-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : proftpd SUMMARY : proftpd DoS DATE : 2002-01-09 15:00:00 ID : CLA-2002:450 RELEVANT RELEASES : 5.0, prg graficos, ecommerce, 5.1, 6.0, 7.0 - ------------------------------------------------------------------------- DESCRIPTION ProFTPD is a highly configurable FTP daemon written from scratch for Unix and Unix-like operating systems. This advisory addresses two security problems: 1. ProFTPD was not forward resolving reverse-resolved hostnames. A remote attacker could explore this vulnerability[1] to bypass ProFTPD access control lists or have false information (client hostname) logged. It was discovered by Matthew S. Hallacy <poptixat_private>. 2. A DoS vulnerability[2] was found by Frank Denis. By sending a malicious command to the server, a remote attacker could force the process to consume all CPU and memory resources available to it. Multiple attack instances could effectively bring the server down. This update also fixes a Segmentation Fault problem, found[3] by Mattias <surre1at_private>, which was further analyzed and considered by the developers as not exploitable. SOLUTION As a workaround[4] for the second vulnerability, you can add a DenyFilter for "\*.*/" in the ProFTPD config file, which will catch most of the attack attempts. Although there is an effective workaround for the DoS vulnerability, it's recomended that all proftpd users do the upgrade. Notice that if you are running the ProFTPD server as a standalone process (not using inetd, which is the default configuration), you have to restart the server manually after the upgrade. Also, it's advised to restart the active connections in order to let a new server instance to be loaded. REFERENCES: 1. http://www.securityfocus.com/bid/3310 2. http://www.securityfocus.com/archive/1/169395 3. http://www.securityfocus.com/archive/1/246331 4. http://www.proftpd.org/critbugs.html DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/proftpd-1.2.5rc1-1U50_1cl.src.rpm ftp://atualizacoes.conectiva.com.br/5.0/i386/proftpd-1.2.5rc1-1U50_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/5.0/i386/proftpd-doc-1.2.5rc1-1U50_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/proftpd-1.2.5rc1-1U51_1cl.src.rpm ftp://atualizacoes.conectiva.com.br/5.1/i386/proftpd-1.2.5rc1-1U51_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/5.1/i386/proftpd-doc-1.2.5rc1-1U51_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/proftpd-1.2.5rc1-1U60_1cl.src.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/proftpd-1.2.5rc1-1U60_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/proftpd-doc-1.2.5rc1-1U60_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/proftpd-1.2.5rc1-1U70_1cl.src.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/proftpd-1.2.5rc1-1U70_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/proftpd-doc-1.2.5rc1-1U70_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/proftpd-1.2.5rc1-1U50_1cl.src.rpm ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/proftpd-1.2.5rc1-1U50_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/proftpd-doc-1.2.5rc1-1U50_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/proftpd-1.2.5rc1-1U50_1cl.src.rpm ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/proftpd-1.2.5rc1-1U50_1cl.i386.rpm ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/proftpd-doc-1.2.5rc1-1U50_1cl.i386.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-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 iD8DBQE8PHiw42jd0JmAcZARAkw2AKC6QfIWaQlt0tu1NBqYPSNuw4V+BQCg8wZi y57iTeuipeHnv5h+UaBnID4= =o/C4 -----END PGP SIGNATURE-----
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