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Home » Hacking News » CLA-2002:534-Conectiva Linux Security Announcement - krb5

CLA-2002:534-Conectiva Linux Security Announcement - krb5

by Nikola Strahija on November 7th, 2002 The "krb5" packages are MIT's[1] implementation of the Kerberos 5 authentication protocol. There is a buffer overflow vulnerability[2][3] in the Kerberos 4 remote administration service (kadmind4) that could be used by a remote attacker to execute arbitrary commands on the server with root privileges.


The daemon which implements this service, kadmind4, is included in
our krb5-server package, but not used by default. The package
defaults to using the kadmind daemon, which is not vulnerable to this
problem. Only administrators who explicitly run kadmind4 will be at
risk.

The authors released an advisory[2] with a patch which fixes the
vulnerability. This patch has been applied to the updated packages
below.


SOLUTION
All Kerberos users should upgrade their packages immediately.

IMPORTANT: if the kadmind4 daemon is in use, it needs to be manually
restarted after upgrading the packages.


REFERENCES
1.http://web.mit.edu/Kerberos/www/index.html
2.http://web.mit.edu/Kerberos/www/advisories/MITKRB5-SA-2002-002-kadm4.txt
3.http://www.cert.org/advisories/CA-2002-29.html
4.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1235


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/SRPMS/krb5-1.2.3-3U8_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-1.2.3-3U8_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-apps-clients-1.2.3-3U8_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-apps-servers-1.2.3-3U8_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-client-1.2.3-3U8_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-devel-1.2.3-3U8_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-devel-static-1.2.3-3U8_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-doc-1.2.3-3U8_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/krb5-server-1.2.3-3U8_3cl.i386.rpm


ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:
- add the following line to /etc/apt/sources.list if it is not there yet
(you may also use linuxconf to do this):

rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

- 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

- -------------------------------------------------------------------------
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