NVD Vulnerability Detail

CVE-2023-51766

Summary	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.
Publication Date	Dec. 24, 2023, 3:15 p.m.
Registration Date	Dec. 25, 2023, 10 a.m.
Last Update	Nov. 21, 2024, 5:38 p.m.

CVSS3.1 : MEDIUM
スコア	5.3
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
攻撃元区分(AV)	ネットワーク
攻撃条件の複雑さ(AC)	低
攻撃に必要な特権レベル(PR)	不要
利用者の関与(UI)	不要
影響の想定範囲(S)	変更なし
機密性への影響(C)	なし
完全性への影響(I)	低
可用性への影響(A)	なし

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:a:exim:exim::::::::					4.97.1

Configuration2	or higher	or less	more than	less than
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:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:::::::*
cpe:2.3:o:fedoraproject:fedora:38:::::::*
cpe:2.3:o:fedoraproject:fedora:39:::::::*

Configuration3		or higher	or less	more than	less than
cpe:2.3:o:debian:debian_linux:10.0:::::::*

Related information, measures and tools

No	URL	タグ
1	http://www.openwall.com/lists/oss-security/2023/12/24/1	Mailing List Third Party Advisory
2	http://www.openwall.com/lists/oss-security/2023/12/24/1	Mailing List Third Party Advisory
3	http://www.openwall.com/lists/oss-security/2023/12/25/1	Mailing List Third Party Advisory
4	http://www.openwall.com/lists/oss-security/2023/12/25/1	Mailing List Third Party Advisory
5	http://www.openwall.com/lists/oss-security/2023/12/29/2	Mailing List Mitigation Third Party Advisory
6	http://www.openwall.com/lists/oss-security/2023/12/29/2	Mailing List Mitigation Third Party Advisory
7	http://www.openwall.com/lists/oss-security/2024/01/01/1	Mailing List Third Party Advisory
8	http://www.openwall.com/lists/oss-security/2024/01/01/1	Mailing List Third Party Advisory
9	http://www.openwall.com/lists/oss-security/2024/01/01/2	Mailing List Third Party Advisory
10	http://www.openwall.com/lists/oss-security/2024/01/01/2	Mailing List Third Party Advisory
11	http://www.openwall.com/lists/oss-security/2024/01/01/3	Mailing List Third Party Advisory
12	http://www.openwall.com/lists/oss-security/2024/01/01/3	Mailing List Third Party Advisory
13	https://bugs.exim.org/show_bug.cgi?id=3063	Issue Tracking Vendor Advisory
14	https://bugs.exim.org/show_bug.cgi?id=3063	Issue Tracking Vendor Advisory
15	https://bugzilla.redhat.com/show_bug.cgi?id=2255852	Issue Tracking Third Party Advisory
16	https://bugzilla.redhat.com/show_bug.cgi?id=2255852	Issue Tracking Third Party Advisory
17	https://exim.org/static/doc/security/CVE-2023-51766.txt	Broken Link
18	https://exim.org/static/doc/security/CVE-2023-51766.txt	Broken Link
19	https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html	Technical Description
20	https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html	Technical Description
21	https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca	Patch
22	https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca	Patch
23	https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5	Patch
24	https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5	Patch
25	https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766	Mitigation Vendor Advisory
26	https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766	Mitigation Vendor Advisory
27	https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html	Mailing List Third Party Advisory
28	https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html	Mailing List Third Party Advisory
29	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/	Mailing List Third Party Advisory
30	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/	Mailing List Third Party Advisory
31	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/	Mailing List Third Party Advisory
32	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/	Mailing List Third Party Advisory
33	https://lwn.net/Articles/956533/	Third Party Advisory
34	https://lwn.net/Articles/956533/	Third Party Advisory
35	https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/	Technical Description Third Party Advisory
36	https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/	Technical Description Third Party Advisory
37	https://www.openwall.com/lists/oss-security/2023/12/23/2	Issue Tracking Mailing List Third Party Advisory
38	https://www.openwall.com/lists/oss-security/2023/12/23/2	Issue Tracking Mailing List Third Party Advisory
39	https://www.youtube.com/watch?v=V8KPV96g1To	Exploit
40	https://www.youtube.com/watch?v=V8KPV96g1To	Exploit

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-345	データの信頼性についての不十分な検証	https://cwe.mitre.org/data/definitions/345.html

JVN Vulnerability Information

Exim Development の Exim 等複数ベンダの製品におけるデータの信頼性についての不十分な検証に関する脆弱性

Title	Exim Development の Exim 等複数ベンダの製品におけるデータの信頼性についての不十分な検証に関する脆弱性
Summary	Exim Development の Exim 等複数ベンダの製品には、データの信頼性についての不十分な検証に関する脆弱性が存在します。
Possible impacts	情報を改ざんされる可能性があります。
Solution	ベンダアドバイザリまたはパッチ情報が公開されています。参考情報を参照して適切な対策を実施してください。
Publication Date	Dec. 24, 2023, midnight
Registration Date	Jan. 29, 2024, 3:27 p.m.
Last Update	Jan. 29, 2024, 3:27 p.m.

Affected System

Fedora Project

Extra Packages For Enterprise Linux 7.0

Extra Packages For Enterprise Linux 8.0

Extra Packages For Enterprise Linux 9.0

Fedora 38

Fedora 39

Exim Development

Exim 4.97.1 未満

CVE (情報セキュリティ共通脆弱性識別子)

No	Name	URL
Common Vulnerabilities and Exposures (CVE)
1	CVE-2023-51766	https://www.cve.org/CVERecord?id=CVE-2023-51766
National Vulnerability Database (NVD)
2	CVE-2023-51766	https://nvd.nist.gov/vuln/detail/CVE-2023-51766

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-345	https://cwe.mitre.org/data/definitions/345.html

その他

No	Name	URL
JVN
1	JVNVU#94855660	https://jvn.jp/vu/JVNVU94855660/
関連文書
2	bugs.exim.org (3063)	https://bugs.exim.org/show_bug.cgi?id=3063
3	bugzilla.redhat.com (2255852)	https://bugzilla.redhat.com/show_bug.cgi?id=2255852
4	fahrplan.events.ccc.de (11782)	https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
5	git.exim.org (5bb786d5ad568a88d50d15452aacc8404047e5ca)	https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca
6	git.exim.org (cf1376206284f2a4f11e32d931d4aade34c206c5)	https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5
7	github.com (cve-2023-51766)	https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766
8	lists.debian.org (msg00002)	https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html
9	lists.fedoraproject.org (ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB)	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/
10	lists.fedoraproject.org (QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ)	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/
11	lwn.net (Articles/956533)	https://lwn.net/Articles/956533/
12	sec-consult.com (smtp-smuggling-spoofing-e-mails-worldwide)	https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
13	www.openwall.com (oss-security/2023/12/23/2)	https://www.openwall.com/lists/oss-security/2023/12/23/2
14	www.openwall.com (oss-security/2023/12/24/1)	http://www.openwall.com/lists/oss-security/2023/12/24/1
15	www.openwall.com (oss-security/2023/12/25/1)	http://www.openwall.com/lists/oss-security/2023/12/25/1
16	www.openwall.com (oss-security/2023/12/29/2)	http://www.openwall.com/lists/oss-security/2023/12/29/2
17	www.openwall.com (oss-security/2024/01/01/1)	http://www.openwall.com/lists/oss-security/2024/01/01/1
18	www.openwall.com (oss-security/2024/01/01/2)	http://www.openwall.com/lists/oss-security/2024/01/01/2
19	www.openwall.com (oss-security/2024/01/01/3)	http://www.openwall.com/lists/oss-security/2024/01/01/3
20	www.youtube.com (watch?v=V8KPV96g1To)	https://www.youtube.com/watch?v=V8KPV96g1To

Change Log

No	Changed Details	Date of change
1	[2024年01月29日] 掲載	Jan. 29, 2024, 3:27 p.m.