Denial of Service vulnerability in extension Calendar Base (cal)

It has been discovered that the extension "Calendar Base" (cal) is susceptible to Denial of Service.

Release Date: October 17, 2014

Bulletin Update: October 18, 2014 (added CVE)

Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.

Affected Versions: all versions of 0.x.x, 1.0.x, 1.1.x, 1.2.x, 1.3.x, 1.4.x; 1.5.8 and below of 1.5.x; 1.6.0

Vulnerability Type: Denial of Service

Severity: Medium

Suggested CVSS v2.0: AV:N/AC:M/Au:N/C:N/I:N/A:C/E:POC/RL:OF/RC:C

CVE: CVE-2014-8325

Problem Description: User input is passed to PHP's PCRE library without validating it beforehand. Depending on user input this may consume a tremendous amount of system resources.

Solution: Updated versions 1.5.9 (for TYPO3 CMS 4.5.5 - 6.0.99) and 1.6.1 (for TYPO3 CMS 6.1.0 - 6.2.99) are available from the TYPO3 extension manager and at and Users of the extension are advised to update the extension as soon as possible.

Credits: Credits go to Daniel Hahler and Bernd Schuhmacher who discovered and reported the issue.

General advice: Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list to receive future Security Bulletins via E-mail.