CVE-2006-4650 Information

Description

Cisco IOS 12.0 12.1 and 12.2 when GRE IP tunneling is used and the RFC2784 compliance fixes are missing does not verify the offset field of a GRE packet during decapsulation which leads to an integer overflow that references data from incorrect memory locations which allows remote attackers to inject crafted packets into the routing queue possibly bypassing intended router ACLs.

Reference

http://secunia.com/advisories/21783 http://securityreason.com/securityalert/1526 http://securitytracker.com/id?1016799 http://www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.html http://www.osvdb.org/28590 http://www.phenoelit.de/stuff/CiscoGRE.txt http://www.securityfocus.com/archive/1/445322/100/0/threaded http://www.securityfocus.com/bid/19878 http://www.vupen.com/english/advisories/2006/3502 https://exchange.xforce.ibmcloud.com/vulnerabilities/28786 https://oval.cisecurity.org/repository/search/definition/oval3Aorg.mitre.oval3Adef3A5713