Multiple Vulnerabilities in ssmtp
Gentoo Linux Security Advisory
||GLSA 200404-18 / ssmtp
||April 26, 2004
||April 26, 2004: 01
All supported architectures
There are multiple format string vulnerabilities in the SSMTP package,
which may allow an attacker to run arbitrary code with ssmtp's privileges
SSMTP is a very simple mail transfer agent (MTA) that relays mail from the
local machine to another SMTP host. It is not designed to function as a
full mail server; its sole purpose is to relay mail.
There are two format string vulnerabilities inside the log_event() and
die() functions of ssmtp. Strings from outside ssmtp are passed to various
printf()-like functions from within log_event() and die() as format
strings. An attacker could cause a specially-crafted string to be passed to
these functions, and potentially cause ssmtp to execute arbitrary code.
If ssmtp connects to a malicious mail relay server, this vulnerability can
be used to execute code with the rights of the mail sender, including root.
There is no known workaround at this time. All users are advised to upgrade
to the latest available version of ssmtp.
All users are advised to upgrade to the latest available version of ssmtp.
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=mail-mta/ssmtp-2.60.7"
# emerge ">=mail-mta/ssmtp-2.60.7"