DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs794560

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
wordpress (PTS)jessie (security), jessie4.1+dfsg-1+deb8u17fixed
stretch (security), stretch4.7.5+dfsg-2+deb9u3fixed
buster, sid4.9.7+dfsg1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
wordpresssourcesqueeze(not affected)
wordpresssourcewheezy(not affected)


[squeeze] - wordpress <not-affected> (Vulnerable code introduced later)
[wheezy] - wordpress <not-affected> (Vulnerable code introduced later)

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