CVE

CVE-2020-12063

Date: (C)2020-04-24   (M)2024-05-17

A certain Postfix 2.10.1-7 package could allow an attacker to send an email from an arbitrary-looking sender via a homoglyph attack, as demonstrated by the similarity of \xce\xbf to the 'o' character. This is potentially relevant when the /etc/postfix/sender_login feature is used, because a spoofed outbound message that uses a configured sender address is blocked with a "Sender address rejected: not logged in" error message, but a spoofed outbound message that uses a homoglyph of a configured sender address is not blocked. NOTE: some third parties argue that any missed blocking of spoofed outbound messages - except for exact matches to a sender address in the /etc/postfix/sender_login file - is outside the design goals of Postfix and thus cannot be considered a Postfix vulnerability

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:		CVSS V2 Severity:
CVSS Score : 5.3		CVSS Score : 5.0
Exploit Score: 3.9		Exploit Score: 10.0
Impact Score: 1.4		Impact Score: 2.9
CVSS V3 Metrics:		CVSS V2 Metrics:
Attack Vector: NETWORK		Access Vector: NETWORK
Attack Complexity: LOW		Access Complexity: LOW
Privileges Required: NONE		Authentication: NONE
User Interaction: NONE		Confidentiality: NONE
Scope: UNCHANGED		Integrity: PARTIAL
Confidentiality: NONE		Availability: NONE
Integrity: LOW
Availability: NONE

Reference:

https://www.openwall.com/lists/oss-security/2020/04/23/12

https://www.openwall.com/lists/oss-security/2020/04/23/3