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UNIRAS Brief - 496/04 - Two Conectiva Security Announcements
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UNIRAS (UK Govt CERT) Briefing Notice - 496/04 dated 13.09.04 Time: 11:00
UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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UNIRAS material is also available from its website at www.uniras.gov.uk and
Information about NISCC is available from www.niscc.gov.uk
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Title
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Two Conectiva Security Announcements:
1. Multiple vulnerabilities in Kerberos 5.
2. Fix for buffer overflow vulnerability in wv.
Detail
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1. 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].
2. iDefense[2] discovered[3] a buffer overflow vulnerability[4] in the
wv library which could allow an attacker to execute arbitrary code
with the privileges of the user running the vulnerable application.
1.
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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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subscribe: conectiva-updates-subscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
unsubscribe: conectiva-updates-unsubscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
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2.
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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : wv
SUMMARY : Fix for buffer overflow vulnerability
DATE : 2004-09-10 17:35:00
ID : CLA-2004:863
RELEVANT
RELEASES : 10
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DESCRIPTION
Wv[1] is a library which allows access to Microsoft Word files.
iDefense[2] discovered[3] a buffer overflow vulnerability[4] in the wv library which could allow an attacker to execute arbitrary code with the privileges of the user running the vulnerable application.
SOLUTION
It is recommended that all wv users in Conectiva Linux upgrade their packages.
IMPORTANT: all applications linked against libwv must be restarted after the upgrade in order to close the vulnerabilities.
REFERENCES
1.http://wvware.sourceforge.net/
2.http://www.idefense.com/ 3.http://www.idefense.com/application/poi/display?id=115&type=vulnerabilities&flashstatus=true
4.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0645
UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/10/SRPMS/wv-1.0.0-39238U10_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/libwv7-1.0.0-39238U10_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/wv-1.0.0-39238U10_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/wv-devel-1.0.0-39238U10_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/wv-devel-static-1.0.0-39238U10_1cl.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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subscribe: conectiva-updates-subscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
unsubscribe: conectiva-updates-unsubscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
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Tel: +44 (0) 870 487 0748 and follow the prompts
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UNIRAS wishes to acknowledge the contributions of Conectiva for the information
contained in this Briefing.
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This Briefing contains the information released by the original author. Some
of the information may have changed since it was released. If the vulnerability
affects you, it may be prudent to retrieve the advisory from the canonical site
to ensure that you receive the most current information concerning that problem.
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UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST)
and has contacts with other international Incident Response Teams (IRTs) in
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rapid reaction to incidents, and to promote information sharing amongst its
members and the community at large.
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<End of UNIRAS Briefing>
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