CVE-2020-7247

OpenSMTPD Remote Code Execution Vulnerability

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

*SSVC

Descriptions

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.

La función smtp_mailaddr en el archivo smtp_session.c en OpenSMTPD versión 6.6, como es usado en OpenBSD versión 6.6 y otros productos, permite a atacantes remotos ejecutar comandos arbitrarios como root por medio de una sesión SMTP diseñada, como es demostrado por metacaracteres de shell en un campo MAIL FROM. Esto afecta la configuración predeterminada "uncommented". El problema se presenta debido a un valor de retorno incorrecto tras un fallo en la comprobación de entrada.

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 meta-characters 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.

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.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-01-20 CVE Reserved
2020-01-28 First Exploit
2020-01-29 CVE Published
2022-03-25 Exploited in Wild
2022-04-15 KEV Due Date
2024-07-17 EPSS Updated
2024-08-04 CVE Updated

CWE

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-755: Improper Handling of Exceptional Conditions

CAPEC

References (24)

URL	Tag	Source
http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.html	Third Party Advisory
http://packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.html	Broken Link
http://seclists.org/fulldisclosure/2020/Jan/49	Mailing List
https://seclists.org/bugtraq/2020/Jan/51	Mailing List
https://www.kb.cert.org/vuls/id/390745	Third Party Advisory
https://seclists.org/oss-sec/2020/q1/40

URL	Date	SRC
https://www.exploit-db.com/exploits/47984	2020-01-30
https://www.exploit-db.com/exploits/48038	2020-02-10
https://www.exploit-db.com/exploits/48051	2020-02-11
https://github.com/QTranspose/CVE-2020-7247-exploit	2021-02-17
https://github.com/bytescrappers/CVE-2020-7247	2021-02-01
https://github.com/r0lh/CVE-2020-7247	2020-02-18
https://github.com/SimonSchoeni/CVE-2020-7247-POC	2022-01-20
https://github.com/f4T1H21/CVE-2020-7247	2021-07-10
http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.html	2024-08-04
http://packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.html	2024-08-04
http://packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.html	2024-08-04
http://www.openwall.com/lists/oss-security/2020/01/28/3	2024-08-04
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/smtp/opensmtpd_mail_from_rce.rb	2020-01-28

URL	Date	SRC
https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45	2023-11-07
https://www.openbsd.org/security.html	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E	2023-11-07
https://usn.ubuntu.com/4268-1	2023-11-07
https://www.debian.org/security/2020/dsa-4611	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openbsd Search vendor "Openbsd"		Opensmtpd Search vendor "Openbsd" for product "Opensmtpd"				6.6 Search vendor "Openbsd" for product "Opensmtpd" and version "6.6"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"		-		Affected