Date: Thu, 12 Sep 2002 15:55:14 -0300
From: secure@conectiva.com.br
To: conectiva-updates@papaleguas.conectiva.com.br, lwn@lwn.net,
Subject: [CLA-2002:523] Conectiva Linux Security Announcement - util-linux
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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : util-linux
SUMMARY : Local root vulnerability in chfn
DATE : 2002-09-12 15:54:00
ID : CLA-2002:523
RELEVANT
RELEASES : 6.0, 7.0, 8
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DESCRIPTION
The util-linux package contains a large variety of system
utilities that are necessary for a Linux system to function.
Among many features, it includes the chfn utility, a suid root tool
used to change user account information.
Michal Zalewski found a race condition vulnerability[1] in the way
chfn locks files when changing /etc/passwd. In order to sucessfully
exploit this vulnerability, some administrator interaction is needed
and there are some prerequisites to fulfill. Full details can be
found in the Bindview advisory[2].
Having what appears to be a stale /etc/ptmptmp file could be a sign
that the vulnerability is being exploited. In that case, the
administrator should investigate current users and processes before
attemtping to remove this file.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0638 to this issue[3].
Please note that the fixed packages were available in our ftp servers
since September 2nd, 2002.
SOLUTION
All users should upgrade.
REFERENCES:
1.http://www.kb.cert.org/vuls/id/405955
2.http://razor.bindview.com/publish/advisories/adv_chfn.html
3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0638
4.http://distro.conectiva.com.br/bugzilla/show_bug.cgi?id=6401
DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/util-linux-2.10o-2U60_1cl.i386.rpmftp://atualizacoes.conectiva.com.br/6.0/SRPMS/util-linux-2.10o-2U60_1cl.src.rpmftp://atualizacoes.conectiva.com.br/7.0/RPMS/util-linux-2.10s-4U70_1cl.i386.rpmftp://atualizacoes.conectiva.com.br/7.0/SRPMS/util-linux-2.10s-4U70_1cl.src.rpmftp://atualizacoes.conectiva.com.br/8/RPMS/util-linux-2.11n-4U80_1cl.i386.rpmftp://atualizacoes.conectiva.com.br/8/SRPMS/util-linux-2.11n-4U80_1cl.src.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
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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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