81439 2002-10-17 00:29 /101 rader/ <secure@conectiva.com.br> Importerad: 2002-10-17 00:29 av Brevbäraren Extern mottagare: conectiva-updates@papaleguas.conectiva.com.br Extern mottagare: lwn@lwn.net Extern mottagare: bugtraq@securityfocus.com Extern mottagare: security-alerts@linuxsecurity.com Mottagare: Bugtraq (import) <1969> Ärende: [CLA-2002:531] Conectiva Linux Security Announcement - fetchmail ------------------------------------------------------------ -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : fetchmail SUMMARY : Multidrop mode vulnerabilities DATE : 2002-10-16 13:05:00 ID : CLA-2002:531 RELEVANT RELEASES : 6.0, 7.0, 8 - ------------------------------------------------------------------------- DESCRIPTION Fetchmail is a popular mail retrieval and forwarding utility. Stefan Esser discovered[1] two vulnerabilities in fetchmail functions responsible for parsing message headers. These vulnerabilities are present in unpatched versions of fetchmail prior to 6.1.0 and can be exploited only if it is running in "multidrop" mode. The first one is a broken boundary check, which can be exploited by a remote attacker who is able to send a specially crafted DNS packet to the victim. This attack can crash fetchmail, thus causing a Denial of Service (DoS). The second one is a buffer overflow. A remote attacker can exploit it by sending a message with a specially crafted 'Received:' header inside it. By exploiting this the attacker can execute arbitrary code with the privileges of the user running fetchmail. SOLUTION All fetchmail users should upgrade. IMPORTANT: if fetchmail is running as a daemon, it will have to be restarted in order to run the new version. REFERENCES: 1.http://security.e-matters.de/advisories/032002.html DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmail-5.9.12-1U60_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmailconf-5.9.12-1U60_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmail-doc-5.9.12-1U60_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/fetchmail-5.9.12-1U60_3cl.src.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmail-5.9.12-1U70_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmailconf-5.9.12-1U70_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmail-doc-5.9.12-1U70_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/fetchmail-5.9.12-1U70_3cl.src.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/fetchmail-5.9.12-1U80_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/fetchmailconf-5.9.12-1U80_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/fetchmail-doc-5.9.12-1U80_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/SRPMS/fetchmail-5.9.12-1U80_2cl.src.rpm ADDITIONAL INSTRUCTIONS Users of Conectiva Linux version 6.0 or higher may use apt to perform upgrades of RPM packages: - add the following line to /etc/apt/sources.list if it is not there yet (you may also use linuxconf to do this): rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates (replace 6.0 with the correct version number if you are not running CL6.0) - 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-subscribe@papaleguas.conectiva.com.br unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9rYBU42jd0JmAcZARAgfrAJ92iPXP2azx+np0zZNKjGgMnOy1XwCfTmy2 UW3BcaWlPVdObb1Wsyswg/Y= =pyoh -----END PGP SIGNATURE----- (81439) / <secure@conectiva.com.br>/------(Ombruten)