CVE-2020-7247

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.

From the Ubuntu Security Team

It was discovered that OpenSMTPD incorrectly verified the sender's or receiver's e-mail addresses under certain conditions. An attacker could use this vulnerability to execute arbitrary commands as root.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
opensmtpd	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Fixed 6.0.3p1-6ubuntu0.1
	18.04 LTS bionic	Fixed 6.0.3p1-1ubuntu0.1
	16.04 LTS xenial	Fixed 5.7.3p2-1ubuntu0.1~esm1 Ubuntu Pro
	14.04 LTS trusty	Fixed 5.4.1p1-1ubuntu0.1~esm1 Ubuntu Pro

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
opensmtpd	Upstream: 9dcfda0

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Cvss 3 Severity Score

From the Ubuntu Security Team

Status

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Patch details

Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references