CVE-2002-0518

FreeBSD 4.5 - Denial of Service via SYN Cache and Cookie Mechanism

Title source: llm

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.

References (5)

Core 5

Core References

Patch, Vendor Advisory vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/4524

Various Sources vendor-advisory x_refsource_freebsd

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc

Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb

http://www.osvdb.org/6046

Third Party Advisory vdb-entry x_refsource_xf

http://www.iss.net/security_center/static/8873.php

Patch, Vendor Advisory vdb-entry x_refsource_xf

http://www.iss.net/security_center/static/8875.php

Scores

EPSS 0.0111

EPSS Percentile 78.4%

Details

Status published

Products (1)

freebsd/freebsd 4.5 release (2 CPE variants)

Published Aug 12, 2002

Tracked Since Feb 18, 2026