Open-Xchange releases UCS Hotfix 2011-06-23

This Release provides a security update of Univention Corporate Server 2.4 which is integrated at Open-Xchange Advanced Server Edition and Open-Xchange Server Edition for UCS. We encourage administrators to install this update. The Hotfix is available for all customers with a valid Open-Xchange license.

Fixed Components:
  • DHCP3; CVE identification figure: CVE-2011-0927
  • PHP; CVE identification figure: CVE-2011-0421 CVE-2011-0441 CVE-2011-0708 CVE-2011-1466 CVE-2011-1471

Installation of this PTF:

Please note: It is necessary to activate the installation of Hotfixes. Please note the following step at

The system can be updated as usual for UCS using the univention-updater net command or the UMC module Online Update.
  • Please enter your username/password first under the component called „OX" and activate it.
  • In the online-updates module of UMC, under Release information, there is provided the new update
  • Click on "Install this update"
  • Reboot