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The issue exists because of an incorrect return value upon failure of input validation."},{"lang":"es","value":"La función smtp_mailaddr en el archivo smtp_session.c en OpenSMTPD versión 6.6, como es usado en OpenBSD versión 6.6 y otros productos, permite a atacantes remotos ejecutar comandos arbitrarios como root por medio de una sesión SMTP diseñada, como es demostrado por metacaracteres de shell en un campo MAIL FROM. Esto afecta la configuración predeterminada \"uncommented\". El problema se presenta debido a un valor de retorno incorrecto tras un fallo en la comprobación de 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