FreeBSD ipfw ICMP IP fragment denial of service

ipfw-icmp-fragment-dos (24073)

Medium Risk

Description:

The ipfw packet filtering utility in FreeBSD is vulnerable to a denial of service attack. A remote attacker could send specially-crafted ICMP IP fragments to an affected system to cause the firewall to crash.

*CVSS:

Base Score:	5
Access Vector:	Remote
Access Complexity:	Low
Authentication:	Not Required
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Complete
Temporal Score:	3.7
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Denial of Service

Remedy:

Refer to FreeBSD Security Advisory FreeBSD-SA-06:04.ipfw for patch or upgrade information. See References.

References:

• FreeBSD Security Advisory FreeBSD-SA-06:04.ipfw : ipfw IP fragment denial of service.
• BID-16209: FreeBSD IPFW IP Fragment Remote Denial Of Service Vulnerability
• CVE-2006-0054: The ipfw firewall in FreeBSD 6.0-RELEASE allows remote attackers to cause a denial of service (firewall crash) via ICMP IP fragments that match a reset, reject or unreach action, which leads to an access of an uninitialized pointer.
• OSVDB ID: 22319: FreeBSD ipfw Layer 4 Tracking Fragmented IP Packet Remote DoS
• SA18378: FreeBSD ipfw IP Fragment Denial of Service Vulnerability
• SECTRACK ID: 1015477: FreeBSD ipfw Error in Processing IP Fragments May Let Remote Users Deny Service

Platforms Affected:

• FreeBSD FreeBSD 6.0

Reported:

Jan 11, 2006

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email xforce@iss.net

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

About IBM Internet Security Systems

IBM Internet Security Systems is a trusted security advisor to thousands of the world's leading businesses and governments, helping to provide pre-emptive protection for networks, desktops and servers. The IBM Proventia? integrated security platform is designed to automatically protect against both known and unknown threats, helping to keep networks up and running and shield customers from online attacks before they impact business assets. IBM Internet Security Systems products and services are based on the proactive security intelligence of its X-Force? research and development team ? an unequivocal world authority in vulnerability and threat research. The IBM Internet Security Systems product line is also complemented by comprehensive Managed Security Services and Professional Security Services. For more information, visit the IBM Internet Security Systems Web site at www.iss.net or call 800-776-2362.