Debian Security Bug TrackerDEBIANCVE:CVE-2023-51764CVE-2023-51764
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
5.1 Medium
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
65.3%
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.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| Debian | 12 | all | postfix | < 3.7.9-0+deb12u1 | postfix_3.7.9-0+deb12u1_all.deb |
| Debian | 11 | all | postfix | < 3.5.23-0+deb11u1 | postfix_3.5.23-0+deb11u1_all.deb |
| Debian | 999 | all | postfix | < 3.8.4-1 | postfix_3.8.4-1_all.deb |
| Debian | 13 | all | postfix | < 3.8.4-1 | postfix_3.8.4-1_all.deb |
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
5.1 Medium
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
65.3%