-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-15:03.sctp Security Advisory The FreeBSD Project
Topic: SCTP stream reset vulnerability Category: core Module: sctp Announced: 2015-01-27 Credits: Gerasimos Dimitriadis Affects: All supported versions of FreeBSD. Corrected: 2015-01-27 19:36:08 UTC (stable/10, 10.1-STABLE) 2015-01-27 19:37:02 UTC (releng/10.1, 10.1-RELEASE-p5) 2015-01-27 19:37:02 UTC (releng/10.0, 10.0-RELEASE-p17) 2015-01-27 19:36:08 UTC (stable/9, 9.3-STABLE) 2015-01-27 19:37:02 UTC (releng/9.3, 9.3-RELEASE-p9) 2015-01-27 19:36:08 UTC (stable/8, 8.4-STABLE) 2015-01-27 19:37:02 UTC (releng/8.4, 8.4-RELEASE-p23) CVE Name: CVE-2014-8613 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background SCTP protocol provides reliable, flow-controlled, two-way transmission of data. It is a message oriented protocol and can support the SOCK_STREAM and SOCK_SEQPACKET abstractions. II. Problem Description The input validation of received SCTP RE_CONFIG chunks is insufficient, and can result in a NULL pointer deference later. III. Impact A remote attacker who can send a malformed SCTP packet to a FreeBSD system that serves SCTP can cause a kernel panic, resulting in a Denial of Service. IV. Workaround On FreeBSD 10.1 or later systems, the system administrator can set net.inet.sctp.reconfig_enable to 0 to disable processing of RE_CONFIG chunks. This workaround is not available on earlier FreeBSD releases, but systems that do not serve SCTP connections are not vulnerable. 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 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 3) 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 https://security.FreeBSD.org/patches/SA-15:03/sctp.patch # fetch https://security.FreeBSD.org/patches/SA-15:03/sctp.patch.asc # gpg --verify sctp.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:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/8/ r277807 releng/8.4/ r277808 stable/9/ r277807 releng/9.3/ r277808 stable/10/ r277807 releng/10.0/ r277808 releng/10.1/ r277808 - ------------------------------------------------------------------------- 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:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8613> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:03.sctp.asc> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.1 (FreeBSD) iQIcBAEBCgAGBQJUx+qbAAoJEO1n7NZdz2rnR98QAOWIIf7+akuopMxuVnppZKub DKCgVAJznitKoxnBtYMAOTcKdf65dQqaAgznAWBRo+USue5LIOI0jjgLuQgepoG6 eIosPiRXqvMQL6Qqx8ydwM3xiVQd+b9pMiLkh3cfljr1Oh6OV+YSRXC+HBKZXaR6 sn5kHRR7xFiwV/HsX4RoSik3qPbDl1x66jeN5jL0Wqg2qjCagK6OxGOtkIlt3pDj QrYNX/l20hXmvPjRojSEPhY+52X29/nlQjfJg/pwpsmiZJe3cqmfsh1aceUOH1Tu BOVxwE3oYWrJ8NZBa2cKReU1Sdvl1FxtlaXwkE+sRBzh1/vA7AZU6jWL7fEV1wv0 2mZYLoCrSHfBongLMohs4DQ8CCnH3iEoUBRbG9HGwlAh4s9CAre87oIdHHFWRSsg oIHxNDG+lk+yNJuOKfjDT+poyuYw7TlBfYN+ifO5UHPOEIH430FWF3B3P2oH4I/M 7VQRClaxaNiPfAJxa11IwHKWM12yrrM7483AuPqdd1r9OUnx33y1jPY0ByemXv9d LE8jJXs0cdR7zCJuV9R8Uif9xkdGLTj9emsqjaS1KxSJrSzPJaah4nkWq8BRmMXK 3xOxlIM/cGJLU+/cliDy3CqHipU4pt+S4RuAB41xx2k5g9YiAMH178xrfOgrklSH xKfAM/gz4YqESK5QPjqO =859G -----END PGP SIGNATURE-----