CVEvulnerability
CVE-2002-0518
5.0 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2002-08-12
- Last modified
- 2026-06-16
- Assigner
- [email protected]
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
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.
Affected configurations
• freebsd freebsd 4.5
References
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc ftp.freebsd.org
- http://www.iss.net/security_center/static/8873.php www.iss.net
- http://www.iss.net/security_center/static/8875.php Patch, Vendor Advisory
- http://www.osvdb.org/6046 www.osvdb.org
- http://www.securityfocus.com/bid/4524 Patch, Vendor Advisory
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc ftp.freebsd.org
- http://www.iss.net/security_center/static/8873.php www.iss.net
- http://www.iss.net/security_center/static/8875.php Patch, Vendor Advisory
- http://www.osvdb.org/6046 www.osvdb.org
- http://www.securityfocus.com/bid/4524 Patch, Vendor Advisory