SB2012062801 - Multiple vulnerabilities in WordPress

Description

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2011-4956)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

Vulnerability allows a remote attacker to perform Cross-site scripting attacks.

An input validation error exists in WordPress before 3.1.1. A remote authenticated 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.

2) Input validation error (CVE-ID: CVE-2011-4957)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• 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
• http://www.osvdb.org/72141
• http://core.trac.wordpress.org/ticket/16892