The sanitize_widget_instance function in wp-includes/class-wp-customize-widgets.php in WordPress before 4.2.4 does...

Vulnerability Description

The sanitize_widget_instance function in wp-includes/class-wp-customize-widgets.php in WordPress before 4.2.4 does not use a constant-time comparison for widgets, which allows remote attackers to conduct a timing side-channel attack by measuring the delay before inequality is calculated.

References

• https://wordpress.org/news/2015/08/wordpress-4-2-4-security-and-maintenance-release/
• https://core.trac.wordpress.org/changeset/33535
• http://www.securityfocus.com/bid/76160
• http://openwall.com/lists/oss-security/2015/08/04/7
• http://www.securitytracker.com/id/1033178
• http://www.debian.org/security/2015/dsa-3332
• https://wpvulndb.com/vulnerabilities/8130
• https://core.trac.wordpress.org/changeset/33536
• https://codex.wordpress.org/Version_4.2.4