coresymbolicationd in CoreSymbolication in Apple OS X before 10.10.2 does not verify that expected data types are present in XPC messages, which allows attackers to execute arbitrary code in a privileged context via a crafted app, as demonstrated by lack of verification of xpc_dictionary_get_value API return values during handling of a (1) match_mmap_archives, (2) delete_mmap_archives, (3) write_mmap_archive, or (4) read_mmap_archive command.
http://lists.apple.com/archives/security-announce/2015/Jan/msg00003.html
https://code.google.com/p/google-security-research/issues/detail?id=80
https://exchange.xforce.ibmcloud.com/vulnerabilities/100496