Input validation error in WordPress - CVE-2011-4957
Published: June 28, 2012 / Updated: August 11, 2020
Vulnerability identifier: #VU43931
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2011-4957
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: WordPress.ORG
Affected software:
WordPress
WordPress
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
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.
How to mitigate CVE-2011-4957
Install update from vendor's website.
Sources
- http://core.trac.wordpress.org/ticket/16892
- http://secunia.com/advisories/44038
- http://secunia.com/advisories/49138
- http://wordpress.org/news/2011/04/wordpress-3-1-1/
- http://www.debian.org/security/2012/dsa-2470
- http://www.openwall.com/lists/oss-security/2012/04/19/17
- http://www.openwall.com/lists/oss-security/2012/04/19/6