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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 metacharacters 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.

• https://www.openbsd.org/security.html x_refsource_CONFIRM
• http://www.openwall.com/lists/oss-security/2020/01/28/3 x_refsource_MISC
• https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45 x_refsource_CONFIRM
• http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.html x_refsource_MISC
• https://seclists.org/bugtraq/2020/Jan/51 mailing-listx_refsource_BUGTRAQ
• https://www.debian.org/security/2020/dsa-4611 vendor-advisoryx_refsource_DEBIAN
• http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.html x_refsource_MISC
• https://www.kb.cert.org/vuls/id/390745 third-party-advisoryx_refsource_CERT-VN
• http://seclists.org/fulldisclosure/2020/Jan/49 mailing-listx_refsource_FULLDISC
• http://packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.html x_refsource_MISC
• http://packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.html x_refsource_MISC
• https://usn.ubuntu.com/4268-1/ vendor-advisoryx_refsource_UBUNTU
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/ vendor-advisoryx_refsource_FEDORA
• http://packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.html x_refsource_MISC
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-7247 government-resource