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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: stunnel security update
Advisory ID:       RHSA-2013:0714-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0714.html
Issue date:        2013-04-08
CVE Names:         CVE-2013-1762 
=====================================================================

1. Summary:

An updated stunnel package that fixes one security issue is now available
for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

stunnel is a socket wrapper which can provide SSL (Secure Sockets Layer)
support to ordinary applications. For example, it can be used in
conjunction with imapd to create an SSL-secure IMAP server.

An integer conversion issue was found in stunnel when using Microsoft NT
LAN Manager (NTLM) authentication with the HTTP CONNECT tunneling method.
With this configuration, and using stunnel in SSL client mode on a 64-bit
system, an attacker could possibly execute arbitrary code with the
privileges of the stunnel process via a man-in-the-middle attack or by
tricking a user into using a malicious proxy. (CVE-2013-1762)

All stunnel users should upgrade to this updated package, which contains a
backported patch to correct this issue.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

917839 - CVE-2013-1762 Stunnel: buffer overflow vulnerability due to incorrect
 integer conversion in the NTLM authentication of the CONNECT protocol negotiation

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
stunnel-4.29-3.el6_4.src.rpm

i386:
stunnel-4.29-3.el6_4.i686.rpm
stunnel-debuginfo-4.29-3.el6_4.i686.rpm

x86_64:
stunnel-4.29-3.el6_4.x86_64.rpm
stunnel-debuginfo-4.29-3.el6_4.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
stunnel-4.29-3.el6_4.src.rpm

x86_64:
stunnel-4.29-3.el6_4.x86_64.rpm
stunnel-debuginfo-4.29-3.el6_4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
stunnel-4.29-3.el6_4.src.rpm

i386:
stunnel-4.29-3.el6_4.i686.rpm
stunnel-debuginfo-4.29-3.el6_4.i686.rpm

ppc64:
stunnel-4.29-3.el6_4.ppc64.rpm
stunnel-debuginfo-4.29-3.el6_4.ppc64.rpm

s390x:
stunnel-4.29-3.el6_4.s390x.rpm
stunnel-debuginfo-4.29-3.el6_4.s390x.rpm

x86_64:
stunnel-4.29-3.el6_4.x86_64.rpm
stunnel-debuginfo-4.29-3.el6_4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
stunnel-4.29-3.el6_4.src.rpm

i386:
stunnel-4.29-3.el6_4.i686.rpm
stunnel-debuginfo-4.29-3.el6_4.i686.rpm

x86_64:
stunnel-4.29-3.el6_4.x86_64.rpm
stunnel-debuginfo-4.29-3.el6_4.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2013-1762.html
https://access.redhat.com/security/updates/classification/#moderate
https://www.stunnel.org/CVE-2013-1762.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2013 Red Hat, Inc.
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