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FreeBSD Security Advisory FreeBSD-SA-06:11.ipsec


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Date: Wed, 22 Mar 2006 16:11:23 GMT
From: FreeBSD Security Advisories <security-advisories@freebsd.org.>
To: Bugtraq <bugtraq@securityfocus.com.>
Subject: FreeBSD Security Advisory FreeBSD-SA-06:11.ipsec
Reply-To: security-advisories@freebsd.org
X-Virus-Scanned: antivirus-gw at tyumen.ru

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FreeBSD-SA-06:11.ipsec Security Advisory The FreeBSD Project Topic: IPsec replay attack vulnerability Category: core Module: sys_netipsec Announced: 2006-03-22 Credits: Pawel Jakub Dawidek Affects: All FreeBSD releases since 4.8-RELEASE Corrected: 2006-03-22 16:01:08 UTC (RELENG_6, 6.1-STABLE) 2006-03-22 16:01:38 UTC (RELENG_6_0, 6.0-RELEASE-p6) 2006-03-22 16:01:56 UTC (RELENG_5, 5.5-STABLE) 2006-03-22 16:02:17 UTC (RELENG_5_4, 5.4-RELEASE-p13) 2006-03-22 16:02:35 UTC (RELENG_5_3, 5.3-RELEASE-p28) 2006-03-22 16:02:49 UTC (RELENG_4, 4.11-STABLE) 2006-03-22 16:03:05 UTC (RELENG_4_11, 4.11-RELEASE-p16) 2006-03-22 16:03:25 UTC (RELENG_4_10, 4.10-RELEASE-p22) CVE Name: CVE-2006-0905 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://www.freebsd.org/security/>;. I. Background IPsec is a set of protocols, including ESP (Encapsulating Security Payload) and AH (Authentication Header), that provide security services for IP datagrams. ESP protects IP payloads from wire-tapping by encrypting them using secret key cryptography algorithms. AH guarantees the integrity of IP packets and protects them from intermediate alteration or impersonation by attaching a cryptographic checksum computed using one-way hash functions. II. Problem Description IPsec provides an anti-replay service which when enabled prevents an attacker from successfully executing a replay attack. This is done through the verification of sequence numbers. A programming error in the fast_ipsec(4) implementation results in the sequence number associated with a Security Association not being updated, allowing packets to unconditionally pass sequence number verification checks. III. Impact An attacker able to to intercept IPSec packets can replay them. If higher level protocols which do not provide any protection against packet replays (e.g., UDP) are used, this may have a variety of effects. IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE, or to the RELENG_6_0, RELENG_5_4, RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 4.10, 4.11, 5.3, 5.4, and 6.0 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:11/ipsec.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:11/ipsec.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. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - ------------------------------------------------------------------------- RELENG_4 src/sys/netipsec/xform_esp.c 1.2.2.4 RELENG_4_11 src/UPDATING 1.73.2.91.2.17 src/sys/conf/newvers.sh 1.44.2.39.2.20 src/sys/netipsec/xform_esp.c 1.2.2.3.6.1 RELENG_4_10 src/UPDATING 1.73.2.90.2.23 src/sys/conf/newvers.sh 1.33.2.34.2.24 src/sys/netipsec/xform_esp.c 1.2.2.3.4.1 RELENG_5 src/sys/netipsec/xform_esp.c 1.9.2.2 RELENG_5_4 src/UPDATING 1.342.2.24.2.22 src/sys/conf/newvers.sh 1.62.2.18.2.18 src/sys/netipsec/xform_esp.c 1.9.2.1.2.1 RELENG_5_3 src/UPDATING 1.342.2.13.2.31 src/sys/conf/newvers.sh 1.62.2.15.2.33 src/sys/netipsec/xform_esp.c 1.9.4.1 RELENG_6 src/sys/netipsec/xform_esp.c 1.10.2.1 RELENG_6_0 src/UPDATING 1.416.2.3.2.11 src/sys/conf/newvers.sh 1.69.2.8.2.7 src/sys/netipsec/xform_esp.c 1.10.4.1 - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0905 The latest revision of this advisory is available at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:11.ipsec.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQFEIXZEFdaIBMps37IRAuqlAJ9ri+xFH1TGs96vNt788uo6plbu1ACcDau4 dm/4Df3zy7GguI+Ekp/hHuQ= =+iZv -----END PGP SIGNATURE-----

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