OpenSMTPD 6.6.1 Local Privilege Escalation
Posted by deepcore on February 12, 2020 – 5:28 am
smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell meta-characters in a MAIL FROM field. This affects the “uncommented” default configuration. The issue exists because of an incorrect return value upon failure of input validation.
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