CVE-2020-7247
CRITICAL severity · CVSS 9.8 · OS command injection · actively exploited (CISA KEV)
9.8CVSS CRITICAL exploited
Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2022-03-25. US federal agencies must patch by 2022-04-15.
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)99%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Official patch: https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45 ↗
Additional information
- NVD record
- https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45Patch
- http://packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.htmlAdvisory
- http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.htmlAdvisory
- http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.htmlAdvisory
- http://packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.htmlAdvisory
- http://packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.htmlAdvisory
- http://seclists.org/fulldisclosure/2020/Jan/49Advisory
- http://www.openwall.com/lists/oss-security/2020/01/28/3Advisory