nbSMTP: Format string vulnerability

Background

nbSMTP is an SMTP client suitable to run in chroot jails, in embedded systems, laptops and workstations.

Description

Niels Heinen discovered a format string vulnerability.

Impact

An attacker can setup a malicious SMTP server and exploit this vulnerability to execute arbitrary code with the permissions of the user running nbSMTP.

Workaround

There is no known workaround at this time.

Resolution

All nbSMTP users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=mail-mta/nbsmtp-1.0"