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Gentoo Linux Security Advisory                           GLSA 200404-18
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                                            https://security.gentoo.org/
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  Severity: High
     Title: Multiple Vulnerabilities in ssmtp
      Date: April 26, 2004
      Bugs: #47918, #48435
        ID: 200404-18

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Synopsis
=======
There are multiple format string vulnerabilities in the SSMTP package,
which may allow an attacker to run arbitrary code with ssmtp's
privileges (potentially root).

Background
=========
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.

Affected packages
================
    -------------------------------------------------------------------
     Package         /    Vulnerable    /                   Unaffected
    -------------------------------------------------------------------
  1  net-mail/ssmtp      <= 2.60.4-r2                        >= 2.60.7

Description
==========
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.

Impact
=====
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.

Workaround
=========
There is no known workaround at this time. All users are advised to
upgrade to the latest available version of ssmtp.

Resolution
=========
All users are advised to upgrade to the latest available version of
ssmtp.

    # emerge sync

    # emerge -pv ">=net-mail/ssmtp-2.60.7"
    # emerge ">=net-mail/ssmtp-2.60.7"

References
=========
  [ 1 ] Secunia Advisory
        https://www.flexera.com/products/software-vulnerability-research/secunia-research
  [ 2 ] CVE Reference
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0156
  [ 3 ] Debian Advisory
        https://lists.debian.org/debian-security-announce/2004/msg00084.html

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

     https://security.gentoo.org/glsa/200404-18

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org/.

License
======
Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/1.0/