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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.0624.2 OpenSSL use-after-free vulnerability 1 May 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: openssl Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Denial of Service -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2010-5298 Reference: ESB-2014.0543 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-14:09.openssl.asc Revision History: May 1 2014: Added patch applying step in Solutions section April 30 2014: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-14:09.openssl Security Advisory The FreeBSD Project Topic: OpenSSL use-after-free vulnerability Category: contrib Module: openssl Announced: 2014-04-30 Affects: FreeBSD 10.x. Corrected: 2014-04-30 04:03:05 UTC (stable/10, 10.0-STABLE) 2014-04-30 04:04:42 UTC (releng/10.0, 10.0-RELEASE-p2) CVE Name: CVE-2010-5298 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/>. 0. Revision History v1.0 2014-04-30 Initial release. v1.1 2014-04-30 Added patch applying step in Solutions section. I. Background FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. OpenSSL context can be set to a mode called SSL_MODE_RELEASE_BUFFERS, which requests the library to release the memory it holds when a read or write buffer is no longer needed for the context. II. Problem Description The buffer may be released before the library have finished using it. It is possible that a different SSL connection in the same process would use the released buffer and write data into it. III. Impact An attacker may be able to inject data to a different connection that they should not be able to. IV. Workaround No workaround is available, but systems that do not use OpenSSL to implement the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols, or not using SSL_MODE_RELEASE_BUFFERS and use the same process to handle multiple SSL connections, are not vulnerable. The FreeBSD base system service daemons and utilities do not use the SSL_MODE_RELEASE_BUFFERS mode. However, many third party software uses this mode to reduce their memory footprint and may therefore be affected by 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-14:09/openssl.patch # fetch http://security.FreeBSD.org/patches/SA-14:09/openssl.patch.asc # gpg --verify openssl.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch Recompile the operating system using buildworld and installworld as described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>. Restart all deamons using the library, or 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/10/ r265122 releng/10.0/ r265124 - - ------------------------------------------------------------------------- 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://ftp.openbsd.org/pub/OpenBSD/patches/5.5/common/004_openssl.patch.sig> <URL:https://rt.openssl.org/Ticket/Display.html?id=2167&user=guest&pass=guest> <URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-5298> The latest revision of this advisory is available at <URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:09.openssl.asc> - -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQIcBAEBCgAGBQJTYUi5AAoJEO1n7NZdz2rnk/8QAMUvAUQzbd0PE8QYH2ZlnHuO fhY8xeIxXzK7/e4WOpXDmC68phxLcGQF4YRtX7Wu/yEchIk7cJPocx6kkht8CpCG t7BpgQOyWY7QRHkIg+hzcooWJFK8nS9miXrwI0vOgWNIbI+iNaSZwNcBsrqF45hI U1/Z6EWFqmEq+VJBtzpp6F7etYYn8OomBF0XFj13Dtr1UnuG+QqOF0c7FH4o0oiL +LpTPlgpubOR1wIx/7nR4j5VeXUwHK3Lrv9X5395YmLVca6pHzeG3pFjGuJJMf8E 9t4Y13EfnetO1AEX7Up86i2h28P8nTqmse+m60LAAwMuHpTRvzruQNvzBguv5Nb7 kVoZKbHb8Ji2rrUEQ//tEYcp57iry0ukvP3uzyvA8q17FeGvx/aJl9Wcc6s+Untd n2WbVvYLnGGNWWI35Yi5eo7TCKcj8z/s0Wgb0omWh7cz7YCjveoG/2x9BHwVGunf VxEmhXPW8HKSEVf/w/yEIAJIechpRv3q9y+Yh5vgMzVqwoP3nXESuQxpzm6Bx/2P 0ZV+IQNAGRXIBQWqjDqC0yZJ/8QNkp+NDRE8ZZHjxnJeQZCayCaEBmjQZcU9qRHP Y2eHu+AiDSi5j2hKyWwY59xlUJ+hBCejzSc0kGiuNq1GWIKltGZ48dnN+H4d4Z6C ZYF6H9F0ykvTxWFfVlFx =H1mN - -----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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBU2GJrhLndAQH1ShLAQJwnhAAl4/T/iB31WUEnDkdtNIgF54syBujDWdD v32qAn6FLjBx5A/chDEiJTG30ecHsZcOTB7LCW2n+EIqbG7ON587+H49OTDo+uR9 v7XKClB5pOCZK23gutXjGKBZlx58rWAaNvRDisvVAzG33p4tAg42uRiOUGNFogax Jfm8ECoFuTcc5Qtx4udD3wYcfw55B1KfaxqzKIL39JFM3SU/npcblTTKnc9/2A5B UQOXsat6OYA+VGMceZZ9PtCur4oMvlfA9Z2oZOWSfktgeBYcuKMxVOdsTMXcaPAD TY6HglIj4xTBilNv9smOcUfKUgnwO9gYOo0BmZ+sf/BHsQMWYf4Aa+yqTxA7UCGu SKff1OF0MI5y8TfIPWdBdAV4e+y1ny2psFr1lFA24+L2ikcclkRCyoETQEFMuJWz 5cLY+xSUAwM3IFExi0litzV5SLY5OwnNhiGPF1ckhPEyH/J2qw38Si9XJwFAL71O H+nz0WDg4TNoAYYYua1k2xIfnHSeJgEw3biWO64Wv/ZqiPKg5pnSnuv4QwaBP51F Gh0TghrheFW7VyFJDhpkw/bTfA1sS26jBTeSFutbtDdm/qV18jc8Hj+l/xb9v9ds aPN29XSkm7UTnto5FzRxDTR63iCVvjhHf40+Rs/wXx563U/VYrqjd+oqS0dovCMF Im6gbTaJuOs= =4aHx -----END PGP SIGNATURE-----