Vulnerability Details : CVE-2023-51765
Potential exploit
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.
Products affected by CVE-2023-51765
- cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:sendmail:sendmail:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-51765
2.91%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 85 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-51765
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
3.9
|
1.4
|
NIST | 2024-01-05 |
CWE ids for CVE-2023-51765
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The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.Assigned by: nvd@nist.gov (Primary)
References for CVE-2023-51765
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http://www.openwall.com/lists/oss-security/2023/12/30/1
oss-security - Re: Re: New SMTP smuggling attackMailing List;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2023/12/26/5
oss-security - Re: New SMTP smuggling attackMailing List;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
[SECURITY] [DLA 3829-1] sendmail security update
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https://access.redhat.com/security/cve/CVE-2023-51765
CVE-2023-51765- Red Hat Customer PortalThird Party Advisory
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http://www.openwall.com/lists/oss-security/2023/12/24/1
oss-security - Re: Re: New SMTP smuggling attackMailing List;Third Party Advisory
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https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
Lecture: SMTP Smuggling – Spoofing E-Mails Worldwide | Wednesday | Schedule 37th Chaos Communication CongressTechnical Description
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https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc
Merge sendmail 8.14.8 to HEAD · freebsd/freebsd-src@5dd76dd · GitHubPatch
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https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
SMTP Smuggling - Spoofing E-Mails Worldwide - SEC ConsultTechnical Description;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2023/12/29/5
oss-security - Re: Re: New SMTP smuggling attackMailing List;Third Party Advisory
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https://www.openwall.com/lists/oss-security/2023/12/21/7
oss-security - Re: New SMTP smuggling attackMailing List;Third Party Advisory
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https://lwn.net/Articles/956533/
Smuggling email inside of email [LWN.net]
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https://www.youtube.com/watch?v=V8KPV96g1To
37C3 - SMTP Smuggling – Spoofing E-Mails Worldwide - YouTubeExploit
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https://bugzilla.redhat.com/show_bug.cgi?id=2255869
2255869 – (CVE-2023-51765) CVE-2023-51765 sendmail: SMTP smuggling vulnerabilityIssue Tracking;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2023/12/25/1
oss-security - Re: Re: New SMTP smuggling attackMailing List;Third Party Advisory
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https://bugzilla.suse.com/show_bug.cgi?id=1218351
1218351 – (CVE-2023-51765) VUL-0: CVE-2023-51765: sendmail: new SMTP smuggling attackIssue Tracking;Patch;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2023/12/30/3
oss-security - Re: Re: New SMTP smuggling attackMailing List;Third Party Advisory
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https://www.openwall.com/lists/oss-security/2023/12/22/7
oss-security - Re: Re: New SMTP smuggling attackMailing List;Third Party Advisory
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