CVE-2002-0518

Description

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.

5.0

CVSS

Severity: Medium

CVSS 2.0 •

EPSS 1.11% Top 25%

Vendor Advisory freebsd.org Vendor Advisory iss.net Vendor Advisory securityfocus.com

Affected: n/a n/a

References

Link	Tags
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc	vendor advisory
http://www.osvdb.org/6046	vdb entry
http://www.iss.net/security_center/static/8873.php	vdb entry
http://www.iss.net/security_center/static/8875.php	vdb entry patch vendor advisory
http://www.securityfocus.com/bid/4524	vdb entry patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2002-0518?: CVE-2002-0518 has been scored as a medium severity vulnerability.
How to fix CVE-2002-0518?: To fix CVE-2002-0518, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2002-0518 being actively exploited in the wild?: It is possible that CVE-2002-0518 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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