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Category:   Application (Security)  >   Network Security Services (NSS) Vendors:   Mozilla.org
(Red Hat Issues Fix) Network Security Services SSLv2 ClientHello Processing May Let Remote Users Obtain Potentially Sensitive Information on the Target System
SecurityTracker Alert ID:  1041818
SecurityTracker URL:  http://securitytracker.com/id/1041818
CVE Reference:   CVE-2018-12384   (Links to External Site)
Date:  Oct 9 2018
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Network Security Services (NSS). A remote user can obtain potentially sensitive information on the target system.

On systems that compile the NSS library with a server application, a remote user can use an SSLv2-compatible ClientHello message to conduct a passive relay attack against stream ciphers that reply with a ServerHello message using all-zero random data.

The Mozilla project reported this vulnerability.

Impact:   A remote user can obtain potentially sensitive information on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:2898

Vendor URL:  access.redhat.com/errata/RHSA-2018:2898 (Links to External Site)
Cause:   Randomization 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.
Sep 25 2018 Network Security Services SSLv2 ClientHello Processing May Let Remote Users Obtain Potentially Sensitive Information on the Target System



 Source Message Contents

Subject:  [RHSA-2018:2898-01] Moderate: nss security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

Synopsis:          Moderate: nss security update
Advisory ID:       RHSA-2018:2898-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2898
Issue date:        2018-10-09
CVE Names:         CVE-2018-12384 
=====================================================================

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 Moderate. 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):

* nss: ServerHello.random is all zeros when handling a v2-compatible
ClientHello (CVE-2018-12384)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank the Mozilla project for reporting this issue.

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/):

1622089 - CVE-2018-12384 nss: ServerHello.random is all zeros when handling a v2-compatible ClientHello

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
nss-3.36.0-9.el6_10.src.rpm

i386:
nss-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-sysinit-3.36.0-9.el6_10.i686.rpm
nss-tools-3.36.0-9.el6_10.i686.rpm

x86_64:
nss-3.36.0-9.el6_10.i686.rpm
nss-3.36.0-9.el6_10.x86_64.rpm
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-sysinit-3.36.0-9.el6_10.x86_64.rpm
nss-tools-3.36.0-9.el6_10.x86_64.rpm

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

i386:
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-devel-3.36.0-9.el6_10.i686.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.i686.rpm

x86_64:
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-devel-3.36.0-9.el6_10.i686.rpm
nss-devel-3.36.0-9.el6_10.x86_64.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.i686.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.x86_64.rpm

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

Source:
nss-3.36.0-9.el6_10.src.rpm

x86_64:
nss-3.36.0-9.el6_10.i686.rpm
nss-3.36.0-9.el6_10.x86_64.rpm
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-sysinit-3.36.0-9.el6_10.x86_64.rpm
nss-tools-3.36.0-9.el6_10.x86_64.rpm

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

x86_64:
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-devel-3.36.0-9.el6_10.i686.rpm
nss-devel-3.36.0-9.el6_10.x86_64.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.i686.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
nss-3.36.0-9.el6_10.src.rpm

i386:
nss-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-devel-3.36.0-9.el6_10.i686.rpm
nss-sysinit-3.36.0-9.el6_10.i686.rpm
nss-tools-3.36.0-9.el6_10.i686.rpm

ppc64:
nss-3.36.0-9.el6_10.ppc.rpm
nss-3.36.0-9.el6_10.ppc64.rpm
nss-debuginfo-3.36.0-9.el6_10.ppc.rpm
nss-debuginfo-3.36.0-9.el6_10.ppc64.rpm
nss-devel-3.36.0-9.el6_10.ppc.rpm
nss-devel-3.36.0-9.el6_10.ppc64.rpm
nss-sysinit-3.36.0-9.el6_10.ppc64.rpm
nss-tools-3.36.0-9.el6_10.ppc64.rpm

s390x:
nss-3.36.0-9.el6_10.s390.rpm
nss-3.36.0-9.el6_10.s390x.rpm
nss-debuginfo-3.36.0-9.el6_10.s390.rpm
nss-debuginfo-3.36.0-9.el6_10.s390x.rpm
nss-devel-3.36.0-9.el6_10.s390.rpm
nss-devel-3.36.0-9.el6_10.s390x.rpm
nss-sysinit-3.36.0-9.el6_10.s390x.rpm
nss-tools-3.36.0-9.el6_10.s390x.rpm

x86_64:
nss-3.36.0-9.el6_10.i686.rpm
nss-3.36.0-9.el6_10.x86_64.rpm
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-devel-3.36.0-9.el6_10.i686.rpm
nss-devel-3.36.0-9.el6_10.x86_64.rpm
nss-sysinit-3.36.0-9.el6_10.x86_64.rpm
nss-tools-3.36.0-9.el6_10.x86_64.rpm

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

i386:
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.i686.rpm

ppc64:
nss-debuginfo-3.36.0-9.el6_10.ppc.rpm
nss-debuginfo-3.36.0-9.el6_10.ppc64.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.ppc.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.ppc64.rpm

s390x:
nss-debuginfo-3.36.0-9.el6_10.s390.rpm
nss-debuginfo-3.36.0-9.el6_10.s390x.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.s390.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.s390x.rpm

x86_64:
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.i686.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
nss-3.36.0-9.el6_10.src.rpm

i386:
nss-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-devel-3.36.0-9.el6_10.i686.rpm
nss-sysinit-3.36.0-9.el6_10.i686.rpm
nss-tools-3.36.0-9.el6_10.i686.rpm

x86_64:
nss-3.36.0-9.el6_10.i686.rpm
nss-3.36.0-9.el6_10.x86_64.rpm
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-devel-3.36.0-9.el6_10.i686.rpm
nss-devel-3.36.0-9.el6_10.x86_64.rpm
nss-sysinit-3.36.0-9.el6_10.x86_64.rpm
nss-tools-3.36.0-9.el6_10.x86_64.rpm

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

i386:
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.i686.rpm

x86_64:
nss-debuginfo-3.36.0-9.el6_10.i686.rpm
nss-debuginfo-3.36.0-9.el6_10.x86_64.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.i686.rpm
nss-pkcs11-devel-3.36.0-9.el6_10.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-2018-12384
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2018 Red Hat, Inc.
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