi (when "debug" is set to "1") is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
3) Certain input passed to report.cgi when changing the Real Name is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when the malicious data is being viewed.
Please see the vendor's advisory for a list of affected versions.
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