-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : openssl SUMMARY : Information leak in encrypted connections DATE : 2003-02-24 19:25:00 ID : CLA-2003:570 RELEVANT RELEASES : 6.0, 7.0, 8 - ------------------------------------------------------------------------- DESCRIPTION OpenSSL[1] implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as full-strength general purpose cryptography functions. It's used (as a library) by several projects, like Apache, OpenSSH, Bind, OpenLDAP and many others clients and servers programs. In an upcoming paper, Brice Canvel (EPFL), Alain Hiltgen (UBS), Serge Vaudenay (EPFL), and Martin Vuagnoux (EPFL, Ilion) describe and demonstrate a timing-based attack on CBC ciphersuites in SSL and TLS. Vulnerable[2][3] openssl versions do not perform a MAC computation if an incorrect block cipher padding is used. An active attacker who can insert data into an existing encrypted connection is then able to measure time differences between the error messages the server sends. This information can make it easier to launch cryptographic attacks that rely on distinguishing between padding and MAC verification errors, possibly leading to extraction of the original plaintext. The openssl packages provided with this update are patched against this vulnerability. SOLUTION It is recommended that all users upgrade their openssl packages. Please note that it is necessary to restart services which use the library (such as the apache web server with SSL enabled) so that the new, fixed, version is used. A list of such applications can be obtained after the upgrade with the following command: lsof | grep libssl The first column will contain the name of the application that needs to be restarted. If there is any doubt about which application has to be restarted or how to do it, we recommend that the system be rebooted. REFERENCES 1. http://www.openssl.org/ 2. http://www.openssl.org/news/secadv_20030219.txt 3. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0078 UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/openssl-0.9.6-4U60_5cl.src.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssl-0.9.6-4U60_5cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssl-devel-0.9.6-4U60_5cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/openssl-0.9.6a-3U70_5cl.src.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-0.9.6a-3U70_5cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-devel-0.9.6a-3U70_5cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-devel-static-0.9.6a-3U70_5cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-doc-0.9.6a-3U70_5cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssl-progs-0.9.6a-3U70_5cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/SRPMS/openssl-0.9.6c-2U80_4cl.src.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-0.9.6c-2U80_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-devel-0.9.6c-2U80_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-devel-static-0.9.6c-2U80_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-doc-0.9.6c-2U80_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/openssl-progs-0.9.6c-2U80_4cl.i386.rpm ADDITIONAL INSTRUCTIONS Users of Conectiva Linux version 6.0 or higher may use apt to perform upgrades of RPM packages: - run: apt-get update - after that, execute: apt-get upgrade Detailed instructions reagarding the use of apt and upgrade examples can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en - ------------------------------------------------------------------------- All packages are signed with Conectiva's GPG key. The key and instructions on how to import it can be found at http://distro.conectiva.com.br/seguranca/chave/?idioma=en Instructions on how to check the signatures of the RPM packages can be found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en - ------------------------------------------------------------------------- All our advisories and generic update instructions can be viewed at http://distro.conectiva.com.br/atualizacoes/?idioma=en - ------------------------------------------------------------------------- subscribe: conectiva-updates-subscribeat_private unsubscribe: conectiva-updates-unsubscribeat_private -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE+WpxB42jd0JmAcZARAlcJAKCTUTnwEV5FWbMiBNzwxP70+8+1pQCfdkB0 dRnnuP71tAjq2ezRKw9hchQ= =VxfP -----END PGP SIGNATURE-----
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