Ubuntu Security Notice 400-1 - Georgi Guninski and David Bienvenu discovered that long Content-Type and RFC2047-encoded headers we vulnerable to heap overflows. By tricking the user into opening a specially crafted email, an attacker could execute arbitrary code with user privileges. Various flaws have been reported that allow an attacker to execute arbitrary code with user privileges or bypass internal XSS protections by tricking the user into opening a malicious email containing JavaScript. Please note that JavaScript is disabled by default for emails, and it is not recommended to enable it.
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