CVE-2023-51766
Exim SMTP Smuggling Vulnerability
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.
INFO
Published Date :
Dec. 24, 2023, 6:15 a.m.
Last Modified :
Nov. 21, 2024, 8:38 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2023-51766 has a 3 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2023-51766
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-51766.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Exim SMTP Vulnerabilities list
cve exim vulnerabilities
Imoro Umar Farouq's report on Internal Network Penetration Testing
Shell
None
Python Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-51766 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-51766 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2023/12/24/1 Added Reference http://www.openwall.com/lists/oss-security/2023/12/25/1 Added Reference http://www.openwall.com/lists/oss-security/2023/12/29/2 Added Reference http://www.openwall.com/lists/oss-security/2024/01/01/1 Added Reference http://www.openwall.com/lists/oss-security/2024/01/01/2 Added Reference http://www.openwall.com/lists/oss-security/2024/01/01/3 Added Reference https://bugs.exim.org/show_bug.cgi?id=3063 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2255852 Added Reference https://exim.org/static/doc/security/CVE-2023-51766.txt Added Reference https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html Added Reference https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca Added Reference https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 Added Reference https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 Added Reference https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ Added Reference https://lwn.net/Articles/956533/ Added Reference https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Added Reference https://www.openwall.com/lists/oss-security/2023/12/23/2 Added Reference https://www.youtube.com/watch?v=V8KPV96g1To -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Feb. 02, 2024
Action Type Old Value New Value Removed CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Changed Reference Type https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html No Types Assigned https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ No Types Assigned https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ No Types Assigned https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ Mailing List, Third Party Advisory Changed Reference Type https://lwn.net/Articles/956533/ No Types Assigned https://lwn.net/Articles/956533/ Third Party Advisory Changed Reference Type https://www.youtube.com/watch?v=V8KPV96g1To No Types Assigned https://www.youtube.com/watch?v=V8KPV96g1To Exploit Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jan. 18, 2024
Action Type Old Value New Value Added Reference MITRE https://lwn.net/Articles/956533/ [No types assigned] -
CVE Modified by [email protected]
Jan. 12, 2024
Action Type Old Value New Value Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ [No types assigned] -
CVE Modified by [email protected]
Jan. 05, 2024
Action Type Old Value New Value Added Reference MITRE https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html [No types assigned] -
CVE Modified by [email protected]
Jan. 04, 2024
Action Type Old Value New Value Added Reference MITRE https://www.youtube.com/watch?v=V8KPV96g1To [No types assigned] -
Initial Analysis by [email protected]
Jan. 04, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Changed Reference Type http://www.openwall.com/lists/oss-security/2023/12/24/1 No Types Assigned http://www.openwall.com/lists/oss-security/2023/12/24/1 Mailing List, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2023/12/25/1 No Types Assigned http://www.openwall.com/lists/oss-security/2023/12/25/1 Mailing List, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2023/12/29/2 No Types Assigned http://www.openwall.com/lists/oss-security/2023/12/29/2 Mailing List, Mitigation, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2024/01/01/1 No Types Assigned http://www.openwall.com/lists/oss-security/2024/01/01/1 Mailing List, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2024/01/01/2 No Types Assigned http://www.openwall.com/lists/oss-security/2024/01/01/2 Mailing List, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2024/01/01/3 No Types Assigned http://www.openwall.com/lists/oss-security/2024/01/01/3 Mailing List, Third Party Advisory Changed Reference Type https://bugs.exim.org/show_bug.cgi?id=3063 No Types Assigned https://bugs.exim.org/show_bug.cgi?id=3063 Issue Tracking, Vendor Advisory Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=2255852 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=2255852 Issue Tracking, Third Party Advisory Changed Reference Type https://exim.org/static/doc/security/CVE-2023-51766.txt No Types Assigned https://exim.org/static/doc/security/CVE-2023-51766.txt Broken Link Changed Reference Type https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html No Types Assigned https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html Technical Description Changed Reference Type https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca No Types Assigned https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca Patch Changed Reference Type https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 No Types Assigned https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 Patch Changed Reference Type https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 No Types Assigned https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 Mitigation, Vendor Advisory Changed Reference Type https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ No Types Assigned https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Technical Description, Third Party Advisory Changed Reference Type https://www.openwall.com/lists/oss-security/2023/12/23/2 No Types Assigned https://www.openwall.com/lists/oss-security/2023/12/23/2 Issue Tracking, Mailing List, Third Party Advisory Added CWE NIST CWE-345 Added CPE Configuration OR *cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* versions up to (excluding) 4.97.1 Added CPE Configuration OR *cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jan. 02, 2024
Action Type Old Value New Value Added Reference MITRE http://www.openwall.com/lists/oss-security/2024/01/01/3 [No types assigned] -
CVE Modified by [email protected]
Jan. 01, 2024
Action Type Old Value New Value Added Reference MITRE http://www.openwall.com/lists/oss-security/2024/01/01/2 [No types assigned] -
CVE Modified by [email protected]
Jan. 01, 2024
Action Type Old Value New Value Added Reference MITRE http://www.openwall.com/lists/oss-security/2024/01/01/1 [No types assigned] -
CVE Modified by [email protected]
Jan. 01, 2024
Action Type Old Value New Value Changed Description Exim through 4.97 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 Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not. 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. Added Reference MITRE https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 [No types assigned] -
CVE Modified by [email protected]
Dec. 29, 2023
Action Type Old Value New Value Added Reference MITRE http://www.openwall.com/lists/oss-security/2023/12/29/2 [No types assigned] -
CVE Modified by [email protected]
Dec. 26, 2023
Action Type Old Value New Value Added Reference MITRE https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html [No types assigned] -
CVE Modified by [email protected]
Dec. 26, 2023
Action Type Old Value New Value Changed Description Exim through 4.97 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages that appear to originate from the Exim server, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not. Exim through 4.97 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 Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not. Added Reference MITRE http://www.openwall.com/lists/oss-security/2023/12/25/1 [No types assigned] Added Reference MITRE https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca [No types assigned] Added Reference MITRE https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 [No types assigned] Added Reference MITRE https://bugzilla.redhat.com/show_bug.cgi?id=2255852 [No types assigned] -
CVE Modified by [email protected]
Dec. 24, 2023
Action Type Old Value New Value Added Reference MITRE http://www.openwall.com/lists/oss-security/2023/12/24/1 [No types assigned] -
CVE Received by [email protected]
Dec. 24, 2023
Action Type Old Value New Value Added Description Exim through 4.97 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages that appear to originate from the Exim server, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not. Added Reference MITRE https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ [No types assigned] Added Reference MITRE https://exim.org/static/doc/security/CVE-2023-51766.txt [No types assigned] Added Reference MITRE https://bugs.exim.org/show_bug.cgi?id=3063 [No types assigned] Added Reference MITRE https://www.openwall.com/lists/oss-security/2023/12/23/2 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-51766 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-51766
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.71 }} 0.37%
score
0.80185
percentile