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Message-ID: <FB24803D1DF2A34FA59FC157B77C970501A749AC@IDSERV04.idef.com> From: idlabs-advisories at idefense.com (idlabs-advisories@...fense.com) Subject: iDEFENSE Security Advisory 03.02.04: FreeBSD Memory Buffer Exhaustion Denial of Service Vulnerability FreeBSD Memory Buffer Exhaustion Denial of Service Vulnerability iDEFENSE Security Advisory 03.02.04 www.idefense.com/application/poi/display?id=78&type=vulnerabilities March 02, 2004 I. BACKGROUND Free BSD is a free, Open Source unix operating system. More information is available at http://www.freebsd.org/. II. DESCRIPTION Remote exploitation of a denial of service (DoS) vulnerability in FreeBSD's memory buffers (mbufs) could allow attackers to launch a DoS attack. By sending many out-of-sequence packets, a low bandwidth denial of service attack is possible against FreeBSD. When the targeted system runs out of memory buffers (mbufs), it is no longer able to accept or create new connections. III. ANALYSIS Exploitation of this vulnerability requires that the targeted system has at least one open TCP port. The DoS will last until the port is closed, either by the attacker or the target machine. iDEFENSE has proof of concept exploit code demonstrating the impact of this vulnerability. IV. DETECTION iDEFENSE has confirmed that this vulnerability exists in FreeBSD 5.1 (default install from media). FreeBSD has stated that all versions are affected. V. WORKAROUND "It may be possible to mitigate some denial-of-service attacks by implementing timeouts at the application level." VI. VENDOR RESPONSE "Do one of the following: 1) Upgrade your vulnerable system to 4-STABLE, or to the RELENG_5_2, RELENG_4_9, or RELENG_4_8 security branch dated after the correction date. OR 2) Patch your present system: The following patch has been verified to apply to FreeBSD 4.x and 5.x systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 5.2] # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/tcp52.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/tcp52.patch.asc [FreeBSD 4.8, 4.9] # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/tcp47.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/tcp47.patch.asc b) Apply the patch. # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the system." VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2004-0171 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE January 22, 2004 Exploit acquired by iDEFENSE February 17, 2004 iDEFENSE clients notified February 18, 2004 Initial vendor notification February 18, 2004 Initial vendor response March 02, 2004 Coordinated public disclosure IX. LEGAL NOTICES Copyright (c) 2004 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@...fense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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