WordPress MU wpmu-functions.php cross-site scripting

wordpressmu-wpmufunctions-xss (49184) The risk level is classified as MediumMedium Risk

Description:

WordPress MU is vulnerable to cross-site scripting, caused by improper validation of user-supplied input by the wpmu-functions.php script. A remote attacker could exploit this vulnerability using the HTTP Host header to inject malicious script into a Web page which would be executed in a victim's Web browser within the security context of the hosting Web site, once the page is viewed. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.7
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Upgrade to the latest version of WordPress MU (2.7 or later), available from the WordPress multi-user (MU) Web site. See References.

References:

  • WordPress multi-user (MU) Web site: WordPress MU > Download.
  • BID-34075: WordPress MU 'wp-includes/wpmu-functions.php' Cross-Site Scripting Vulnerability
  • CVE-2009-1030: Cross-site scripting (XSS) vulnerability in the choose_primary_blog function in wp-includes/wpmu-functions.php in WordPress MU (WPMU) before 2.7 allows remote attackers to inject arbitrary web script or HTML via the HTTP Host header.
  • OSVDB ID: 52814: Wordpress MU wp-includes/wpmu-functions.php Host Header XSS
  • SECTRACK ID: 1021838: WordPress MU Input Validation Hole in HTTP Host Header Permits Cross-Site Scripting Attacks

Platforms Affected:

  • WordPress WordPress MU 1.0
  • WordPress WordPress MU 1.0 rc4
  • WordPress WordPress MU 1.0 rc3
  • WordPress WordPress MU 1.0 rc1
  • WordPress WordPress MU 1.0 rc2
  • WordPress WordPress MU 1.1
  • WordPress WordPress MU 1.1.1
  • WordPress WordPress MU 1.2
  • WordPress WordPress MU 1.2.1
  • WordPress WordPress MU 1.2.2
  • WordPress WordPress MU 1.2.3
  • WordPress WordPress MU 1.2.4
  • WordPress WordPress MU 1.2.4 rc1
  • WordPress WordPress MU 1.2.5A
  • WordPress WordPress MU 1.3
  • WordPress WordPress MU 1.3.1
  • WordPress WordPress MU 1.3.2
  • WordPress WordPress MU 1.3.3
  • WordPress WordPress MU 1.5 rc1
  • WordPress WordPress MU 1.5.1
  • WordPress WordPress MU 2.6
  • WordPress WordPress MU 2.6.1
  • WordPress WordPress MU 2.6.2
  • WordPress WordPress MU 2.6.3
  • WordPress WordPress MU 2.6.5
  • WordPress WordPress MU 2.7

Reported:

Mar 10, 2009

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* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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