-----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----- _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "[email protected]"