[CLA-2004:860] Conectiva Security Announcement - krb5
Date: Thu, 9 Sep 2004 20:54:06 -0300
From: Conectiva Updates <[email protected]>
To: [email protected], [email protected],
Subject: [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_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
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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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