IBM DB2 Universal Database (UDB) before 8.1 FixPak 13 allows remote authenticated users to cause a denial of service (crash) by (1) sending the first ACCSEC command without an RDBNAM parameter during the CONNECT process, or (2) sending crafted SQLJRA packet, which results in a null dereference.
ftp://ftp.software.ibm.com/ps/products/db2/fixes/english-us/aparlist/db2_v82/APARLIST.TXT
secunia.com/advisories/21550
www-1.ibm.com/support/docview.wss?uid=swg24013114
www.appsecinc.com/resources/alerts/db2/2006-09-05.shtml
www.securityfocus.com/archive/1/445298/100/0/threaded
www.securityfocus.com/archive/1/454307/100/0/threaded
www.securityfocus.com/bid/19586
www.vupen.com/english/advisories/2006/3328