CVE-2020-12063
First published: Fri Apr 24 2020(Updated: )
** DISPUTED ** 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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Postfix Postfix | =2.10.1 | |
| =2.10.1 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-12063?
The severity of CVE-2020-12063 is medium with a CVSS score of 5.3.
How can an attacker exploit CVE-2020-12063?
An attacker can exploit CVE-2020-12063 by sending an email from an arbitrary-looking sender using a homoglyph attack.
Which version of Postfix is affected by CVE-2020-12063?
Postfix version 2.10.1 is affected by CVE-2020-12063.
What is a homoglyph attack?
A homoglyph attack is a type of attack where an attacker uses characters that look similar to legitimate characters to deceive or trick users.
Where can I find more information about CVE-2020-12063?
You can find more information about CVE-2020-12063 at the following references: [Link 1](https://www.openwall.com/lists/oss-security/2020/04/23/12) and [Link 2](https://www.openwall.com/lists/oss-security/2020/04/23/3).
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