[CLA-2002:515] Conectiva Linux Security Announcement - krb5

From: secure@conectiva.com.br
Date: 08/07/02

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Date: Wed, 7 Aug 2002 15:30:50 -0300
To: conectiva-updates@papaleguas.conectiva.com.br, lwn@lwn.net, bugtraq@securityfocus.com, security-alerts@linuxsecurity.com
From: secure@conectiva.com.br

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : krb5
SUMMARY : Integer overflow in Kerberos' remote administration service
DATE : 2002-08-07 15:29:00
ID : CLA-2002:515
RELEVANT
RELEASES : 8

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DESCRIPTION
The "krb5" packages are MIT's implementation of the Kerberos 5
authentication protocol.

There is a vulnerability[1][2][3] present in the remote
administration service, "kadmind", that could potentially be used by
an attacker to execute arbitrary commands with administrator
privileges.

The vulnerability lies in the RPC library, derived from SunRPC, used
by this service. An unchecked multiplication could lead to an integer
overflow which would result in memory being incorrectly allocated and
potential buffer overflows.

SOLUTION
It is recommended that all kerberos 5 remote administration users
upgrade their packages. The kadmind service will be automatically
restarted after the upgrade if it was already running.

If an upgrade is not possible at this time, administrators should
shut down the "kadmind" service or control access to it via packet
filters or other means. To shut down the kadmind service, execute the
following command as root:

/sbin/service kadmind stop

Please note the remote administration service "kadmind" is not
enabled by default.

REFERENCES
1.http://web.mit.edu/Kerberos/www/advisories/MITKRB5-SA-2002-001-xdr.txt
2.http://www.cert.org/advisories/CA-2002-25.html
3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0391

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

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

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Previous message: John Howie: "RE: White paper: Exploiting the Win32 API."
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