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Vigil@nce: GNOME Display Manager, reading password

July 2010 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

When a GNOME Display Manager user entered a password containing a
special character, it is displayed in a log file.

 Severity: 1/4
 Creation date: 29/07/2010

DESCRIPTION OF THE VULNERABILITY

The gdmlogin process of GNOME Display Manager receives the login
and the password entered by the user.

The ve_locale_from_utf8() function decodes UTF-8 stirngs. If a
string contains an invalid character, an error message is
displayed:
string not in proper utf8 encoding: here_the_string
This error message is displayed in the /var/log/messages log file,
which is readable by all users.

When the user inadvertently enters a special character in his
password, the log file thus contains this wrong password (in most
cases, it is similar to the real password).

When a GNOME Display Manager user entered a password containing a
special character, a local attacker can therefore read the log
file, and then guess the password.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/GNOME-Display-Manager-reading-password-9795


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