SecurityTracker.com
Keep Track of the Latest Vulnerabilities
with SecurityTracker!
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 
Sign Up
Sign Up for Your FREE Weekly SecurityTracker E-mail Alert Summary
Instant Alerts
Buy our Premium Vulnerability Notification Service to receive customized, instant alerts
Affiliates
Put SecurityTracker Vulnerability Alerts on Your Web Site -- It's Free!
Partners
Become a Partner and License Our Database or Notification Service
Report a Bug
Report a vulnerability that you have found to SecurityTracker
bugs
@
securitytracker.com





Category:   Application (Generic)  >   Screen Vendors:   GNU [multiple authors]
(Conectiva Issues Fix) GNU Screen Integer Overflow in 'ansi.c' May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1008771
SecurityTracker URL:  http://securitytracker.com/id/1008771
CVE Reference:   CAN-2003-0972   (Links to External Site)
Date:  Jan 20 2004
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.1, 3.9.15, and prior versions
Description:   A vulnerability was reported in GNU Screen. A local user may be able to execute arbitrary code to gain elevated privileges on the target system.

It is reported that a local user can send 2 to 3 gigabytes of data to a target user's screen to trigger a flaw in 'ansi.c'. A large amount of data can reportedly cause the 'w_NumArgs' signed integer to overflow to a negative value, causing a check to ensure that the number of arguments is less than 'MAXARGS' to fail.

The report indicates that screen is typically installed with set user id (setuid) root user privileges of set group id (setgid) utmp group privileges.

The vendor has reportedly been notified.
Impact:   A local user can execute arbitrary code with the privileges of GNU screen (which may be root user privileges or utmp group privileges, depending on the installation).
Solution:   Conectiva has released a fix.

ftp://atualizacoes.conectiva.com.br/8/SRPMS/screen-3.9.10-2U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/screen-3.9.10-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/screen-3.9.13-24126U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/screen-3.9.13-24126U90_1cl.i386.rpm
Vendor URL:  www.gnu.org/software/screen/screen.html (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Conectiva)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 27 2003 GNU Screen Integer Overflow in 'ansi.c' May Let Local Users Gain Elevated Privileges


 Source Message Contents
Date:  Tue, 20 Jan 2004 08:53:42 -0200
Subject:  [conectiva-updates] [CLA-2004:809] Conectiva Security Announcement - screen


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : screen
SUMMARY   : Fix for screen vulnerability
DATE      : 2004-01-20 08:53:00
ID        : CLA-2004:809
RELEVANT
RELEASES  : 8, 9

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

DESCRIPTION
 Screen[1] is a program which allows the use of several sessions
 inside a single terminal.
 
 Timo Sirainen reported[2] a buffer overflow vulnerability[3] in the
 screen package which could be exploited by an attacker who is able to
 send about 2Gb of data to the user's screen session.
 
 Additionally, a fix for a potential problem with window sizes has
 been incorporated in these updated packages.
 
 Please note that screen is not installed setuid/setgid.


SOLUTION
 It is recommended that all screen users upgrade their packages.
 
 
 REFERENCES
 1. http://www.gnu.org/software/screen/
 2. http://marc.theaimsgroup.com/?l=bugtraq&m=106995837813873&w=2
 3. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0972


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/SRPMS/screen-3.9.10-2U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/screen-3.9.10-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/screen-3.9.13-24126U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/screen-3.9.13-24126U90_1cl.i386.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

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

- -------------------------------------------------------------------------
Copyright (c) 2004 Conectiva Inc.
http://www.conectiva.com

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQFADQi142jd0JmAcZARAkUPAKCBlgb3eJMPGUJd2jVNnym5yGR6PwCZAWQm
O9oKN+dLAyr3JbRv9nWjY/0=
=6Dq8
-----END PGP SIGNATURE-----


Go to the Top of This SecurityTracker Archive Page



Home   |    View Topics   |    Search   |    Contact Us

Copyright 2012, SecurityGlobal.net LLC