How to burn 801MB iso file

I have ubuntu 11.10 (XFce) and I download Xubuntu 13.04 64Bit iso file that have 801MB and both brasero and XFburn can't burn that image on 800MB CD-R. Can I burn that image on that CD using overburn (those programs don't have that option, I use to do that on Windows but never on GNU/Linux) or do I need to buy larger CD?

You probably won't find a CD that will (naturally) support that size file, and overburning isn't recommended due to issues.

I'd recommend using a DVD instead, or if that's not an option, a USB drive.

EDIT: I'd emphasize trying to get a DVD... I personally had many issues with using my 8 GB USB drive. The first time I attempted a DVD install was fully successful.

Besides a DVD, you have several other options.

1. Super Grub2 disk. Burn the beta5 (or probably any later version) to a CD, and then put the ISO on a flash drive or something in a directory called /boot-isos/. Boot SG2D and select detect loop bootable isos. (Note that SG2D only searches drives for loop bootable ISOs that were detected when SG2D was booted, you don't seem to be able to detect a drive afterwards.)
2. Ubuntu ISOs are "hybrid" ISOs, which means you can copy them to a flash drive using dd and directly boot off of that. Also, SG2D above is also a Hybrid ISO
3. UNetbootin and various other tools will copy a ISO file into a flash drive and make it bootable, if you are reluctant to use dd (common nickname is "destroy data" because the syntax is a little weird and mistakes can be tough to recover from.)
4. U3 smart Flashdrives let you load the ISO file after creating a partition. It will then emulate a CD-ROM, even one with more space than 700 MB providing you set it up with enough space. Unfortunately, they stopped selling these back in 2009. This is a fantastic option for ISO files that are problematic to load, "loop boot", or "chainload" via Grub2. I use u3-tool to remove the inital software and replace it with my choice. You can get this via apt-get from the Ubuntu repositories.
5. isostick seems like a more expensive way to get modern hardware that does the same thing as buying a vintage U3 flash drive off of ebay

k3b-2.8.2 allowed me to do a (relatively small and non-configurable) overburn, while xfburn wasn't allowing it (reporting low space)

Of late, I've found dd to be the most reliable way of copying an ISO to a flash drive, and I think that's what you're going to end up doing because they are cheap, common, and large enough. unetbootin has not worked reliably for me the last several times I've used it.

Use

if=filename.iso of=/dev/usbdevice

with filename and usbdevice replaced by the correct values for your system, and you're good to go.

When using dd, always be careful that the input file and the output file are what you want them to be! You can overwrite the contents of your hard drive if you're not careful!!!