How use the Samsung Galaxy S3 stock contact/phone app with custom ROM?
You need to get a stock ROM of the same Android version. In this case 4.2 JellyBean, since its the base of Cyanogenmod 10.1.

Once you get the stock ROM, you can open it with any zip viewer and get the apps you want from /system/app, then you just connect the phone via USB and adb push the apps to /system/app in the phone. Be sure to wipe cache/dalvik and reboot to apply the changes.

Another easier way is if you have a nandroid of your last stock ROM (and its JB also). You can open the nandroid with WinRAR and get the needed apps from /system/app without searching for the stock ROM.