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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1911 Resource exhaustion due to sessions stuck in LAST_ACK state 22 July 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: tcp Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-5358 Reference: ESB-2015.1804 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-15:13.tcp.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-15:13.tcp Security Advisory The FreeBSD Project Topic: Resource exhaustion due to sessions stuck in LAST_ACK state Category: core Module: inet Announced: 2015-07-21 Credits: Lawrence Stewart (Netflix, Inc.), Jonathan Looney (Juniper SIRT) Affects: All supported versions of FreeBSD. Corrected: 2015-07-21 23:42:17 UTC (stable/10, 10.2-PRERELEASE) 2015-07-21 23:42:17 UTC (stable/10, 10.2-BETA1-p1) 2015-07-21 23:42:17 UTC (stable/10, 10.2-BETA2-p1) 2015-07-21 23:42:56 UTC (releng/10.1, 10.1-RELEASE-p15) 2015-07-21 23:42:20 UTC (stable/9, 9.3-STABLE) 2015-07-21 23:42:56 UTC (releng/9.3, 9.3-RELEASE-p20) 2015-07-21 23:42:20 UTC (stable/8, 8.4-STABLE) 2015-07-21 23:42:56 UTC (releng/8.4, 8.4-RELEASE-p34) CVE Name: CVE-2015-5358 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 The Transmission Control Protocol (TCP) of the TCP/IP protocol suite provides a connection-oriented, reliable, sequence-preserving data stream service. A socket enters the LAST_ACK state when the local process closes its socket after a FIN has already been received from the remote peer. The socket will remain in the LAST_ACK state until the kernel has transmitted a FIN to the remote peer and the kernel has received an acknowledgement of that FIN from the remote peer, or all retransmits of the FIN have failed and the connection times out. II. Problem Description TCP connections transitioning to the LAST_ACK state can become permanently stuck due to mishandling of protocol state in certain situations, which in turn can lead to accumulated consumption and eventual exhaustion of system resources, such as mbufs and sockets. III. Impact An attacker who can repeatedly establish TCP connections to a victim system (for instance, a Web server) could create many TCP connections that are stuck in LAST_ACK state and cause resource exhaustion, resulting in a denial of service condition. This may also happen in normal operation where no intentional attack is conducted, but an attacker who can send specifically crafted packets can trigger this more reliably. IV. Workaround No workaround is available, but systems that do not provide TCP based service to untrusted networks are not vulnerable. Note that the tcpdrop(8) utility can be used to purge connections which have become wedged. For example, the following command can be used to generate commands that would drop all connections whose last rcvtime is more than 100s: netstat -nxp tcp | \ awk '{ if (int($NF) > 100) print "tcpdrop " $4 " " $5 }' The system administrator can then run the generated script as a temporary measure. Please refer to the tcpdump(8) manual page for additional information. 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. [FreeBSD 10.1] # fetch https://security.FreeBSD.org/patches/SA-15:13/tcp.patch # fetch https://security.FreeBSD.org/patches/SA-15:13/tcp.patch.asc # gpg --verify tcp.patch.asc [FreeBSD 9.x and 8.x] # fetch https://security.FreeBSD.org/patches/SA-15:13/tcp-9.patch # fetch https://security.FreeBSD.org/patches/SA-15:13/tcp-9.patch.asc # gpg --verify tcp-9.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/ r285779 releng/8.4/ r285780 stable/9/ r285779 releng/9.3/ r285780 stable/10/ r285778 releng/10.1/ r285780 - - ------------------------------------------------------------------------- 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-2015-5358> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:13.tcp.asc> - -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.6 (FreeBSD) iQIcBAEBCgAGBQJVrtnrAAoJEO1n7NZdz2rnchoQAMUV9fuXsBvQgvugFVpoe4HP t7tTIzKKmvC3SVOQfPF6jQllVL9qbRJK9zVdFcGX0Iy07/QPKMIRIFXqiYmRwyXt YEuZtZMHEo6w5YS/gEwSndGRFduFAfhaNZndycjA3O5nxR16cvqScDUAv0nErQGD jJzhjbwdrT4fLg06PgLOdNwQKOPhdM1k4ZOdg7WUYDi2iQUmYpD2SOzRAx/SoDK7 N0qd7Cy7mZBLbmm1zbCGDPhvNVYCKQjPjhiZ1GhfzUQ2n9bBOGLf2K1d/N0cttFH /MfJoi2yRlU3iJE2DOJeD0/m4sJLmTL/7sqYEP9W2939oVH0Bku/KoJG4I4rZLDl 6yoKTxtyJGxbw8N2M/ObFpCQwn56Vjf2oo1LhIdBb+T48OwSwxuwrtw4VnlUnVLo oJ5UA1VnazoyU6AwADpHkGPEPvRF1SUXfOuIOoHiZZ6O3eHdoeD3e2HqLQhoYVCj PMEi/k45jPnWWhwV76I65Ig02YRgzhMTSunjXLQhi44Eeavf1SxHTJpSHuVjg3zu MDDW55yB+wJvoetwCg3IkFPfmFBmto679xywDCKVd9VYeKoFsiVE4F/APqf6hN7o qO8etL5oXnwjNsm9Tf8vImoWrBw2gRYkSieG+Vsx4r2r5JNHKRg1AVmRdihI1ATb canMZYhLMD6A1x5T54Ya =UPeI - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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