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CVE-2023-51764

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6591-2
Posted Jan 31, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6591-2 - USN-6591-1 fixed vulnerabilities in Postfix. A fix with less risk of regression has been made available since the last update. This update updates the fix and aligns with the latest configuration guidelines regarding this vulnerability.

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2023-51764
SHA-256 | 4babe964a075f29aecde00f0223d7790a3f252d1959a3b8d3883b4b8fdb53043
Download | Favorite | View
Ubuntu Security Notice USN-6591-1
Posted Jan 22, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6591-1 - Timo Longin discovered that Postfix incorrectly handled certain email line endings. A remote attacker could possibly use this issue to bypass an email authentication mechanism, allowing domain spoofing and potential spamming. Please note that certain configuration changes are required to address this issue. They are not enabled by default for backward compatibility.

tags | advisory, remote, spoof
systems | linux, ubuntu
advisories | CVE-2023-51764
SHA-256 | cd5cc57d32efc49d552e07491f59c17b34bb117d5119591cdbe4d6acf87220b6
Download | Favorite | View
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