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TYPO3-EXT-SA-2011-013: Cross-Site scripting vulnerability in extension t3blog (t3blog)

It has been discovered that the extension "T3Blog" (t3blog) is vulnerable to Cross-Site Scripting.

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.