VulnerabilityAnalyzed
CVE-2020-7247
OpenSMTPD Remote Code Execution Vulnerability
KEVCRITICAL 9.8EPSS 99.0%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 15 April 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 98.97% probability · 100th percentile
- CISA KEV
- Listed 25 March 2022 · due 15 April 2022
- Weakness
- CWE-78, CWE-755
- Affected
- openbsd/opensmtpd · debian/debian linux · fedoraproject/fedora · canonical/ubuntu linux
- Source
- cve@mitre.org
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2020-7247
References
- http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.htmlBroken Link, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2020/Jan/49Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/01/28/3Exploit, Mailing List, Third Party Advisory
- https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45Patch
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2020/Jan/51Mailing List, Third Party Advisory
- https://usn.ubuntu.com/4268-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4611Mailing List, Third Party Advisory
- https://www.kb.cert.org/vuls/id/390745Third Party Advisory, US Government Resource
- https://www.openbsd.org/security.htmlPatch, Vendor Advisory
- http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.htmlBroken Link, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2020/Jan/49Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/01/28/3Exploit, Mailing List, Third Party Advisory
- https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45Patch
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2020/Jan/51Mailing List, Third Party Advisory
- https://usn.ubuntu.com/4268-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4611Mailing List, Third Party Advisory
- https://www.kb.cert.org/vuls/id/390745Third Party Advisory, US Government Resource
- https://www.openbsd.org/security.htmlPatch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-7247US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.