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CVE-2023-51765

Published: Dec 24, 2023

Modified: Aug 2, 2024

PUBLISHED

Description

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.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

References

https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/

https://www.openwall.com/lists/oss-security/2023/12/22/7

https://www.openwall.com/lists/oss-security/2023/12/21/7

https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc

[oss-security] 20231224 Re: Re: New SMTP smuggling attack

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[oss-security] 20231225 Re: Re: New SMTP smuggling attack

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https://bugzilla.suse.com/show_bug.cgi?id=1218351

https://bugzilla.redhat.com/show_bug.cgi?id=2255869

https://access.redhat.com/security/cve/CVE-2023-51765

https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html

[oss-security] 20231226 Re: New SMTP smuggling attack

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[oss-security] 20231229 Re: Re: New SMTP smuggling attack

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[oss-security] 20231230 Re: Re: New SMTP smuggling attack

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[oss-security] 20231230 Re: Re: New SMTP smuggling attack

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https://www.youtube.com/watch?v=V8KPV96g1To

https://lwn.net/Articles/956533/

[debian-lts-announce] 20240615 [SECURITY] [DLA 3829-1] sendmail security update

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