OpenBSD · OpenSMTPD
CVE-2020-7247
OpenSMTPD Remote Code Execution Vulnerability
What it is
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.
CISA: smtp_mailaddr in smtp_session.c in OpenSMTPD, as used in OpenBSD and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: April 15, 2022
- Added to the CISA list
- March 25, 2022
- Published
- January 29, 2020
- Severity
- Critical 9.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 99% in the top 0.1% of all known vulnerabilities
- Weakness
- CWE-755 CWE-78
- More details
- NVD · CVE.org · CISA
All references (14)
- https://www.debian.org/security/2020/dsa-4611
- https://usn.ubuntu.com/4268-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA…
- https://www.openbsd.org/security.html
- http://www.openwall.com/lists/oss-security/2020/01/28/3
- https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45
- http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.html
- https://seclists.org/bugtraq/2020/Jan/51
- http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.html
- https://www.kb.cert.org/vuls/id/390745
- http://seclists.org/fulldisclosure/2020/Jan/49
- 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://packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.html
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.