Infinite loops in ImageMagick's XCF and DCM coders

ImageMagick before 6.3.5-9 allows context-dependent attackers to cause a denial of service via a crafted image file that triggers 1 an infinite loop in the ReadDCMImage function, related to ReadBlobByte function calls; or 2 an infinite loop in the ReadXCFImage function, related to ReadBlobMSBLong...