Cross-site scripting in PHPMailer - CVE-2017-11503
Published: August 2, 2017
Vulnerability identifier: #VU7653
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2017-11503
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote unauthenticated attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient validation of user-supplied data passed via specially crafted parameter to 'code_generator.phps' example script. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim’s browser in security context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
PHPMailer
Fedora
Ubuntu
libphp-phpmailer (Ubuntu package)
php-PHPMailer
Fedora
Ubuntu
libphp-phpmailer (Ubuntu package)
php-PHPMailer
How to mitigate CVE-2017-11503
Update to version 5.2.24.
libphp-phpmailer (Ubuntu package) - update to Ubuntu Pro
php-PHPMailer - addressed in versions 5.2.24-1.el6, 5.2.24-1.el7, 5.2.24-1.fc24, 5.2.24-1.fc25, 5.2.24-1.fc26
php-PHPMailer - addressed in versions 5.2.24-1.el6, 5.2.24-1.el7, 5.2.24-1.fc24, 5.2.24-1.fc25, 5.2.24-1.fc26