CVE-2020-7247

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.

References

• packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.html · Exploit, Third Party Advisory, VDB Entry
• packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.html · Exploit, Third Party Advisory, VDB Entry
• packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.html · Exploit, Third Party Advisory, VDB Entry
• packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.html · Exploit, Third Party Advisory, VDB Entry
• packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.html · Broken Link, Third Party Advisory, VDB Entry
• seclists.org/fulldisclosure/2020/Jan/49 · Exploit, Mailing List, Third Party Advisory
• www.openwall.com/lists/oss-security/2020/01/28/3 · Exploit, Mailing List, Third Party Advisory
• github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45 · Patch
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/ · Mailing List, Third Party Advisory
• seclists.org/bugtraq/2020/Jan/51 · Mailing List, Third Party Advisory
• usn.ubuntu.com/4268-1/ · Third Party Advisory
• www.debian.org/security/2020/dsa-4611 · Mailing List, Third Party Advisory
• www.kb.cert.org/vuls/id/390745 · Third Party Advisory, US Government Resource
• www.openbsd.org/security.html · Patch, Vendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-7247 · US Government Resource