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TITLE:
FreeBSD TCP Stack Implementation Vulnerabilities

SECUNIA ADVISORY ID:
SA15867

VERIFY ADVISORY:
http://secunia.com/advisories/15867/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
FreeBSD 5.x
http://secunia.com/product/1132/
FreeBSD 4.x
http://secunia.com/product/139/

DESCRIPTION:
FreeBSD has issued an update for the TCP stack. This fixes a
vulnerability, which can be exploited by malicious people to cause a
DoS (Denial of Service) on active TCP sessions.

For more information:
SA15393

Additionally, an error has also been fixed, which causes TCP SYN
packets to be accepted for established connections making it possible
to overwrite certain TCP options.

SOLUTION:
Update FreeBSD or apply patch.

Fixed versions:
2005-06-29 21:38:48 UTC (RELENG_5, 5.4-STABLE)
2005-06-29 21:41:03 UTC (RELENG_5_4, 5.4-RELEASE-p3)
2005-06-29 21:42:33 UTC (RELENG_5_3, 5.3-RELEASE-p17)
2005-06-29 21:43:42 UTC (RELENG_4, 4.11-STABLE)
2005-06-29 21:45:14 UTC (RELENG_4_11, 4.11-RELEASE-p11)
2005-06-29 21:46:15 UTC (RELENG_4_10, 4.10-RELEASE-p16)

Patch for FreeBSD 4.x:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp4.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp4.patch.asc

Patch for FreeBSD 5.x:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:15/tcp.patch.asc

ORIGINAL ADVISORY:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:15.tcp.asc

OTHER REFERENCES:
SA15393:
http://secunia.com/advisories/15393/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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