Release Date: September 27, 2011
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: Version 1.1.1 and all versions below
Vulnerability Type: Cross-Site Scripting
Severity: Medium
Suggested CVSS v2.0: AV:N/AC:L/Au:N/C:P/I:P/A:N/E:F/RL:OF/RC:C (What is this?)
Problem Description: T3Blog comments widget fails to escape the title of the parent comment when posting comments to comments. Thus Cross-Site Scripting becomes possible. Exploitation is possible by passing a specially crafted string as a URL parameter.
Solution: An updated version 1.1.2 is available from the TYPO3 extension manager and athttp://typo3.org/extensions/repository/view/t3blog/1.1.2/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Georg Ringer who discovered and reported the issue.
General advice: Follow the recommendations that are given in the TYPO3 Security Cookbook. Please subscribe to thetypo3-announce mailing list to receive future Security Bulletins via E-mail.
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