__________________________________________________________

                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
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             __________________________________________________________

                             INFORMATION BULLETIN

                       Sudo - "Sudoedit" Vulnerabilities
                              [Sudo announcement]

September 21, 2004 17:00 GMT                                      Number O-219
______________________________________________________________________________
PROBLEM:       Sudoedit in Sudo v1.6.8 has a vulnerability that can allow the  
               exposure of sensitive information. 
SOFTWARE:      Sudo v1.6.8 
DAMAGE:        File contents may be accessible by unauthorized local users. 
SOLUTION:      Update to Sudo version 1.6.8pl. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. Local users could possibly get root 
ASSESSMENT:    privileges. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/o-219.shtml 
 ORIGINAL BULLETIN:  http://www.sudo.ws/sudo/alerts/sudoedit.html 
______________________________________________________________________________
[***** Start Sudo announcement *****]

Sudoedit can expose file contents

Summary:
A flaw in exists in sudo's -u option (aka sudoedit) in sudo version 1.6.8 that 
can give an attacker read permission to a file that would otherwise be 
unreadable.

Sudo versions affected:
1.6.8 only

Details:
While sudoedit runs the actual editor as the invoking user, the temporary file 
is then re-opened with root privileges. An attacker can run sudoedit, remove 
the editor temporary file, make a link to an unreadable file with the same 
name as the old temporary file and quit the editor. The file being edited via 
sudoedit will now contain a copy of the previously unreadable file.

Impact:
Exploitation of the bug requires that the sudoers file be configured to allow 
the attacker to run sudoedit. If no users have been granted access to sudoedit 
there is no impact.

Fix:
The bug is fixed in sudo 1.6.8p1.

Credit:
This problem was brought to my attention by Reznic Valery.

Copyright © 2004 GratiSoft, Inc.

[***** End Sudo announcement *****]
_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of GratiSoft, Inc.  for the 
information contained in this bulletin.
_______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
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