CVE-2020-12063 : Security Advisory and Response
Learn about CVE-2020-12063, a Postfix vulnerability allowing email spoofing via homoglyph attacks. Find mitigation steps and long-term security practices here.
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.
Understanding CVE-2020-12063
This CVE involves a vulnerability in the Postfix package that enables attackers to send emails with spoofed sender addresses.
What is CVE-2020-12063?
The vulnerability allows attackers to bypass sender address verification using homoglyphs, posing a risk of email spoofing.
The Impact of CVE-2020-12063
- Attackers can send emails that appear to be from legitimate senders, potentially leading to phishing attacks.
- The vulnerability affects systems using the /etc/postfix/sender_login feature.
Technical Details of CVE-2020-12063
The technical aspects of the CVE.
Vulnerability Description
- Postfix 2.10.1-7 allows sending emails with homoglyphs resembling valid characters.
Affected Systems and Versions
- Postfix 2.10.1-7 package is affected.
Exploitation Mechanism
- Attackers exploit the homoglyph similarity to send spoofed emails undetected.
Mitigation and Prevention
Protecting systems from CVE-2020-12063.
Immediate Steps to Take
- Disable the /etc/postfix/sender_login feature if not essential.
- Implement email authentication mechanisms like SPF, DKIM, and DMARC.
Long-Term Security Practices
- Regularly update Postfix to the latest version.
- Educate users on identifying phishing emails.
Patching and Updates
- Apply patches provided by Postfix to address the vulnerability.