VDB-16127 · CVE-2000-0916 · BID 1766

FreeBSD 2.0/3.0/4.0/4.1/4.1.1 Initial Sequence Number authentication spoofing

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.04

A vulnerability was found in FreeBSD 2.0/3.0/4.0/4.1/4.1.1 (Operating System). It has been rated as critical. This issue affects some unknown processing of the component Initial Sequence Number Handler. The manipulation with an unknown input leads to a authentication spoofing vulnerability. Using CWE to declare the problem leads to CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

FreeBSD 4.1.1 and earlier, and possibly other BSD-based OSes, uses an insufficient random number generator to generate initial TCP sequence numbers (ISN), which allows remote attackers to spoof TCP connections.

The weakness was disclosed 12/19/2000 by FIRST (Website). It is possible to read the advisory at ftp.freebsd.org. The identification of this vulnerability is CVE-2000-0916. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but an exploit is available.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 10443 (TCP/IP Predictable ISN (Initial Sequence Number) Generation Weakness), which helps to determine the existence of the flaw in a target environment. It is assigned to the family General and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 82005 (Predictable TCP Initial Sequence Numbers Vulnerability).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (10443). The entries 13695, 14800, 16232 and 16233 are pretty similar.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Authentication spoofing
CWE: CWE-290 / CWE-287
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 10443
Nessus Name: TCP/IP Predictable ISN (Initial Sequence Number) Generation Weakness
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802266
OpenVAS Name: TCP/IP Predictable TCP Initial Sequence Number Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/05/2000 🔍
12/19/2000 +75 days 🔍
12/19/2000 +0 days 🔍
03/03/2003 +804 days 🔍
07/01/2014 +4138 days 🔍
05/28/2018 +1427 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: ftp.freebsd.org
Researcher: FIRST
Status: Confirmed

CVE: CVE-2000-0916 (🔍)
SecurityFocus: 1766 - BSD Weak initial Sequence Number Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 07/01/2014 17:26
Updated: 05/28/2018 09:15
Changes: 07/01/2014 17:26 (59), 05/28/2018 09:15 (7)
Complete: 🔍

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