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CVE-2023-51764 Code injection

Significant
Remediate Within one Month

CVE Information

Original CVE data

Published:
Updated:

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.

CWE: CWE-345
CVSS v2-
CVSS v35.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
https://www.postfix.org/smtp-smuggling.html
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
http://www.openwall.com/lists/oss-security/2023/12/24/1
http://www.openwall.com/lists/oss-security/2023/12/25/1
https://bugzilla.redhat.com/show_bug.cgi?id=2255563
https://access.redhat.com/security/cve/CVE-2023-51764
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://github.com/eeenvik1/CVE-2023-51764
https://github.com/duy-31/CVE-2023-51764
https://www.youtube.com/watch?v=V8KPV96g1To
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/
https://lwn.net/Articles/956533/
https://www.openwall.com/lists/oss-security/2024/01/22/1
https://www.postfix.org/announcements/postfix-3.8.5.html
https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html
http://www.openwall.com/lists/oss-security/2024/05/09/3
Affected Vendors

Fedoraproject - (1)

Postfix - (1)

Redhat - (1)

Basic Analysis

Common vulnerability metrics

Vulnerabilty type as detected by PRIOnengine

Code injection

CVSS Scores as calculated by PRIOnengine
CVSS v25
AV:N/AC:L/AU:N/C:N/I:P/A:N
CVSS v37.5
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
MITRE CWE Top 25

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Exploits

Exploits are available either through exploit packs, Github repos or the world wide web in general.

Active Exploitation

Vulnerability is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. See the KEV Catalog

Social Network Activity

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Threat Actor Activity

No sightings of the vulnerability within threat reports.

Cybersecurity Frameworks

How the vulnerability maps against various cybersecurity frameworks

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Compliance Impact

How the submited vulnerability affects compliance

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Web Application Security Frameworks

Applicable if the issue likely affects a web application

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