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Category: Application (Generic) > Sudo

Vendors: Miller, Todd C.

(Conectiva Issues Fix) Sudo Utility Has Heap Overflow That May Let Local Users Execute Arbitrary Code with Root Privileges

SecurityTracker Alert ID: 1004170

CVE Reference: CVE-2002-0184 (Links to External Site)

Updated: Nov 20 2003

Original Entry Date: Apr 27 2002

Impact: Execution of arbitrary code via local system, Root access via local system

Fix Available: Yes Vendor Confirmed: Yes

Version(s): 1.6.5p2 and prior

Description: A vulnerability has been reported in the sudo utility. A local user may be able to obtain root privileges.

Global InterSec reported an off-by-five heap overflow in 'sudo'. A local user can apparently call sudo with a specially formatted argument for the -p command line option to trigger the overflow. It is reported that sudo may not correctly allocate memory when parsing the '%h' (hostname) or '%u' (username) strings in the argument in some situations. A local user could potentially trigger the overflow and execute arbitrary code with root privileges.

The exact nature of the conditions required to exploit this flaw were not provided. However, it is reported that the compile-time options and the length of the hostname may affect whether the application is vulnerable or not.

Impact: A local user may be able to execute arbitrary code with root privileges in certain situations.

Vendor URL: www.courtesan.com/sudo/ (Links to External Site)

Cause: Boundary error

Underlying OS: Linux (Conectiva)

Underlying OS Comments: 5.0, prg graficos, ecommerce, 5.1, 6.0, 7.0, 8

Reported By: secure@conectiva.com.br

Message History: This archive entry is a follow-up to the message listed below.

Apr 25 2002

Sudo Utility Has Heap Overflow That May Let Local Users Execute Arbitrary Code with Root Privileges

Source Message Contents

Date: Fri, 26 Apr 2002 12:04:34 -0300
From: secure@conectiva.com.br
Subject: [conectiva-updates] [CLA-2002:475] Conectiva Linux Security Announcement - sudo

 

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

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

PACKAGE   : sudo
SUMMARY   : Buffer overflow vulnerability
DATE      : 2002-04-26 12:01:00
ID        : CLA-2002:475
RELEVANT
RELEASES  : 5.0, prg graficos, ecommerce, 5.1, 6.0, 7.0, 8

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

DESCRIPTION
 "sudo"[1] is an utility designed to be used by administrators who
 wish to delegate administrative privileges to regular users for very
 specific commands, and without giving away the root password. 
 
 Global InterSec published[3] an advisory about a memory heap
 corruption vulnerability[2] in sudo. This vulnerability could
 possibly be used by local attackers to obtain root privileges.
 
 Sudo allows users to specify the password prompt they receive. This
 prompt can contain macros (such as %h) that will be expanded by sudo.
 Sudo can be tricked into allocating the wrong ammount of memory for
 this prompt.


SOLUTION
 It is recommended that all sudo users upgrade their packages.
 
 REFERENCES
 1. http://www.courtesan.com/sudo/
 2.http://www.courtesan.com/pipermail/sudo-announce/2002-April/000020.html
 3. http://www.globalintersec.com/adv/sudo-2002041701.txt


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/sudo-1.6.6-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/sudo-1.6.6-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/sudo-doc-1.6.6-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/sudo-1.6.6-1U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/sudo-1.6.6-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/sudo-doc-1.6.6-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/sudo-1.6.6-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/sudo-1.6.6-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/sudo-doc-1.6.6-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/sudo-1.6.6-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/sudo-1.6.6-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/sudo-doc-1.6.6-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/sudo-1.6.6-1U8_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/sudo-1.6.6-1U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/sudo-doc-1.6.6-1U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/sudo-1.6.6-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/sudo-1.6.6-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/sudo-doc-1.6.6-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/sudo-1.6.6-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/sudo-1.6.6-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/sudo-doc-1.6.6-1U50_1cl.i386.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


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

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Comment: For info see http://www.gnupg.org

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