[RHSA-2015:1768-01] Low: libunwind security update

[bugzilla at redhat.com]

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                   Red Hat Security Advisory

Synopsis:          Low: libunwind security update
Advisory ID:       RHSA-2015:1768-01
Product:           Red Hat Enterprise Linux OpenStack Platform
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1768.html
Issue date:        2015-09-10
CVE Names:         CVE-2015-3239 
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1. Summary:

Updated libunwind packages that fix one security issue are now available
for Red Hat Enterprise Linux OpenStack Platform 5.0 for Red Hat Enterprise
Linux 6.

Red Hat Product Security has rated this update as having Low 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 OpenStack Platform 5.0 for RHEL 6 - x86_64

3. Description:

Libunwind provides a C ABI to determine the call-chain of a program.

An off-by-one array indexing error was found in the libunwind API, which
could cause an error when reading untrusted binaries or dwarf debug info
data. Red Hat products do not call the API in this way; and it is unlikely
that any exploitable attack vector exists in current builds or supported
usage. (CVE-2015-3239)

This issue was discovered by Paolo Bonzini of Red Hat.

All users of libunwind are advised to upgrade to these updated packages,
which contain 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.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1232265 - CVE-2015-3239 libunwind: off-by-one in dwarf_to_unw_regnum()

6. Package List:

Red Hat Enterprise Linux OpenStack Platform 5.0 for RHEL 6:

Source:
libunwind-1.1-4.1.el6ost.src.rpm

x86_64:
libunwind-1.1-4.1.el6ost.x86_64.rpm
libunwind-debuginfo-1.1-4.1.el6ost.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/

7. References:

https://access.redhat.com/security/cve/CVE-2015-3239
https://access.redhat.com/security/updates/classification/#low

8. Contact:

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

Copyright 2015 Red Hat, Inc.
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