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Last updated: 4/18/2014

CVE Publication rate: 20.33

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National Cyber Awareness System

Vulnerability Summary for CVE-2004-0230

Original release date: 08/18/2004
Last revised: 08/23/2013
Source: US-CERT/NIST

Overview

TCP, when using a large Window Size, makes it easier for remote attackers to guess sequence numbers and cause a denial of service (connection loss) to persistent TCP connections by repeatedly injecting a TCP RST packet, especially in protocols that use long-lived connections, such as BGP.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 5.0 (MEDIUM) (AV:N/AC:L/AU:N/C:N/I:N/A:P) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (08/16/2006)
The DHS advisory is a good source of background information about the issue: http://www.us-cert.gov/cas/techalerts/TA04-111A.html It is important to note that the issue described is a known function of TCP. In order to perform a connection reset an attacker would need to know the source and destination ip address and ports as well as being able to guess the sequence number within the window. These requirements seriously reduce the ability to trigger a connection reset on normal TCP connections. The DHS advisory explains that BGP routing is a specific case where being able to trigger a reset is easier than expected as the end points can be easily determined and large window sizes are used. BGP routing is also signficantly affected by having it’s connections terminated. The major BGP peers have recently switched to requiring md5 signatures which mitigates against this attack. The following article from Linux Weekly News also puts the flaw into context and shows why it does not pose a significant threat: http://lwn.net/Articles/81560/ Red Hat does not have any plans for action regarding this issue.

References to Advisories, Solutions, and Tools

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US-CERT Vulnerability Note: OVAL
Name: oval:org.mitre.oval:def:3508
Type: Tool Signature
External Source: MS
Name: MS06-064
External Source: MISC
Name: http://www.uniras.gov.uk/vuls/2004/236929/index.htm
External Source: SCO
Name: SCOSA-2005.14
External Source: SGI
Name: 20040403-01-A
External Source: NETBSD
Name: NetBSD-SA2004-006
External Source: OVAL
Name: oval:org.mitre.oval:def:5711
External Source: SCO
Name: SCOSA-2005.3
External Source: SECUNIA
Name: 11440
External Source: HP
Name: HPSBST02161
US-CERT Vulnerability Note: OVAL
Name: oval:org.mitre.oval:def:2689
Type: Tool Signature
External Source: OSVDB
Name: 4030
External Source: VUPEN
Name: ADV-2006-3983
US-CERT Vulnerability Note: CERT-VN
Name: VU#415294
US-CERT Vulnerability Note: OVAL
Name: oval:org.mitre.oval:def:4791
Type: Tool Signature
External Source: CISCO
Name: 20040420 TCP Vulnerabilities in Multiple IOS-Based Cisco Products
US-CERT Vulnerability Note: OVAL
Name: oval:org.mitre.oval:def:270
Type: Tool Signature
External Source: CONFIRM
Name: http://www.juniper.net/support/alert.html
External Source: BUGTRAQ
Name: 20040425 Perl code exploting TCP not checking RST ACK.
External Source: XF
Name: tcp-rst-dos(15886)
Type: Advisory
External Source: SCO
Name: SCOSA-2005.9
External Source: SECUNIA
Name: 11458
External Source: HP
Name: SSRT061264
External Source: SECUNIA
Name: 22341
External Source: BID
Name: 10183
Type: Advisory; Exploit
External Source: MS
Name: MS05-019
External Source: HP
Name: SSRT4696
US-CERT Vulnerability Note: CERT
Name: TA04-111A

References to Check Content

Identifier: oval:org.mitre.oval:def:2689
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5
Identifier: oval:org.mitre.oval:def:270
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5
Identifier: oval:org.mitre.oval:def:3508
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5
Identifier: oval:org.mitre.oval:def:4791
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5
Identifier: oval:org.mitre.oval:def:5711
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

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