The setup_group function in bfd/elf.c in libbfd in GNU binutils 2.24 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via crafted section group headers in an ELF file.
http://www.ubuntu.com/usn/USN-2496-1
http://www.openwall.com/lists/oss-security/2014/10/26/2
http://secunia.com/advisories/62746
http://secunia.com/advisories/62241
http://lists.fedoraproject.org/pipermail/package-announce/2014-December/145742.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-December/145328.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-December/145262.html