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Date: Thu, 9 Sep 2004 20:54:06 -0300 From: Conectiva Updates <secure@...ectiva.com.br> To: conectiva-updates@...aleguas.conectiva.com.br, lwn@....net, bugtraq@...urityfocus.com, security-alerts@...uxsecurity.com, linsec@...ts.seifried.org Subject: [CLA-2004:860] Conectiva Security Announcement - krb5 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : krb5 SUMMARY : Multiple vulnerabilities in Kerberos 5 DATE : 2004-09-09 20:53:00 ID : CLA-2004:860 RELEVANT RELEASES : 9, 10 - ------------------------------------------------------------------------- DESCRIPTION The "krb5" packages are MIT's[1] implementation of the Kerberos 5 authentication protocol. This announcement fixes several vulnerabilities listed in the advisories MITKRB5-SA-2004-001[2], MITKRB5-SA-2004-002[3] and MITKRB5-SA-2004-003[4]: 1. Buffer overflows in krb5_aname_to_localname() (CAN-2004-0523[5]) The krb5_aname_to_localname() library function contains multiple buffer overflows vulnerabilities[5] which could be exploited to gain unauthorized root access. Exploitation of these flaws requires an unusual combination of factors, including successful authentication to a vulnerable service and a non-default configuration on the target service. This announcement updates the correction used to the patch provided by Bill Dodd. 2. Several double-free vulnerabilities in KDC and libraries (CAN-2004-0642[6], CAN-2004-0643[7], CAN-2004-0772[8]) The MIT Kerberos 5 implementation's Key Distribution Center (KDC) program contains a double-free vulnerability that potentially allows a remote attacker to execute arbitrary code. Additionally, double-free vulnerabilities exist in MIT Kerberos 5 library code, making client programs and application servers vulnerable. The vulnerability in krb524d was discovered by Marc Horowitz; the other double-free vulnerabilities were discovered by Will Fiveash and Nico Williams at Sun. 3. ASN.1 decoder denial of service (CAN-2004-0644[9]) Will Fiveash and Nico Williams also found a denial-of-service vulnerability[9] in the ASN.1 decoder library in the MIT Kerberos 5 distribution which could lead to an infinite loop in the decoder, allowing an unauthenticated remote attacker to cause a KDC or application server to hang inside an infinite loop and an attacker impersonating a legitimate KDC or application server to cause a client program to hang inside an infinite loop. SOLUTION It is recommended that all Kerberos users in Conectiva Linux upgrade their packages. Please note that the service will be automatically restarted after the upgrade if it was already running. Several applications can make use of the Kerberos libraries. Those applications have to be restarted as well. REFERENCES 1.http://web.mit.edu/Kerberos/www/index.html 2.http://web.mit.edu/Kerberos/www/advisories/MITKRB5-SA-2004-001-an_to_ln.txt 3.http://web.mit.edu/Kerberos/www/advisories/MITKRB5-SA-2004-002-dblfree.txt 4.http://web.mit.edu/Kerberos/www/advisories/MITKRB5-SA-2004-003-asn1.txt 5.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0523 6.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0642 7.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0643 8.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0772 9.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0644 UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/10/SRPMS/krb5-1.3.3-62470U10_2cl.src.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-server-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-apps-servers-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-devel-static-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-client-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-doc-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-devel-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-apps-clients-1.3.3-62470U10_2cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/SRPMS/krb5-1.2.7-28721U90_3cl.src.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-devel-static-1.2.7-28721U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-devel-1.2.7-28721U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-client-1.2.7-28721U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-doc-1.2.7-28721U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-apps-clients-1.2.7-28721U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-1.2.7-28721U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-apps-servers-1.2.7-28721U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-server-1.2.7-28721U90_3cl.i386.rpm ADDITIONAL INSTRUCTIONS The apt tool can be used to perform RPM packages upgrades: - run: apt-get update - after that, execute: apt-get upgrade Detailed instructions regarding 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 - ------------------------------------------------------------------------- Copyright (c) 2004 Conectiva Inc. http://www.conectiva.com - ------------------------------------------------------------------------- subscribe: conectiva-updates-subscribe@...aleguas.conectiva.com.br unsubscribe: conectiva-updates-unsubscribe@...aleguas.conectiva.com.br -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQFBQO0d42jd0JmAcZARAhQWAJ9XTIOwgf+6dapxACFPabt64qBWdACdHjsx KFGcVXgw29vt/C5QdBBRh/o= =RNsz -----END PGP SIGNATURE-----
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