CVE-2023-51765

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

sendmail hasta al menos 8.14.7 permite el contrabando SMTP en ciertas configuraciones. Los atacantes remotos pueden utilizar una técnica de explotación publicada para inyectar mensajes de correo electrónico que parecen originarse en el servidor sendmail, lo que permite omitir un mecanismo de protección SPF. Esto ocurre porque sendmail admite . pero algunos otros servidores de correo electrónico populares no lo hacen.

*Credits: N/A

CVSS Scores

NISTv3.1 5.3

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-12-24 CVE Reserved
2023-12-24 CVE Published
2024-01-06 EPSS Updated
2024-08-02 CVE Updated
2024-08-02 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-345: Insufficient Verification of Data Authenticity

CAPEC

References (17)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2023/12/24/1	Mailing List
http://www.openwall.com/lists/oss-security/2023/12/25/1	Mailing List
http://www.openwall.com/lists/oss-security/2023/12/26/5	Mailing List
http://www.openwall.com/lists/oss-security/2023/12/29/5	Mailing List
http://www.openwall.com/lists/oss-security/2023/12/30/1	Mailing List
http://www.openwall.com/lists/oss-security/2023/12/30/3	Mailing List
https://access.redhat.com/security/cve/CVE-2023-51765	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2255869	Issue Tracking
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html	Technical Description
https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html	Mailing List
https://lwn.net/Articles/956533
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide	Technical Description
https://www.openwall.com/lists/oss-security/2023/12/21/7	Mailing List
https://www.openwall.com/lists/oss-security/2023/12/22/7	Mailing List

URL	Date	SRC
https://www.youtube.com/watch?v=V8KPV96g1To	2024-08-02

URL	Date	SRC
https://bugzilla.suse.com/show_bug.cgi?id=1218351	2024-06-15
https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc	2024-06-15

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Sendmail Search vendor "Sendmail"		Sendmail Search vendor "Sendmail" for product "Sendmail"				< 8.18.0.2 Search vendor "Sendmail" for product "Sendmail" and version " < 8.18.0.2"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				< 11.0 Search vendor "Freebsd" for product "Freebsd" and version " < 11.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected