xine-lib 1.1.12, and other 1.1.15 and earlier versions, relies on an untrusted input value to determine the memory allocation and does not check the result for (1) the MATROSKA_ID_TR_CODECPRIVATE track entry element processed by demux_matroska.c; and (2) PROP_TAG, (3) MDPR_TAG, and (4) CONT_TAG chunks processed by the real_parse_headers function in demux_real.c; which allows remote attackers to cause a denial of service (NULL pointer dereference and crash) or possibly execute arbitrary code via a crafted value.
https://www.redhat.com/archives/fedora-package-announce/2009-January/msg00555.html
https://www.redhat.com/archives/fedora-package-announce/2008-September/msg00385.html
https://www.redhat.com/archives/fedora-package-announce/2008-September/msg00174.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/44653
http://www.securityfocus.com/bid/30797
http://www.securityfocus.com/archive/1/495674/100/0/threaded
http://www.ocert.org/analysis/2008-008/analysis.txt
http://www.mandriva.com/security/advisories?name=MDVSA-2009:020
http://securityreason.com/securityalert/4648
http://secunia.com/advisories/33544
http://secunia.com/advisories/31827
http://lists.opensuse.org/opensuse-security-announce/2009-02/msg00002.html