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Vigil@nce - FreeBSD: buffer overflow via .login_conf.db

August 2010 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can use a specially malformed .login_conf.db file in
order to elevate his privileges.

Severity: 2/4

Creation date: 10/08/2010

DESCRIPTION OF THE VULNERABILITY

The /etc/login.conf file contains configuration directives for
user accounts, using key/value pairs. For example:
me:\
:coredumpsize=1024:\
:maxproc=infinity:

Each user can have a .login_conf file located in his home
directory to define customized values. The .login_conf file is
converted to a Berkeley database named /.login_conf.db.

These files are read by /usr/bin/login when the user authenticates
to a service. However, if the size of a key/value of the
 /.login_conf.db file is too large, a buffer overflow occurs.

An attacker can therefore use a specially malformed .login_conf.db
file in order to elevate his privileges.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/FreeBSD-buffer-overflow-via-login-conf-db-9821


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