CVE-2023-51765
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2023-51765
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-51765.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2023-51765
- Downstream
- Related
- Published
- 2023-12-24T06:15:07Z
- Modified
- 2025-10-16T10:25:54.791903Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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.
- 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/2023/12/26/5
- 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
- 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://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://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
- https://www.youtube.com/watch?v=V8KPV96g1To
- https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc
- https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
- https://lwn.net/Articles/956533/