NVD Vulnerability Detail

CVE-2023-51764

Summary	Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). 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 Postfix supports <LF>.<CR><LF> but some other popular e-mail servers do not. To prevent attack variants (by always disallowing <LF> without <CR>), a different solution is required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.
Publication Date	Dec. 24, 2023, 2:15 p.m.
Registration Date	Dec. 24, 2023, 4 p.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:postfix:postfix::::::::	3.8.0			3.8.4
cpe:2.3:a:postfix:postfix::::::::	3.7.0			3.7.9
cpe:2.3:a:postfix:postfix::::::::	3.6.0			3.6.13
cpe:2.3:a:postfix:postfix::::::::				3.5.23

Configuration2	or higher	or less	more than	less than
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:redhat:enterprise_linux:8.0:::::::*
cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*

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/2024/05/09/3
6	http://www.openwall.com/lists/oss-security/2024/05/09/3
7	https://access.redhat.com/security/cve/CVE-2023-51764	Third Party Advisory
8	https://access.redhat.com/security/cve/CVE-2023-51764	Third Party Advisory
9	https://bugzilla.redhat.com/show_bug.cgi?id=2255563	Issue Tracking Third Party Advisory
10	https://bugzilla.redhat.com/show_bug.cgi?id=2255563	Issue Tracking Third Party Advisory
11	https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html	Technical Description
12	https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html	Technical Description
13	https://github.com/duy-31/CVE-2023-51764	Exploit Third Party Advisory
14	https://github.com/duy-31/CVE-2023-51764	Exploit Third Party Advisory
15	https://github.com/eeenvik1/CVE-2023-51764	Exploit Third Party Advisory
16	https://github.com/eeenvik1/CVE-2023-51764	Exploit Third Party Advisory
17	https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html
18	https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html
19	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/
20	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/
21	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/
22	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/
23	https://lwn.net/Articles/956533/
24	https://lwn.net/Articles/956533/
25	https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/	Technical Description Third Party Advisory
26	https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/	Technical Description Third Party Advisory
27	https://www.openwall.com/lists/oss-security/2024/01/22/1
28	https://www.openwall.com/lists/oss-security/2024/01/22/1
29	https://www.postfix.org/announcements/postfix-3.8.5.html
30	https://www.postfix.org/announcements/postfix-3.8.5.html
31	https://www.postfix.org/smtp-smuggling.html	Exploit Mitigation Vendor Advisory
32	https://www.postfix.org/smtp-smuggling.html	Exploit Mitigation Vendor Advisory
33	https://www.youtube.com/watch?v=V8KPV96g1To	Exploit
34	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

Postfix Project の postfix 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	Postfix Project の postfix 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	Postfix Project の postfix 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	Feb. 1, 2024, 2:34 p.m.
Last Update	Feb. 1, 2024, 2:34 p.m.

Affected System

レッドハット

Red Hat Enterprise Linux 8.0

Red Hat Enterprise Linux 9.0

Postfix Project

postfix 3.5.23 未満

postfix 3.6.0 以上 3.6.13 未満

postfix 3.7.0 以上 3.7.9 未満

postfix 3.8.0 以上 3.8.4 未満

Fedora Project

Fedora 38

Fedora 39

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-2023-51764	https://www.cve.org/CVERecord?id=CVE-2023-51764
National Vulnerability Database (NVD)
2	CVE-2023-51764	https://nvd.nist.gov/vuln/detail/CVE-2023-51764

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	access.redhat.com (CVE-2023-51764)	https://access.redhat.com/security/cve/CVE-2023-51764
3	bugzilla.redhat.com (2255563)	https://bugzilla.redhat.com/show_bug.cgi?id=2255563
4	fahrplan.events.ccc.de (11782)	https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
5	github.com (CVE-2023-51764)	https://github.com/duy-31/CVE-2023-51764
6	github.com (CVE-2023-51764)	https://github.com/eeenvik1/CVE-2023-51764
7	lists.fedoraproject.org (JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO)	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/
8	lists.fedoraproject.org (QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC)	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/
9	sec-consult.com (smtp-smuggling-spoofing-e-mails-worldwide)	https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
10	www.openwall.com (oss-security/2023/12/24/1)	http://www.openwall.com/lists/oss-security/2023/12/24/1
11	www.openwall.com (oss-security/2023/12/25/1)	http://www.openwall.com/lists/oss-security/2023/12/25/1
12	www.postfix.org (smtp-smuggling)	https://www.postfix.org/smtp-smuggling.html
13	www.youtube.com (watch?v=V8KPV96g1To)	https://www.youtube.com/watch?v=V8KPV96g1To

Change Log

No	Changed Details	Date of change
1	[2024年02月01日] 掲載	Feb. 1, 2024, 2:34 p.m.