The flag of Kurdufan shows a camel on a dark yellow background. It may be an allusion to the Old Kurdufan, which was an important crossroads of caravan routes mainly by the oasis of El-Obeid. Kurdufan was one of the original provinces of the Sudan. Today it is divided into three provinces: Northern Kurdufan, Western Kurdufan and South Kurdufan. The flag is still used in Northern Kurdufan. The former sultanate probably had no own flag.
"Kordofan" is originally the name of a group of hills, about 200 km in the south of El Obeid. In the here common Koldagi language is the word "Kurdu" to translate with "man".
Source: "Reisen in Nubien, Kordofan, und dem Peträischen Arabien" von Eduard Rüppell, Frankfurt, 1829