CVEvulnerability
CVE-2020-12063
5.3 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2020-04-24
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:P/A:N
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
Affected configurations
• postfix postfix 2.10.1
References
- https://www.openwall.com/lists/oss-security/2020/04/23/12 Exploit, Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/3 Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/12 Exploit, Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/3 Mailing List, Third Party Advisory