Information disclosure in PHPMailer - CVE-2017-5223

Vulnerability identifier: #VU4756

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-5223

CWE-ID: CWE-200

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to obtain access to potentially sensitive information.

The vulnerability exists in PHPMailer before 5.2.22 when handling HTML documents using msgHTML() method. A remote attacker can create a specially crafted message, containing relative links to images withing message and attach arbitrary local file to e-mail message.

Successful exploitation of this vulnerability may allow an attacker to send out arbitrary system files as email attachments.

PHPMailer
Fedora
Ubuntu
libphp-phpmailer (Ubuntu package)
php-PHPMailer

Update to version 5.2.22.

libphp-phpmailer (Ubuntu package) - update to Ubuntu Pro
php-PHPMailer - addressed in versions 5.2.22-1.el6, 5.2.22-1.el7, 5.2.22-1.fc24

• Exploit #794 - PHPMailer < 5.2.21 - Local File Disclosure (March 18, 2020)

• http://kalilinux.co/2017/01/12/phpmailer-cve-2017-5223-local-information-disclosure-vulnerability-an...
• https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md

• Arbitrary file disclosure in PHPMailer
• Ubuntu update for libphp-phpmailer
• Ubuntu update for libphp-phpmailer
• Fedora EPEL 7 update for php-PHPMailer
• Fedora EPEL 6 update for php-PHPMailer
• Fedora 24 update for php-PHPMailer