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Category:   Application (Security)  >   Network Security Services (NSS) Vendors:   Mozilla.org
(Red Hat Issues Fix) Network Security Services (NSS) Null Pointer Dereference in ssl3_GatherData() Lets Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1038581
SecurityTracker URL:  http://securitytracker.com/id/1038581
CVE Reference:   CVE-2017-7502   (Links to External Site)
Date:  May 30 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.24.0 - 3.30.2
Description:   A vulnerability was reported in Network Security Services (NSS). A remote user can cause the target service to crash.

A remote user can send specially crafted (empty) SSLv2 messages to trigger a null pointer dereference in ssl3_GatherData() and cause the target application using Network Security Services (NSS) to crash.

Impact:   A remote user can cause the target application using NSS to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:1364

Vendor URL:  access.redhat.com/errata/RHSA-2017:1364 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
May 30 2017 Network Security Services (NSS) Null Pointer Dereference in ssl3_GatherData() Lets Remote Users Cause the Target Service to Crash



 Source Message Contents

Subject:  [RHSA-2017:1364-01] Important: nss security and bug fix update

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

Synopsis:          Important: nss security and bug fix update
Advisory ID:       RHSA-2017:1364-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1364
Issue date:        2017-05-30
CVE Names:         CVE-2017-7502 
=====================================================================

1. Summary:

An update for nss is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - 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 Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, 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):

* A null pointer dereference flaw was found in the way NSS handled empty
SSLv2 messages. An attacker could use this flaw to crash a server
application compiled against the NSS library. (CVE-2017-7502)

Bug Fix(es):

* The Network Security Services (NSS) code and Certificate Authority (CA)
list have been updated to meet the recommendations as published with the
latest Mozilla Firefox Extended Support Release (ESR). The updated CA list
improves compatibility with the certificates that are used in the Internet
Public Key Infrastructure (PKI). To avoid certificate validation refusals,
Red Hat recommends installing the updated CA list on June 12, 2017.
(BZ#1448488)

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/):

1446631 - CVE-2017-7502 nss: Null pointer dereference when handling empty SSLv2 messages

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
nss-3.28.4-3.el6_9.src.rpm

i386:
nss-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-sysinit-3.28.4-3.el6_9.i686.rpm
nss-tools-3.28.4-3.el6_9.i686.rpm

x86_64:
nss-3.28.4-3.el6_9.i686.rpm
nss-3.28.4-3.el6_9.x86_64.rpm
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-sysinit-3.28.4-3.el6_9.x86_64.rpm
nss-tools-3.28.4-3.el6_9.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-devel-3.28.4-3.el6_9.i686.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.i686.rpm

x86_64:
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-devel-3.28.4-3.el6_9.i686.rpm
nss-devel-3.28.4-3.el6_9.x86_64.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.i686.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.x86_64.rpm

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

Source:
nss-3.28.4-3.el6_9.src.rpm

x86_64:
nss-3.28.4-3.el6_9.i686.rpm
nss-3.28.4-3.el6_9.x86_64.rpm
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-sysinit-3.28.4-3.el6_9.x86_64.rpm
nss-tools-3.28.4-3.el6_9.x86_64.rpm

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

x86_64:
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-devel-3.28.4-3.el6_9.i686.rpm
nss-devel-3.28.4-3.el6_9.x86_64.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.i686.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
nss-3.28.4-3.el6_9.src.rpm

i386:
nss-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-devel-3.28.4-3.el6_9.i686.rpm
nss-sysinit-3.28.4-3.el6_9.i686.rpm
nss-tools-3.28.4-3.el6_9.i686.rpm

ppc64:
nss-3.28.4-3.el6_9.ppc.rpm
nss-3.28.4-3.el6_9.ppc64.rpm
nss-debuginfo-3.28.4-3.el6_9.ppc.rpm
nss-debuginfo-3.28.4-3.el6_9.ppc64.rpm
nss-devel-3.28.4-3.el6_9.ppc.rpm
nss-devel-3.28.4-3.el6_9.ppc64.rpm
nss-sysinit-3.28.4-3.el6_9.ppc64.rpm
nss-tools-3.28.4-3.el6_9.ppc64.rpm

s390x:
nss-3.28.4-3.el6_9.s390.rpm
nss-3.28.4-3.el6_9.s390x.rpm
nss-debuginfo-3.28.4-3.el6_9.s390.rpm
nss-debuginfo-3.28.4-3.el6_9.s390x.rpm
nss-devel-3.28.4-3.el6_9.s390.rpm
nss-devel-3.28.4-3.el6_9.s390x.rpm
nss-sysinit-3.28.4-3.el6_9.s390x.rpm
nss-tools-3.28.4-3.el6_9.s390x.rpm

x86_64:
nss-3.28.4-3.el6_9.i686.rpm
nss-3.28.4-3.el6_9.x86_64.rpm
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-devel-3.28.4-3.el6_9.i686.rpm
nss-devel-3.28.4-3.el6_9.x86_64.rpm
nss-sysinit-3.28.4-3.el6_9.x86_64.rpm
nss-tools-3.28.4-3.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.i686.rpm

ppc64:
nss-debuginfo-3.28.4-3.el6_9.ppc.rpm
nss-debuginfo-3.28.4-3.el6_9.ppc64.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.ppc.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.ppc64.rpm

s390x:
nss-debuginfo-3.28.4-3.el6_9.s390.rpm
nss-debuginfo-3.28.4-3.el6_9.s390x.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.s390.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.s390x.rpm

x86_64:
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.i686.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
nss-3.28.4-3.el6_9.src.rpm

i386:
nss-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-devel-3.28.4-3.el6_9.i686.rpm
nss-sysinit-3.28.4-3.el6_9.i686.rpm
nss-tools-3.28.4-3.el6_9.i686.rpm

x86_64:
nss-3.28.4-3.el6_9.i686.rpm
nss-3.28.4-3.el6_9.x86_64.rpm
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-devel-3.28.4-3.el6_9.i686.rpm
nss-devel-3.28.4-3.el6_9.x86_64.rpm
nss-sysinit-3.28.4-3.el6_9.x86_64.rpm
nss-tools-3.28.4-3.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.i686.rpm

x86_64:
nss-debuginfo-3.28.4-3.el6_9.i686.rpm
nss-debuginfo-3.28.4-3.el6_9.x86_64.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.i686.rpm
nss-pkcs11-devel-3.28.4-3.el6_9.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-2017-7502
https://access.redhat.com/security/updates/classification/#important

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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