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

Synopsis:          Critical: nss security update
Advisory ID:       RHSA-2017:1101-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1101
Issue date:        2017-04-20
CVE Names:         CVE-2017-5461 
=====================================================================

1. Summary:

An update for nss is now available for Red Hat Enterprise Linux 5 Extended
Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact
of Critical. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server (v. 5 ELS) - i386, s390x, x86_64

3. Description:

Network Security Services (NSS) is a set of libraries designed to support
the cross-platform development of security-enabled client and server
applications.

Security Fix(es):

* An out-of-bounds write flaw was found in the way NSS performed certain
Base64-decoding operations. An attacker could use this flaw to create a
specially crafted certificate which, when parsed by NSS, could cause it to
crash or execute arbitrary code, using the permissions of the user running
an application compiled against the NSS library. (CVE-2017-5461)

Red Hat would like to thank the Mozilla project for reporting this issue.
Upstream acknowledges Ronald Crane as the original reporter.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

After installing this update, applications using NSS (for example, Firefox)
must be restarted for this update to take effect.

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

1440080 - CVE-2017-5461 nss: Write beyond bounds caused by bugs in Base64 de/encoding in nssb64d.c and nssb64e.c (MFSA 2017-10)

6. Package List:

Red Hat Enterprise Linux Server (v. 5 ELS):

Source:
nss-3.21.4-1.el5_11.src.rpm

i386:
nss-3.21.4-1.el5_11.i386.rpm
nss-debuginfo-3.21.4-1.el5_11.i386.rpm
nss-devel-3.21.4-1.el5_11.i386.rpm
nss-pkcs11-devel-3.21.4-1.el5_11.i386.rpm
nss-tools-3.21.4-1.el5_11.i386.rpm

s390x:
nss-3.21.4-1.el5_11.s390.rpm
nss-3.21.4-1.el5_11.s390x.rpm
nss-debuginfo-3.21.4-1.el5_11.s390.rpm
nss-debuginfo-3.21.4-1.el5_11.s390x.rpm
nss-devel-3.21.4-1.el5_11.s390.rpm
nss-devel-3.21.4-1.el5_11.s390x.rpm
nss-pkcs11-devel-3.21.4-1.el5_11.s390.rpm
nss-pkcs11-devel-3.21.4-1.el5_11.s390x.rpm
nss-tools-3.21.4-1.el5_11.s390x.rpm

x86_64:
nss-3.21.4-1.el5_11.i386.rpm
nss-3.21.4-1.el5_11.x86_64.rpm
nss-debuginfo-3.21.4-1.el5_11.i386.rpm
nss-debuginfo-3.21.4-1.el5_11.x86_64.rpm
nss-devel-3.21.4-1.el5_11.i386.rpm
nss-devel-3.21.4-1.el5_11.x86_64.rpm
nss-pkcs11-devel-3.21.4-1.el5_11.i386.rpm
nss-pkcs11-devel-3.21.4-1.el5_11.x86_64.rpm
nss-tools-3.21.4-1.el5_11.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-2017-5461
https://access.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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