-----BEGIN PGP SIGNED MESSAGE----- NetBSD Security Advisory 2003-007 ================================= Topic: (Another) Encryption weakness in OpenSSL code Version: NetBSD-current: source prior to March 21, 2003 NetBSD-1.6.1: not affected NetBSD-1.6: affected 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: Attacker can perform crypto operations using server's private keys. Fixed: NetBSD-current: March 21, 2003 NetBSD-1.6 branch: March 21, 2003 NetBSD-1.5 branch: March 21, 2003 pkgsrc: openssl-0.9.6gnb2 Abstract ======== Quote from bugtraq posting: Czech cryptologists Vlastimil Klima, Ondrej Pokorny, and Tomas Rosa have come up with an extension of the "Bleichenbacher attack" on RSA with PKCS #1 v1.5 padding as used in SSL 3.0 and TLS 1.0. Their attack requires the attacker to open millions of SSL/TLS connections to the server under attack; the server's behaviour when faced with specially made-up RSA ciphertexts can reveal information that in effect allows the attacker to perform a single RSA private key operation on a ciphertext of its choice using the server's RSA key. Note that the server's RSA key is not compromised in this attack. No services using SSL/TLS are enabled by default in NetBSD, however, by enabling services built with these libraries, a system could become vulnerable to the compromise. NOTE: Two OpenSSL advisories have appeared within 2 days of each other. while the patches affect libssl in this SA, and libcrypto in 2003-005, please be aware that there are two separate issues with separate sets of patches. Technical Details ================= http://marc.theaimsgroup.com/?l=bugtraq&m=104811162730834&w=2 Solutions and Workarounds ========================= The following instructions describe how to upgrade your libssl binaries by updating your source tree and rebuilding and installing a new version of libssl. Be sure to restart running instances of programs that use the libssl library after upgrading. If you have any statically-linked binaries that linked against a vulnerable libssl, you need to recompile them. * NetBSD-current: Systems running NetBSD-current dated from before 2003-02-21 should be upgraded to NetBSD-current dated 2003-02-21 or later. The following file needs to be updated from the netbsd-current CVS branch (aka HEAD): crypto/dist/openssl/ssl/s3_srvr.c To update from CVS, re-build, and re-install libssl: # cd src # cvs update -d -P crypto/dist/openssl/ssl/s3_srvr.c # cd lib/libssl # make USETOOLS=no cleandir dependall # make USETOOLS=no install * NetBSD 1.6: The binary distribution of NetBSD 1.6 is vulnerable. If a source-based point upgrade is required, sources from the NetBSD 1.6 branch dated 2003-03-21 or later should be used. The following file needs to be updated from the netbsd-1-6 CVS branch: crypto/dist/openssl/ssl/s3_srvr.c To update from CVS, re-build, and re-install libssl: # cd src # cvs update -d -P -r netbsd-1-6 \ crypto/dist/openssl/ssl/s3_srvr.c # cd lib/libssl # 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 2003-03-20 should be upgraded to NetBSD-1.5 branch dated 2003-03-21 or later. The following file needs to be updated from the netbsd-1-5 CVS branch: crypto/dist/openssl/ssl/s3_srvr.c To update from CVS, re-build, and re-install libssl: # cd src # cvs update -d -P -r netbsd-1-5 \ crypto/dist/openssl/ssl/s3_srvr.c # cd lib/libssl # 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 openssl-0.9.6gnb2 are vulnerable. Upgrade to openssl-0.9.6gnb2 or later. 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 libssl.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-SA2003-007.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-SA2003-007.txt,v 1.5 2003/03/26 05:51:26 david Exp $ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (NetBSD) Comment: For info see http://www.gnupg.org iQCVAwUBPoHNzz5Ru2/4N2IFAQGumAQAjBgUoa9VLF3R6fm+Q0HASoY3A7+u1msY EgCEz2Kzg+OSgyAED1rHOD1t3EB2LsYpstv9wypVZvHZsB6JHkX/ZjnDwUju55mn r6tY+T4A4d0kGCREQtUkkEcZHy1Rozm7EqP+gOqxjBG7SeStIJK0FM3N/M4B50wi BrruCMHtBA4= =LB2T -----END PGP SIGNATURE-----