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vendor:
FreeBSD
by:
SecurityFocus
7.5
CVSS
HIGH
IPv4 and IPv6 packet filtering vulnerability
20
CWE
Product Name: FreeBSD
Affected Version From: FreeBSD 4.5
Affected Version To: FreeBSD 4.6.2
Patch Exists: YES
Related CWE: CVE-2002-0392
CPE: o:freebsd:freebsd
Metasploit: https://www.rapid7.com/db/vulnerabilities/apache-httpd-cve-2002-0392/, https://www.rapid7.com/db/vulnerabilities/http-apache2-chunked-transfer-int-bof/, https://www.rapid7.com/db/vulnerabilities/apache-httpd-1_3_x-apache-chunked-encoding-vulnerability-cve-2002-0392/
Other Scripts: N/A
Tags: N/A
CVSS Metrics: N/A
Nuclei References: N/A
Nuclei Metadata: N/A
Platforms Tested: None
2002

FreeBSD Packet Filtering Vulnerability

The vulnerability exists in situations where a filtering rule permits packets through if they are part of an established connection. It is possible for packets that are not part of an established connection to be allowed through. These packets must have the ECE flag set, which is in the TCP reserved options field. Exploitation of this vulnerability may allow for unauthorized remote access to otherwise protected services.

Mitigation:

Ensure that packet filtering rules are properly configured to prevent packets with the ECE flag set from being allowed through.
Source

Exploit-DB raw data:

source: www.securityfocus.com/bid/2293/info

There exists a serious vulnerability in FreeBSD's implementation of packet filtering for IPv4 and IPv6.

The vulnerability exists in situations where a filtering rule permits packets through if they are part of an established connection.

It is possible for packets that are not part of an established connection to be allowed through. These packets must have the ECE flag set, which is in the TCP reserved options field.

Exploitation of this vulnerability may allow for unauthorized remote access to otherwise protected services. 

https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/20593.tgz

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