-----BEGIN PGP SIGNED MESSAGE----- NetBSD Security Advisory 2003-005 ================================= Topic: RSA timing attack in OpenSSL code Version: NetBSD-current: source prior to March 19, 2003 NetBSD-1.6: affected (NetBSD-1.6.1 will include the fix) NetBSD-1.5.3: affected NetBSD-1.5.2: affected NetBSD-1.5.1: affected NetBSD-1.5: affected NetBSD-1.4*: not affected pkgsrc: prior to openssl-0.9.6gnb2 Severity: Cryptographic keys can be compromised remotely. Fixed: NetBSD-current: March 19, 2003 NetBSD-1.6 branch: March 21, 2003 (1.6.1 will include the fix) NetBSD-1.5 branch: March 21, 2003 pkgsrc: openssl-0.9.6gnb2 Abstract ======== A timing attack has been discovered, which can be used against OpenSSL. The attack allows remote recovery of private keys, from a host with low-latency access to the server - such as the local host, or a host on the LAN. Research shows that about a million queries are sufficient to extract a 1024-bit RSA key. Any program that uses OpenSSL's RSA logic could be affected. NOTE: Two OpenSSL advisories have appeared within 2 days of each other. while the patches affect libcrypto in this SA, and libssl in 2003-007, please be aware that there are two separate issues with separate sets of patches. Technical Details ================= http://crypto.stanford.edu/~dabo/abstracts/ssl-timing.html Solutions and Workarounds ========================= The following instructions describe how to upgrade your libcrypto binaries by updating your source tree and rebuilding and installing a new version of libcrypto. Be sure to restart running instances of programs that use the libcrypto library after upgrading. If you have any statically-linked binaries that linked against a vulnerable libcrypto, you need to recompile them. * NetBSD-current: Systems running NetBSD-current dated from before 2003-03-19 should be upgraded to NetBSD-current dated 2003-03-19 or later. The following file needs to be updated from the netbsd-current CVS branch (aka HEAD): crypto/dist/openssl/crypto/rsa To update from CVS, re-build, and re-install libcrypto: # cd src # cvs update -d -P crypto/dist/openssl/crypto/rsa # cd lib/libcrypto # make USETOOLS=no cleandir dependall # make USETOOLS=no install * NetBSD 1.6: The binary distribution of NetBSD 1.6 is vulnerable. Systems running NetBSD-1-6 from sources dated before 2002-03-21 should be upgraded to NetBSD-1-6 branch sources dated 2003-03-21 or later. The following files need to be updated from the netbsd-1-6 CVS branch: crypto/dist/openssl/crypto/rsa To update from CVS, re-build, and re-install libcrypto: # cd src # cvs update -d -P -r netbsd-1-6 crypto/dist/openssl/crypto/rsa # cd lib/libcrypto # make USETOOLS=no cleandir dependall # make USETOOLS=no install * NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3: The binary distribution of NetBSD 1.5.3 is vulnerable. Systems running NetBSD-1.5.x dated from before 2003-xx-xx should be upgraded to NetBSD-1.5 branch dated 2003-xx-xx or later. The following file needs to be updated from the netbsd-1-5 CVS branch: crypto/dist/openssl/crypto/rsa To update from CVS, re-build, and re-install libcrypto: # cd src # cvs update -d -P -r netbsd-1-5 \ crypto/dist/openssl/ssl/s3_pkt.c # cd lib/libcrypto # make cleandir dependall # make install * NetBSD 1.4, 1.4.1, 1.4.2, 1.4.3: OpenSSL was not included in the base system in NetBSD-1.4.* Follow the directions for pkgsrc if you have installed it from pkgsrc. * pkgsrc: openssl (pkgsrc/security/openssl) prior to 0.9.6gnb2 are vulnerable. Upgrade to openssl-0.9.6gnb2 or later; pkgsrc currently contains openssl-0.9.6gnb1 at time of this writing. Packages which require openssl can be found by running 'pkg_info openssl'. Depending on the method you choose to update pkgsrc packages, a rebuild of the packages on that list may be performed for you by the package system. If you update using the experimental 'make replace' target, you will need to manually update any packages which build static binaries with libcrypto.a. If you have statically linked binaries in pkgsrc, they have to be rebuilt. Statically linked binaries can be identified by the following command (note: be sure to include the directory you install pkgsrc binaries to, if you've changed LOCALBASE from the default of /usr/pkg) file /usr/pkg/{bin,sbin,libexec}/* | grep static Thanks To ========= Bugtraq and the OpenSSL team. Revision History ================ 2003-03-26 Initial release More Information ================ An up-to-date PGP signed copy of this release will be maintained at ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2003-005.txt.asc Information about NetBSD and NetBSD security can be found at http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/. Copyright 2003, The NetBSD Foundation, Inc. All Rights Reserved. $NetBSD: NetBSD-SA2003-005.txt,v 1.7 2003/03/26 06:14:37 david Exp $ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (NetBSD) Comment: For info see http://www.gnupg.org iQCVAwUBPoHNyD5Ru2/4N2IFAQG6WgP+JRQkdq9QfurZtV5syPwd6SeD6f3k60u0 wSKvPq8mk+dcgwetQ8RnHw+yf3bRNb1YZOT2o5zwyBw13YQ3B/R2iTGX8OKu/Iol 1+OEY4vUX2Ttq76W6RweZGBI8+1tkCuWprvP7i+LFdffKUX0Hv2CiJNnymcRxLLl WHxB7V9b1Hw= =sJ8t -----END PGP SIGNATURE-----
This archive was generated by hypermail 2b30 : Wed Mar 26 2003 - 12:04:56 PST