svn commit: r45614 - in head/share: security/advisories security/patches/SA-14:19 xml
Xin LI <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: delphij
Date: Tue Sep 16 10:03:58 2014
New Revision: 45614
URL: http://svnweb.freebsd.org/changeset/doc/45614
Log:
Add SA-14:19.tcp.
Added:
head/share/security/advisories/FreeBSD-SA-14:19.tcp.asc (contents, props changed)
head/share/security/patches/SA-14:19/
head/share/security/patches/SA-14:19/tcp.patch (contents, props changed)
head/share/security/patches/SA-14:19/tcp.patch.asc (contents, props changed)
Modified:
head/share/xml/advisories.xml
Added: head/share/security/advisories/FreeBSD-SA-14:19.tcp.asc
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/security/advisories/FreeBSD-SA-14:19.tcp.asc Tue Sep 16 10:03:58 2014 (r45614)
@@ -0,0 +1,147 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+=============================================================================
+FreeBSD-SA-14:19.tcp Security Advisory
+ The FreeBSD Project
+
+Topic: Denial of Service in TCP packet processing
+
+Category: core
+Module: inet
+Announced: 2014-09-16
+Credits: Jonathan Looney (Juniper SIRT)
+Affects: All supported versions of FreeBSD.
+Corrected: 2014-09-16 09:48:35UTC (stable/10, 10.1-PRERELEASE)
+ 2014-09-16 09:48:35 UTC (stable/10, 10.1-BETA1-p1)
+ 2014-09-16 09:50:19 UTC (releng/10.0, 10.0-RELEASE-p9)
+ 2014-09-16 09:49:11 UTC (stable/9, 9.3-STABLE)
+ 2014-09-16 09:50:19 UTC (releng/9.3, 9.3-RELEASE-p2)
+ 2014-09-16 09:50:19 UTC (releng/9.2, 9.2-RELEASE-p12)
+ 2014-09-16 09:50:19 UTC (releng/9.1, 9.1-RELEASE-p19)
+ 2014-09-16 09:49:11 UTC (stable/8, 8.4-STABLE)
+ 2014-09-16 09:50:19 UTC (releng/8.4, 8.4-RELEASE-p16)
+CVE Name: CVE-2004-0230
+
+For general information regarding FreeBSD Security Advisories,
+including descriptions of the fields above, security branches, and the
+following sections, please visit <URL:http://security.FreeBSD.org/>.
+
+I. Background
+
+The Transmission Control Protocol (TCP) of the TCP/IP protocol suite
+provides a connection-oriented, reliable, sequence-preserving data
+stream service. New TCP connections are initiated using special SYN
+flag in a datagram. Sequencing of data is controlled by 32-bit sequence
+numbers, that start with a random value and are increased using modulo
+2**32 arithmetic. TCP endpoints maintain a window of expected, and
+thus allowed, sequence numbers for a connection.
+
+II. Problem Description
+
+When a segment with the SYN flag for an already existing connection arrives,
+the TCP stack tears down the connection, bypassing a check that the
+sequence number in the segment is in the expected window.
+
+III. Impact
+
+An attacker who has the ability to spoof IP traffic can tear down a
+TCP connection by sending only 2 packets, if they know both TCP port
+numbers. In case one of the two port numbers is unknown, a successful
+attack requires less than 2**17 packets spoofed, which can be
+generated within less than a second on a decent connection to the
+Internet.
+
+IV. Workaround
+
+It is possible to defend against these attacks with stateful traffic
+inspection using a firewall. This can be done by enabling pf(4) on
+the system and creating states for every connection. Even a default
+ruleset to allow all traffic would be sufficient to mitigate this
+issue.
+
+V. Solution
+
+Perform one of the following:
+
+1) Upgrade your vulnerable system to a supported FreeBSD stable or
+release / security branch (releng) dated after the correction date.
+
+2) To update your vulnerable system via a source code patch:
+
+The following patches have been verified to apply to the applicable
+FreeBSD release branches.
+
+a) Download the relevant patch from the location below, and verify the
+detached PGP signature using your PGP utility.
+
+# fetch http://security.FreeBSD.org/patches/SA-14:19/tcp.patch
+# fetch http://security.FreeBSD.org/patches/SA-14:19/tcp.patch.asc
+# gpg --verify tcp.patch.asc
+
+b) Apply the patch. Execute the following commands as root:
+
+# 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.
+
+3) To update your vulnerable system via a binary patch:
+
+Systems running a RELEASE version of FreeBSD on the i386 or amd64
+platforms can be updated via the freebsd-update(8) utility:
+
+# freebsd-update fetch
+# freebsd-update install
+
+VI. Correction details
+
+The following list contains the correction revision numbers for each
+affected branch.
+
+Branch/path Revision
+- -------------------------------------------------------------------------
+stable/8/ r271668
+releng/8.4/ r271669
+stable/9/ r271668
+releng/9.1/ r271669
+releng/9.2/ r271669
+releng/9.3/ r271669
+stable/10/ r271667
+releng/10.0/ r271669
+- -------------------------------------------------------------------------
+
+To see which files were modified by a particular revision, run the
+following command, replacing NNNNNN with the revision number, on a
+machine with Subversion installed:
+
+# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
+
+Or visit the following URL, replacing NNNNNN with the revision number:
+
+<URL:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
+
+VII. References
+
+<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0230>
+
+The latest revision of this advisory is available at
+<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:19.tcp.asc>
+-----BEGIN PGP SIGNATURE-----
+
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+=qjIZ
+-----END PGP SIGNATURE-----
Added: head/share/security/patches/SA-14:19/tcp.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/security/patches/SA-14:19/tcp.patch Tue Sep 16 10:03:58 2014 (r45614)
@@ -0,0 +1,17 @@
+Index: sys/netinet/tcp_input.c
+===================================================================
+--- sys/netinet/tcp_input.c (revision 271383)
++++ sys/netinet/tcp_input.c (working copy)
+@@ -2092,11 +2092,7 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th,
+
+ todrop = tp->rcv_nxt - th->th_seq;
+ if (todrop > 0) {
+- /*
+- * If this is a duplicate SYN for our current connection,
+- * advance over it and pretend and it's not a SYN.
+- */
+- if (thflags & TH_SYN && th->th_seq == tp->irs) {
++ if (thflags & TH_SYN) {
+ thflags &= ~TH_SYN;
+ th->th_seq++;
+ if (th->th_urp > 1)
Added: head/share/security/patches/SA-14:19/tcp.patch.asc
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/security/patches/SA-14:19/tcp.patch.asc Tue Sep 16 10:03:58 2014 (r45614)
@@ -0,0 +1,16 @@
+-----BEGIN PGP SIGNATURE-----
+
+iQIcBAABCgAGBQJUGAnQAAoJEO1n7NZdz2rnMucQALHIm020vq4E+9LT+OhvMo2o
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+=ZTBf
+-----END PGP SIGNATURE-----
Modified: head/share/xml/advisories.xml
==============================================================================
--- head/share/xml/advisories.xml Tue Sep 16 09:05:41 2014 (r45613)
+++ head/share/xml/advisories.xml Tue Sep 16 10:03:58 2014 (r45614)
@@ -11,6 +11,14 @@
<name>9</name>
<day>
+ <name>16</name>
+
+ <advisory>
+ <name>FreeBSD-SA-14:19.tcp</name>
+ </advisory>
+ </day>
+
+ <day>
<name>9</name>
<advisory>
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