CVE-2023-51766

Sažetak

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.

Reference

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

CVSS

Base:	5.3
Impact:	1.4
Exploitability:	3.9

Pristup

Vektor	Složenost	Autentikacija
NETWORK	LOW	NONE

Impact

Povjerljivost	Cjelovitost	Dostupnost
NONE	LOW	NONE

CVSS vektor

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Zadnje važnije ažuriranje

02-02-2024 - 02:22

Objavljeno

24-12-2023 - 06:15