Vulnerability Name:

CVE-2000-0916 (CCN-139)

Assigned:1995-01-01
Published:1995-01-01
Updated:2008-09-05
Summary: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.
CVSS v3 Severity:5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
5.5 Medium (Temporal CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
3.7 Low (CCN Temporal CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-Other
Vulnerability Consequences:Bypass Security
References:Source: CCN
Type: FreeBSD Security Advisory FreeBSD-SA-00:52
TCP uses weak initial sequence numbers

Source: FREEBSD
Type: Patch, Vendor Advisory
FreeBSD-SA-00:52

Source: CCN
Type: SGI Security Advisory 20020303-01-A
IRIX TCP/IP Initial Sequence Numbers

Source: CCN
Type: SGI Security Advisory 20020903-01-P
IP denial-of-service fixes and tunings

Source: CCN
Type: BugTraq Mailing List, Wed Jul 25 2001 - 18:17:28 CDT
Weak TCP Sequence Numbers in Sonicwall SOHO Firewall

Source: CCN
Type: BugTraq Mailing List, Thu May 30 2002 - 03:45:09 CDT
2 security problem Quantum SNAP server

Source: CCN
Type: BugTraq Mailing List, Fri May 18 2007 - 08:36:10 CDT
Predictable TCP ISN in Packeteer PacketShaper

Source: MITRE
Type: CNA
CVE-1999-0077

Source: MITRE
Type: CNA
CVE-2000-0328

Source: MITRE
Type: CNA
CVE-2000-0916

Source: MITRE
Type: CNA
CVE-2001-0288

Source: MITRE
Type: CNA
CVE-2001-0328

Source: MITRE
Type: CNA
CVE-2001-0751

Source: MITRE
Type: CNA
CVE-2001-1104

Source: MITRE
Type: CNA
CVE-2007-2782

Source: CCN
Type: Hacker Emergency Response Team Security Advisory #00003
FreeBSD IP Spoofing

Source: CCN
Type: SA25344
Packeteer PacketShaper TCP ISN Generation Weakness

Source: CCN
Type: SA8044
SGI IRIX Multiple Vulnerabilities

Source: CCN
Type: ASA-2007-416
HP-UX running Apache, Remote Arbitrary Code Execution, Cross Site Scripting (XSS) (HPSBUX02262)

Source: CCN
Type: CERT Advisory CA-1995-01
IP Spoofing Attacks and Hijacked Terminal Connections

Source: CCN
Type: CERT Advisory CA-2001-09
Statistical Weaknesses in TCP/IP Initial Sequence Numbers

Source: CCN
Type: CIAC Information Bulletin K-006
Microsoft - Improve TCP Initial Sequence Number Randomness

Source: CCN
Type: CIAC Information Bulletin L-003
FreeBSD TCP Sequence Number Vulnerability

Source: CCN
Type: CIAC Information Bulletin L-053
Cisco IOS Software TCP Initial Sequence Number Improvements

Source: CCN
Type: CIAC Information Bulletin L-086
Cisco Multiple Vulnerabilities in CBOS

Source: CCN
Type: Cisco Systems Field Notice, May 22, 2001
Security Advisory: More Multiple Vulnerabilities in CBOS

Source: CCN
Type: Cisco Systems Field Notice, February 28, 2001
Cisco IOS Software TCP Initial Sequence Number Randomization Improvements

Source: CCN
Type: US-CERT VU#498440
Multiple TCP/IP implementations may use statistically predictable initial sequence numbers

Source: CCN
Type: Microsoft Product Support Services
Windows NT Service Packs

Source: CCN
Type: Microsoft Security Bulletin MS99-046 FAQ
Microsoft Security Bulletin MS99-046: Frequently Asked Questions

Source: CCN
Type: Microsoft Security Bulletin MS01-033
Unchecked Buffer in Index Server ISAPI Extension Could Enable Web Server Compromise

Source: CCN
Type: Microsoft Security Bulletin MS01-041
Malformed RPC Request Can Cause Service Failure

Source: CCN
Type: Microsoft Security Bulletin MS01-044
15 August 2001 Cumulative Patch for IIS

Source: CCN
Type: Microsoft Security Bulletin MS02-001
Trusting Domains Do Not Verify Domain Membership of SIDs in Authorization Data

Source: CCN
Type: Microsoft Security Bulletin MS02-018
Cumulative Patch for Internet Information Services (Q319733)

Source: CCN
Type: Microsoft Security Bulletin MS02-062
Cumulative Patch for Internet Information Service (Q327696)

Source: CCN
Type: Microsoft Security Bulletin MS03-018
Cumulative Patch for Internet Information Service (811114)

Source: CCN
Type: Microsoft Security Bulletin MS99-046
Patch Available to Improve TCP Initial Sequence Number Randomness

Source: CCN
Type: NetScreen Security Alert 51897
Predictable TCP Initial Sequence Numbers

Source: CCN
Type: OSVDB ID: 199
Multiple Vendor TCP/IP ISN Sequence Prediction Weakness

Source: CCN
Type: OSVDB ID: 36226
Packeteer PacketShaper TCP ISN Prediction

Source: CCN
Type: OSVDB ID: 4409
SonicWALL SOHO Firewall Predictable TCP Sequence

Source: CCN
Type: OSVDB ID: 45877
Aztech DSL600EU Router TCP Sequence Prediction Web Interface Access

Source: CCN
Type: Packeteer Web site
PacketShaper

Source: CCN
Type: BID-107
Portmaster Predictable TCP Initial Sequence Number Vulnerability

Source: BID
Type: Patch, Vendor Advisory
1766

Source: CCN
Type: BID-1766
BSD Weak initial Sequence Number Vulnerability

Source: CCN
Type: BID-24048
Packeteer PacketShaper ISN TCP Packet Spoofing Vulnerability

Source: CCN
Type: BID-2682
Multiple Vendor TCP Initial Sequence Number Statistical Vulnerability

Source: CCN
Type: BID-3098
SonicWALL SOHO Firewall Predictable TCP Initial Sequence Number Vulnerability

Source: CCN
Type: BID-4892
Quantum Snap Server Predictable TCP Sequence Number Vulnerability

Source: CCN
Type: BID-604
NT Predictable TCP Sequence Number Vulnerability

Source: CCN
Type: BID-6249
NetScreen ScreenOS Predictable Initial TCP Sequence Number Vulnerability

Source: CCN
Type: BID-670
Linux Predictable TCP Initial Sequence Number Vulnerability

Source: CCN
Type: Proceedings of the Fifth USENIX UNIX Security Symposium, June 1995
Simple Active Attack Against TCP

Source: XF
Type: UNKNOWN
tcp-seq-predict(139)

Source: CCN
Type: Microsoft Knowledge Base Article 192292
Unpredictable TCP Sequence Numbers in SP4

Source: CCN
Type: Microsoft Knowledge Base Article 243835
How to Prevent Predictable TCP/IP Initial Sequence Numbers

Vulnerable Configuration:Configuration 1:
  • cpe:/o:freebsd:freebsd:2.0:*:*:*:*:*:*:*
  • OR cpe:/o:freebsd:freebsd:3.0:*:*:*:*:*:*:*
  • OR cpe:/o:freebsd:freebsd:4.0:*:*:*:*:*:*:*
  • OR cpe:/o:freebsd:freebsd:4.1:*:*:*:*:*:*:*
  • OR cpe:/o:freebsd:freebsd:4.1.1:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:ibm:aix:*:*:*:*:*:*:*:*
  • OR cpe:/o:windriver:bsdos:*:*:*:*:*:*:*:*
  • OR cpe:/o:hp:hp-ux:*:*:*:*:*:*:*:*
  • OR cpe:/o:sgi:irix:*:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • OR cpe:/o:sun:solaris:*:*:*:*:*:*:*:*
  • OR cpe:/o:ibm:os2:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_95:*:*:*:*:*:*:*:*
  • OR cpe:/a:data_general:dg_ux:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_98:*:*:*:*:*:*:*:*
  • OR cpe:/a:novell:netware:*:*:*:*:*:*:*:*
  • OR cpe:/o:sco:unix:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_98se:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_2000:*:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:ios:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_me:*:*:*:*:*:*:*:*
  • OR cpe:/o:compaq:tru64:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows:xp:*:*:*:*:*:*:*
  • OR cpe:/o:apple:mac_os:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows:2003_server:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_vista:*:*:*:*:*:*:*:*
  • OR cpe:/a:packeteer:packetshaper:7.3.0g2:*:*:*:*:*:*:*
  • OR cpe:/a:packeteer:packetshaper:7.5.0g1:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_7:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2008:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2008:r2:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_server_2012:*:*:*:*:*:*:*:*
  • OR cpe:/o:microsoft:windows_8:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    freebsd freebsd 2.0
    freebsd freebsd 3.0
    freebsd freebsd 4.0
    freebsd freebsd 4.1
    freebsd freebsd 4.1.1
    ibm aix *
    windriver bsdos *
    hp hp-ux *
    sgi irix *
    linux linux kernel *
    sun solaris *
    ibm os2 *
    microsoft windows 95 *
    data_general dg ux *
    microsoft windows nt 4.0
    microsoft windows 98 *
    novell netware *
    sco unix *
    microsoft windows 98se *
    microsoft windows 2000 *
    cisco ios *
    microsoft windows me *
    compaq tru64 *
    microsoft windows xp
    apple mac os *
    microsoft windows 2003_server
    microsoft windows vista *
    packeteer packetshaper 7.3.0g2
    packeteer packetshaper 7.5.0g1
    microsoft windows 7 *
    microsoft windows server 2008
    microsoft windows server 2008 - r2
    microsoft windows server 2012
    microsoft windows 8 *