CVE-2002-0518
First published: Tue Jun 11 2002(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeBSD Kernel | =4.5-stable | |
| FreeBSD Kernel | =4.5-release |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2002-0518?
CVE-2002-0518 has a high severity rating as it can lead to a denial of service by crashing the system.
How do I fix CVE-2002-0518?
To fix CVE-2002-0518, upgrade to a later version of FreeBSD that mitigates this vulnerability, ideally beyond 4.5.
Who is affected by CVE-2002-0518?
CVE-2002-0518 affects users of FreeBSD versions 4.5 and earlier.
What does CVE-2002-0518 exploit?
CVE-2002-0518 exploits the SYN cache and SYN cookie mechanisms in FreeBSD.
Can CVE-2002-0518 be mitigated through configuration changes?
Effective mitigation of CVE-2002-0518 typically requires a software upgrade rather than mere configuration changes.
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