CVE-2020-12063
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.
Does this matter?
Lower severity and a low EPSS score (0.94%). Track it; it rarely justifies an emergency change on its own.
Description
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 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 0.94% probability · 59th percentile
- CISA KEV
- Not listed
- Affected
- postfix/postfix
- Source
- cve@mitre.org
References
- https://www.openwall.com/lists/oss-security/2020/04/23/12Exploit, Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/3Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/12Exploit, Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/3Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.