-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : dhcp SUMMARY : Remote Vulnerability DATE : 2003-01-23 16:54:00 ID : CLA-2003:562 RELEVANT RELEASES : 8 - ------------------------------------------------------------------------- DESCRIPTION The package "dhcp" provides a Dynamic Host Configuration Protocol[1] server developed by ISC (ISC DHCPD). During an internal source code audit, the ISC developers found several stack-based buffer overflow vulnerabilities[2,3] in the error handling routines of the minires library. This library is used by the NSUPDATE feature, which is present in dhcp versions newer than 3.0 and allows the DHCP server to dynamically update DNS server records. A remote attacker which can send messages directly to the DHCP server can exploit these vulnerabilities to execute arbitrary code in the server context with the privileges of the root user. The packages provided with this announcement fix these vulnerabilities with a patch from ISC. Please note that Conectiva Linux versions prior to 8 do not ship dhcp 3.0 and therefore are not vulnerable to this problem. SOLUTION All dhcp users should upgrade immediately. After upgrading the packages, please restart the dhcpd service if it is already running. This can be done with the command below (as the root user): # service dhcpd restart REFERENCES: 1.http://www.ietf.org/rfc/rfc2131.txt 2.http://www.cert.org/advisories/CA-2003-01.html 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0026 4.http://www.isc.org/products/DHCP/ UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/8/RPMS/dhcp-3.0-3U80_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/dhcp-doc-3.0-3U80_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/SRPMS/dhcp-3.0-3U80_2cl.src.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+MDqh42jd0JmAcZARAnREAKCn5FLQpS/K2LCN7CKpLp5YicskFwCgqEjb 3vyJFdM/LVHPcYwDHDmhIRk= =k1BM -----END PGP SIGNATURE-----
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