CVE-2020-7247 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.html http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.html http://packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.html http://packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.html http://seclists.org/fulldisclosure/2020/Jan/49 http://www.openwall.com/lists/oss-security/2020/01/28/3 https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/ https://seclists.org/bugtraq/2020/Jan/51 https://usn.ubuntu.com/4268-1/ https://www.debian.org/security/2020/dsa-4611 https://www.kb.cert.org/vuls/id/390745 https://www.openbsd.org/security.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8