CVE-2023-51765

Published: 24 December 2023

sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.

Priority

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package	Release	Status
sendmail Launchpad, Ubuntu, Debian	bionic	Needs triage
	focal	Needs triage
	jammy	Needs triage
	lunar	Ignored (end of life, was needs-triage)
	mantic	Needs triage
	noble	Not vulnerable (code not present)
	trusty	Needs triage
	upstream	Released (8.18.1-1)
	xenial	Needs triage

Severity score breakdown

Parameter	Value
Base score	5.3
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1059386

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