The product group released the December 2013 Cumulative Update for the SharePoint 2013 product family.
Be aware that all Update for SharePoint 2013 require March 2013 PU for SharePoint 2013 to be installed first.
Please also have a look at the article that discusses how to properly patch a SharePoint 2013 farm which has Search enabled.
Previous releases of the SharePoint Server 2013 cumulative update included both the executable and the .CAB file in the same self-extracting executable download. Because of the file size, the SharePoint Server 2013 package has been divided into two separate downloads. One contains the executable file (identified as ubersrv2013kb2850024fullfilex64glb), while the other contains the .CAB file (identified as ubersrv_1). Both are necessary and must be extracted to the same folder to successfully install the update. Both are available by clicking the same Hotfix Download Available link in the KB article for the release.
See the KB article of the SharePoint Server CU for more details.
Read more here.