Alan Rad Pop of Secunia Research discovered the following two vulnerabilities in Evolution: Evolution did not properly validate timezone data when processing iCalendar attachments. If a user disabled the Itip Formatter plugin and viewed a crafted iCalendar attachment, an attacker could cause a denial of service or potentially execute arbitrary code with the user"s privileges . Evolution also did not properly validate the DESCRIPTION field when processing iCalendar attachments. If a user were tricked into accepting a crafted iCalendar attachment and replied to it from the calendar window, an attacker could cause a denial of service or potentially execute arbitrary code with the user"s privileges . In addition, Matej Cepl found that Evolution did not properly validate date fields when processing iCalendar attachments, which could lead to a denial of service if the user viewed a crafted iCalendar attachment with the Itip Formatter plugin disabled. Mandriva Linux has the Itip Formatter plugin enabled by default. The updated packages have been patched to prevent these issues.