Veracode Vulnerability DatabaseVERACODE:44838SMTP Smuggling
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.7 Medium
AI Score
Confidence
Low
0.003 Low
EPSS
Percentile
65.3%
Postfix is vulnerable to SMTP smuggling. The vulnerability is caused due to support for . while handling line endings. A remote attacker can exploit this using published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. If Postfix is configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunkingconfiguration options (or certain other options that exist in recent versions), this attack is not possible.
References
www.openwall.com/lists/oss-security/2023/12/24/1
www.openwall.com/lists/oss-security/2023/12/25/1
www.openwall.com/lists/oss-security/2024/05/09/3
access.redhat.com/security/cve/CVE-2023-51764
bugzilla.redhat.com/show_bug.cgi?id=2255563
fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
github.com/duy-31/CVE-2023-51764
github.com/eeenvik1/CVE-2023-51764
lists.debian.org/debian-lts-announce/2024/01/msg00020.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/
lwn.net/Articles/956533/
sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
security-tracker.debian.org/tracker/CVE-2023-51764
www.openwall.com/lists/oss-security/2024/01/22/1
www.postfix.org/announcements/postfix-3.8.5.html
www.postfix.org/smtp-smuggling.html
www.youtube.com/watch?v=V8KPV96g1To
Related
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.7 Medium
AI Score
Confidence
Low
0.003 Low
EPSS
Percentile
65.3%