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Red Hat Enterprise Linux 6: RHSA-2013:0720-02 Stunnel Memory Leak Fix

red hat
Calendar Grey April 8, 2013
Dist Redhat Esm H88
A new stunnel release for Fedora addresses a significant security vulnerability that affects TLS functionalities and Kerberos authentication.
An updated stunnel package that fixes one security issue is now available for Red Hat Enterprise Linux 6

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

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.

Topics%20covered

Topics Covered

security advisory moderate Red Hat buffer overflow stunnel man-in-the-middle NTLM

References

https://access.redhat.com/security/cve/CVE-2013-1762 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


Advisory ID: RHSA-2013:0714-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2013:0714.html
Issue date: 2013-04-08

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.

Topics%20covered

Topics Covered

security advisory moderate Red Hat buffer overflow stunnel man-in-the-middle NTLM

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

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