[CLA-2003:766] Conectiva Security Announcement - gdm

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Date: Fri, 17 Oct 2003 15:49:39 -0200
To: conectiva-updates@papaleguas.conectiva.com.br, lwn@lwn.net, bugtraq@securityfocus.com, security-alerts@linuxsecurity.com, linsec@lists.seifried.org

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : gdm
SUMMARY : Local denial of service vulnerabilities
DATE : 2003-10-17 15:46:00
ID : CLA-2003:766
RELEVANT
RELEASES : 8, 9

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DESCRIPTION
 GDM[1] is the Gnome display manager used for graphical logins.
 
 Jarno Gassenbauer found two local denial of service vulnerabilites in
 GDM, both fixed in the versions 2.4.4.4, 2.4.1.7 and in the packages
 released with this advisory:
 
 - GDM does not impose a size limit to its receive buffer (which is
 dynamically allocated). An attacker can exploit this vulnerability by
 sending an arbitrary number of bytes to GDM so that the memory will
 be exausted and the kernel will terminate the GDM process.
 
 - GDM does not control the number nor imposes a timeout when queried
 for commands (like calls for version string, authentication, etc). An
 attacker can connect to gdm, send a command and never read the
 answer, thus causing gdm to fill its send buffer and stop accepting
 new, valid, logins.
 
 The Common Vulnerabilities and Exposures project (cve.mitre.org) has
 assigned the names CAN-2003-0793 and CAN-2003-0794, respectively, to
 these issues.

SOLUTION
 It is recommended that all GDM users upgrade their packages.
 
 IMPORTANT: after the upgrade, the GDM service has to be restarted if
 it was being used. One way to do so is to run the following commands
 as root:
 
 # init 3
 
 This will take the system to text-mode login. After that, execute:
 
 # init 5
 
 to take the system back to graphic-mode login.
 
 
 REFERENCES
 1.http://www.5z.com/jirka/gdm.html
 2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0793
 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0794

UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/RPMS/gdm-2.2.5.4-3U80_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/gdm-2.2.5.4-3U80_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gdm-2.4.1.6-27238U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/gdm-2.4.1.6-27238U90_2cl.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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