Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Postfix | Postfix | 2.10.1 |
References
- https://www.openwall.com/lists/oss-security/2020/04/23/12ExploitMailing ListThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/3Mailing ListThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/12ExploitMailing ListThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/04/23/3Mailing ListThird Party Advisory
FAQ
What is CVE-2020-12063?
CVE-2020-12063 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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....
How severe is CVE-2020-12063?
CVE-2020-12063 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-12063?
Check the references section above for vendor advisories and patch information. Affected products include: Postfix Postfix.