Use-after-free vulnerability in the doImageText function in dix/dixfonts.c in the xorg-server module before 1.14.4 in X.Org X11 allows remote authenticated users to cause a denial of service (daemon crash) or possibly execute arbitrary code via a crafted ImageText request that triggers memory-allocation failure.Per: https://bugzilla.redhat.com/show_bug.cgi?id=1014561 ' A malicious, authorized client could use this flaw to crash the X.Org server or, potentially, execute arbitrary code with root privileges.' http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4396
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