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TUCoPS :: Linux :: Conectiva :: hack3559.htm

krb5 vulnerability



[CLA-2004:860] Conectiva Security Announcement - krb5

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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : krb5
SUMMARY   : Multiple vulnerabilities in Kerberos 5
DATE      : 2004-09-09 20:53:00
ID        : CLA-2004:860
RELEVANT
RELEASES  : 9, 10

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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_2 cl.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-1.3.3-62470 U10_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-1.3.3-6 2470U10_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-client-1.3.3-62470U 10_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-doc-1.3.3-62470U1 0_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-devel-1.3.3-62470U 10_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/krb5-apps-clients-1.3.3-6 2470U10_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-1.2.7-28 721U90_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-devel-1.2.7-28721U9 0_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-client-1.2.7-28721U9 0_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-1.2.7-28 721U90_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-1.2.7-28721U90_3cl.i 386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-apps-servers-1.2.7-2 8721U90_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/krb5-server-1.2.7-28721U 90_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 

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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 

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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en 

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Copyright (c) 2004 Conectiva Inc.
http://www.conectiva.com 

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