medium
5
CWE
20
Advisory Published
Updated

CVE-2011-4957: Input Validation

First published: Wed Jun 27 2012(Updated: )

The make_clickable function in wp-includes/formatting.php in WordPress before 3.1.1 does not properly check URLs before passing them to the PCRE library, which allows remote attackers to cause a denial of service (crash) via a comment with a crafted URL that triggers many recursive calls.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
WordPress<=3.1
WordPress=0.71
WordPress=1.0
WordPress=1.0.1
WordPress=1.0.2
WordPress=1.1.1
WordPress=1.2
WordPress=1.2.1
WordPress=1.2.2
WordPress=1.2.3
WordPress=1.2.4
WordPress=1.2.5
WordPress=1.2.5-a
WordPress=1.3
WordPress=1.3.2
WordPress=1.3.3
WordPress=1.5
WordPress=1.5.1
WordPress=1.5.1.1
WordPress=1.5.1.2
WordPress=1.5.1.3
WordPress=1.5.2
WordPress=2.0
WordPress=2.0.1
WordPress=2.0.2
WordPress=2.0.4
WordPress=2.0.5
WordPress=2.0.6
WordPress=2.0.7
WordPress=2.0.8
WordPress=2.0.9
WordPress=2.0.10
WordPress=2.0.11
WordPress=2.1
WordPress=2.1.1
WordPress=2.1.2
WordPress=2.1.3
WordPress=2.2
WordPress=2.2.1
WordPress=2.2.2
WordPress=2.2.3
WordPress=2.3
WordPress=2.3.1
WordPress=2.3.2
WordPress=2.3.3
WordPress=2.5
WordPress=2.5.1
WordPress=2.6
WordPress=2.6.1
WordPress=2.6.2
WordPress=2.6.3
WordPress=2.6.5
WordPress=2.7
WordPress=2.7.1
WordPress=2.8
WordPress=2.8.1
WordPress=2.8.2
WordPress=2.8.3
WordPress=2.8.4
WordPress=2.8.4-a
WordPress=2.8.5
WordPress=2.8.5.1
WordPress=2.8.5.2
WordPress=2.8.6
WordPress=2.9
WordPress=2.9.1
WordPress=2.9.1.1
WordPress=2.9.2
WordPress=3.0
WordPress=3.0.1
WordPress=3.0.2
WordPress=3.0.3
WordPress=3.0.4
WordPress=3.0.5
WordPress=3.0.6

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2011-4957?

    CVE-2011-4957 is classified as a high severity vulnerability that can lead to denial of service on affected WordPress versions.

  • How do I fix CVE-2011-4957?

    To fix CVE-2011-4957, upgrade your WordPress installation to version 3.1.1 or later.

  • Which versions of WordPress are affected by CVE-2011-4957?

    CVE-2011-4957 affects all WordPress versions prior to 3.1.1.

  • What kind of attack can exploit CVE-2011-4957?

    An attacker can exploit CVE-2011-4957 by submitting a specially crafted URL in comments, causing a denial of service.

  • Is there a workaround for CVE-2011-4957 if I cannot upgrade?

    There are no recommended workarounds for CVE-2011-4957 other than upgrading to a patched version of WordPress.

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