Red Hat: 2013:0714-01: stunnel: Moderate Advisory
Summary
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.
Summary
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
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
Package List
Red Hat Enterprise Linux Desktop (v. 6):
Source:
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:
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:
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:
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
Topic
An updated stunnel package that fixes one security issue is now availablefor Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.
Topic
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
Bugs Fixed
917839 - CVE-2013-1762 Stunnel: buffer overflow vulnerability due to incorrect integer conversion in the NTLM authentication of the CONNECT protocol negotiation