{"vuid":"VU#658884","idnumber":"658884","name":"Cisco IPS fails to properly check fragmented IP packets","keywords":["Cisco","Intrusion Prevention System","evasion","fragmented IP packets"],"overview":"Cisco IPS systems may fail to check specially crafted IP packets that are fragmented.","clean_desc":"Some Cisco intrusion prevention system (IPS) products can be configured as passive intrusion detection systems (IDS) or active IPS systems. Cisco refers to the IPS mode as \"inline\" and the IDS mode as \"promiscuous\". An attacker may be able to create a stream of specially crafted fragmented IP packets that are not processed by the IPS. This would allow an attacker to generate malicious traffic that evades IPS inspection.","impact":"IPS products in inline mode may allow malicious traffic to pass through them. IPS products in promiscuous mode may not detect malicious traffic.","resolution":"Upgrade\nCisco has released an update that addresses this issue. See Cisco Security Advisory cisco-sa-20060920-ips for more details.","workarounds":"","sysaffected":"","thanks":"Cisco credits \nPratap Ramamurthy and Shai Rubin \nfor reporting this vulnerability.","author":"This document was written by Ryan Giobbi.","public":["http://www.cisco.com/warp/public/707/cisco-sa-20060920-ips.shtml","http://www.cisco.com/en/US/products/hw/vpndevc/ps4077/products_qanda_item0900aecd801e6a99.shtml"],"cveids":["CVE-2006-4911"],"certadvisory":"","uscerttechnicalalert":null,"datecreated":"2006-09-20T17:14:48Z","publicdate":"2006-09-20T00:00:00Z","datefirstpublished":"2006-09-20T19:06:07Z","dateupdated":"2006-09-20T19:11:55Z","revision":20,"vrda_d1_directreport":"0","vrda_d1_population":"2","vrda_d1_impact":"3","cam_widelyknown":"10","cam_exploitation":"0","cam_internetinfrastructure":"7","cam_population":"3","cam_impact":"15","cam_easeofexploitation":"16","cam_attackeraccessrequired":"20","cam_scorecurrent":"4.59","cam_scorecurrentwidelyknown":"7.29","cam_scorecurrentwidelyknownexploited":"12.69","ipprotocol":"","cvss_accessvector":"","cvss_accesscomplexity":"","cvss_authentication":null,"cvss_confidentialityimpact":"","cvss_integrityimpact":"","cvss_availabilityimpact":"","cvss_exploitablity":null,"cvss_remediationlevel":"","cvss_reportconfidence":"","cvss_collateraldamagepotential":"","cvss_targetdistribution":"","cvss_securityrequirementscr":"","cvss_securityrequirementsir":"","cvss_securityrequirementsar":"","cvss_basescore":"","cvss_basevector":"","cvss_temporalscore":"","cvss_environmentalscore":"","cvss_environmentalvector":"","metric":4.59,"vulnote":null}