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Home » Hacking News » Conectiva CLA-2003:628: vixie-cron

Conectiva CLA-2003:628: vixie-cron

by Nikola Strahija on April 24th, 2003 A vulnerability has been found in the Vixie-cron program which, if exploited, could allow a local attacker to gain root privileges.


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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : vixie-cron
SUMMARY : Local vulnerability
DATE : 2003-04-17 16:01:00
ID : CLA-2003:628
RELEVANT
RELEASES : 6.0, 7.0, 8

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DESCRIPTION
The vixie-cron package contains the Vixie version of cron. Cron is a
standard UNIX daemon that runs specified programs at scheduled
times.

The ISS X-Force team found a local vulnerability[1] in vixie-cron
that may allow users to obtain root privileges in a system running
it. The crontab utility, which is part of the vixie-cron package and
is suid root, is used by local users to schedule their jobs. Due to a
failure in the dropping of root privileges in certain circumstances,
it is possible for an attacker to gain root privileges by exploiting
this vulnerability.

The Common Vulnerabilities and Exposures (CVE) project has assigned
the name CVE-2001-0559 to this issue[2].

This update corrects this vulnerability and adds a fix[3] for a
problem regarding a leak of read-only file descriptors of the
/etc/cron.allow and /etc/cron.deny files to the users' text editor
during crontab modifications. Although these files are not
distributed with Conectiva Linux, the system administrator can create
them to restrict access to the cron service.

Conectiva Linux 6.0 users are also vulnerable to some buffer overflow
vulnerabilities[3] that can be exploited by local users. This update
also fixes these issues.


SOLUTION
All users should upgrade.


REFERENCES:
1.http://www.iss.net/security_center/static/6508.php
2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0559
3.http://distro2.conectiva.com.br/bugzilla/show_bug.cgi?id=7852


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/vixie-cron-3.0.1-43U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/vixie-cron-3.0.1-43U60_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/vixie-cron-3.0.1-50U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/vixie-cron-3.0.1-50U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/vixie-cron-3.0.1-50U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/vixie-cron-3.0.1-50U80_1cl.src.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 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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Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

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subscribe: [email protected]
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