ID de Prueba:	1.3.6.1.4.1.25623.1.0.53976
Categoría:	FreeBSD Local Security Checks
Título:	FreeBSD Security Advisory (FreeBSD-SA-05:15.tcp.asc)
Resumen:	The remote host is missing an update to the system; as announced in the referenced advisory FreeBSD-SA-05:15.tcp.asc
Descripción:	Summary: The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-05:15.tcp.asc Vulnerability Insight: The Transmission Control Protocol (TCP) of the TCP/IP protocol suite provides a connection-oriented, reliable, sequence-preserving data stream service. TCP timestamps are used to measure Round-Trip Time and in the Protect Against Wrapped Sequences (PAWS) algorithm. TCP packets with the SYN flag set are used during setup of new TCP connections. Two problems have been discovered in the FreeBSD TCP stack. First, when a TCP packets containing a timestamp is received, inadequate checking of sequence numbers is performed, allowing an attacker to artificially increase the internal recent timestamp for a connection. Second, a TCP packet with the SYN flag set is accepted for established connections, allowing an attacker to overwrite certain TCP options. Solution: Upgrade your system to the appropriate stable release or security branch dated after the correction date. CVSS Score: 5.0 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Referencia Cruzada:	Common Vulnerability Exposure (CVE) ID: CVE-2005-0356 BugTraq ID: 13676 http://www.securityfocus.com/bid/13676 CERT/CC vulnerability note: VU#637934 http://www.kb.cert.org/vuls/id/637934 Cisco Security Advisory: 20050518 Vulnerability in a Variant of the TCP Timestamps Option http://www.cisco.com/warp/public/707/cisco-sn-20050518-tcpts.shtml FreeBSD Security Advisory: FreeBSD-SA-05:15 ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:15.tcp.asc SCO Security Bulletin: SCOSA-2005.64 ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.64/SCOSA-2005.64.txt http://secunia.com/advisories/15393 http://secunia.com/advisories/15417/ http://secunia.com/advisories/18222 http://secunia.com/advisories/18662 XForce ISS Database: tcp-ip-timestamp-dos(20635) https://exchange.xforce.ibmcloud.com/vulnerabilities/20635
Copyright	Copyright (C) 2008 E-Soft Inc.

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