CVE-2023-51765

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 61%
Affected Products (NVD)
VendorProductVersion
sendmailsendmail
𝑥
< 8.18.0.2
freebsdfreebsd
𝑥
< 11.0
redhatenterprise_linux
8.0
redhatenterprise_linux
9.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
sendmail
bookworm
8.17.1.9-2+deb12u2
fixed
bullseye
8.15.2-22+deb11u3
fixed
sid
8.18.1-6
fixed
trixie
8.18.1-6
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
sendmail
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
lunar
ignored
mantic
ignored
noble
not-affected
oracular
not-affected
trusty
ignored
xenial
needs-triage
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
sendmail
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
sendmail-cf
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
sendmail-debuginfo
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
sendmail-debugsource
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
sendmail-doc
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
sendmail-milter
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
sendmail-milter-debuginfo
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
sendmail-milter-devel
Amazon Linux 2023
0:8.18.2-2.amzn2023.0.1
fixed
Common Weakness Enumeration
References
http://www.openwall.com/lists/oss-security/2023/12/24/1
http://www.openwall.com/lists/oss-security/2023/12/25/1
http://www.openwall.com/lists/oss-security/2023/12/26/5
http://www.openwall.com/lists/oss-security/2023/12/29/5
http://www.openwall.com/lists/oss-security/2023/12/30/1
http://www.openwall.com/lists/oss-security/2023/12/30/3
https://access.redhat.com/security/cve/CVE-2023-51765
https://bugzilla.redhat.com/show_bug.cgi?id=2255869
https://bugzilla.suse.com/show_bug.cgi?id=1218351
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc
https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
https://lwn.net/Articles/956533/
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/21/7
https://www.openwall.com/lists/oss-security/2023/12/22/7
https://www.youtube.com/watch?v=V8KPV96g1To
http://www.openwall.com/lists/oss-security/2023/12/24/1
http://www.openwall.com/lists/oss-security/2023/12/25/1
http://www.openwall.com/lists/oss-security/2023/12/26/5
http://www.openwall.com/lists/oss-security/2023/12/29/5
http://www.openwall.com/lists/oss-security/2023/12/30/1
http://www.openwall.com/lists/oss-security/2023/12/30/3
https://access.redhat.com/security/cve/CVE-2023-51765
https://bugzilla.redhat.com/show_bug.cgi?id=2255869
https://bugzilla.suse.com/show_bug.cgi?id=1218351
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc
https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
https://lwn.net/Articles/956533/
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/21/7
https://www.openwall.com/lists/oss-security/2023/12/22/7
https://www.youtube.com/watch?v=V8KPV96g1To