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CVE-2023-51766 Detail

Description

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2023/12/24/1 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2023/12/25/1 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2023/12/29/2 Mailing List  Mitigation  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2024/01/01/1 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2024/01/01/2 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2024/01/01/3 Mailing List  Third Party Advisory 
https://bugs.exim.org/show_bug.cgi?id=3063 Issue Tracking  Vendor Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2255852 Issue Tracking  Third Party Advisory 
https://exim.org/static/doc/security/CVE-2023-51766.txt Broken Link 
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html Technical Description 
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca Patch 
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 Patch 
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 Mitigation  Vendor Advisory 
https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ Mailing List  Third Party Advisory 
https://lwn.net/Articles/956533/ Third Party Advisory 
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Technical Description  Third Party Advisory 
https://www.openwall.com/lists/oss-security/2023/12/23/2 Issue Tracking  Mailing List  Third Party Advisory 
https://www.youtube.com/watch?v=V8KPV96g1To Exploit 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-345 Insufficient Verification of Data Authenticity cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

16 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-51766
NVD Published Date:
12/24/2023
NVD Last Modified:
02/01/2024
Source:
MITRE