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Test ID:1.3.6.1.4.1.25623.1.0.114256
Category:SMTP problems
Title:Sendmail < 8.18 SMTP Smuggling Vulnerability (Dec 2023)
Summary:Sendmail is prone to a SMTP smuggling vulnerability.
Description:Summary:
Sendmail is prone to a SMTP smuggling vulnerability.

Vulnerability Insight:
Sendmail 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 . but some other popular e-mail servers do not.

Affected Software/OS:
Sendmail versions through 8.17.2.

Solution:
Update to version 8.18 or later (Release date currently unknown).

CVSS Score:
5.0

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:P/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2023-51765
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://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
https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
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
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