Integer underflow in the DecodeGRE function in src/decode.c in Snort 2.6.1.2 allows remote attackers to trigger dereferencing of certain memory locations via crafted GRE packets, which may cause corruption of log files or writing of sensitive information into log files.
labs.calyptix.com/advisories/CX-2007-01.txt
osvdb.org/32095
osvdb.org/33464
securityreason.com/securityalert/2165
securitytracker.com/id?1017507
www.securityfocus.com/archive/1/456598/100/0/threaded
www.securityfocus.com/bid/22004
www.snort.org/got_source/source.html
www.vupen.com/english/advisories/2007/0152