CVE-2023-51766

Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING 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 Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
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
mitreCNA
---
---
CVEADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 86%
VendorProductVersion
eximexim
𝑥
< 4.97.1
fedoraprojectextra_packages_for_enterprise_linux
7.0
fedoraprojectextra_packages_for_enterprise_linux
8.0
fedoraprojectextra_packages_for_enterprise_linux
9.0
debiandebian_linux
10.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
exim4
bullseye
4.94.2-7+deb11u3
fixed
bullseye (security)
4.94.2-7+deb11u4
fixed
bookworm
4.96-15+deb12u6
fixed
bookworm (security)
4.96-15+deb12u5
fixed
sid
4.98-3
fixed
trixie
4.98-3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
exim4
oracular
Fixed 4.97-3
released
noble
Fixed 4.97-3
released
mantic
Fixed 4.96-17ubuntu2.2
released
lunar
ignored
jammy
Fixed 4.95-4ubuntu2.5
released
focal
Fixed 4.93-13ubuntu1.10
released
bionic
Fixed 4.90.1-1ubuntu1.10+esm3
released
xenial
Fixed 4.86.2-2ubuntu2.6+esm6
released
trusty
ignored
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/2023/12/29/2
http://www.openwall.com/lists/oss-security/2024/01/01/1
http://www.openwall.com/lists/oss-security/2024/01/01/2
http://www.openwall.com/lists/oss-security/2024/01/01/3
https://bugs.exim.org/show_bug.cgi?id=3063
https://bugzilla.redhat.com/show_bug.cgi?id=2255852
https://exim.org/static/doc/security/CVE-2023-51766.txt
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766
https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/
https://lwn.net/Articles/956533/
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/23/2
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/2023/12/29/2
http://www.openwall.com/lists/oss-security/2024/01/01/1
http://www.openwall.com/lists/oss-security/2024/01/01/2
http://www.openwall.com/lists/oss-security/2024/01/01/3
https://bugs.exim.org/show_bug.cgi?id=3063
https://bugzilla.redhat.com/show_bug.cgi?id=2255852
https://exim.org/static/doc/security/CVE-2023-51766.txt
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766
https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/
https://lwn.net/Articles/956533/
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/23/2
https://www.youtube.com/watch?v=V8KPV96g1To