Vulnerability Name:

CVE-2002-0518 (CCN-8875)

Assigned:2002-04-16
Published:2002-04-16
Updated:2008-09-05
Summary:The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.
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:N/I:N/A:L)
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): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-Other
Vulnerability Consequences:Denial of Service
References:Source: CCN
Type: FreeBSD Security Advisory FreeBSD-SA-02:20
syncache/syncookies denial of service

Source: FREEBSD
Type: UNKNOWN
FreeBSD-SA-02:20

Source: MITRE
Type: CNA
CVE-2002-0518

Source: XF
Type: UNKNOWN
bsd-syncookie-pointer-dos(8873)

Source: XF
Type: Patch, Vendor Advisory
bsd-syncache-inpcb-dos(8875)

Source: OSVDB
Type: UNKNOWN
6046

Source: CCN
Type: OSVDB ID: 6046
FreeBSD syncache/syncookie TCP Socket DoS

Source: BID
Type: Patch, Vendor Advisory
4524

Source: CCN
Type: BID-4524
FreeBSD 4.5 syncache / syncookies Denial Of Service Vulnerability

Source: XF
Type: UNKNOWN
bsd-syncache-inpcb-dos(8875)

Vulnerable Configuration:Configuration 1:
  • cpe:/o:freebsd:freebsd:4.5:release:*:*:*:*:*:*
  • OR cpe:/o:freebsd:freebsd:4.5:stable:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/o:freebsd:freebsd:4.5:-:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    BACK
    freebsd freebsd 4.5 release
    freebsd freebsd 4.5 stable
    freebsd freebsd 4.5 -