can you name some of the treatments to cure it?
A procedure called "Transjugular Intrahepatic Portosystemic Shunt".
Hepatorenal syndrome
A transjugular intrahepatic portosystemic shunt (TIPS) involves the decompression of the high pressures in the portal circulation by placing a small stent between a portal and hepatic vein. This is done through radiologically guided catheters which are passed into the hepatic vein either through the internal jugular vein or the femoral vein. 
why does liver failure lead to kidney failure Due to "Hepatorenal Syndrome”, a life-threatening medical condition that causes rapid deterioration in kidney function in individuals with cirrhosis or fulminant liver failure. how is it caused? It usually affects individuals with cirrhosis and elevated pressures in the portal vein system. It is most common in individuals with alcoholic cirrhosis, particularly if there is concomitant alcoholic hepatitis identifiable on liver biopsies. It can also occur in individuals without cirrhosis, but with acute onset of liver failure, termed fulminant liver failure. how is it diagnosed? The major criteria include liver disease with portal hypertension, kidney failure, the absence of shock, etc. The minor criteria are a low urine volume, low sodium concentration in the urine, a urine osmolality that is greater than that in the blood, the absence of red blood cells in the urine, and a serum sodium concentration of less than 130 mmol/L.
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Hepatorenal syndrome [SEP] Procedural treatments
A transjugular intrahepatic portosystemic shunt (TIPS) involves the decompression of the high pressures in the portal circulation by placing a small stent between a portal and hepatic vein. This is done through radiologically guided catheters which are passed into the hepatic vein either through the internal jugular vein or the femoral vein. Theoretically, a decrease in portal pressures is thought to reverse the hemodynamic phenomena that ultimately lead to the development of hepatorenal syndrome. TIPS has been shown to improve kidney function in patients with hepatorenal syndrome. Complications of TIPS for treatment of HRS include the worsening of hepatic encephalopathy (as the procedure involves the forced creation of a porto-systemic shunt, effectively bypassing the ability of the liver to clear toxins), inability to achieve adequate reduction in portal pressure, and bleeding.