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Category:   Application (Security)  >   Network Security Services (NSS) Vendors:   Mozilla.org
(Red Hat Issues Fix) Network Security Services (NSS) SSL DHE/ECDHE Use-After-Free Memory Error May Let Remote Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1035675
SecurityTracker URL:  http://securitytracker.com/id/1035675
CVE Reference:   CVE-2016-1978   (Links to External Site)
Date:  Apr 25 2016
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Network Security Services (NSS). A remote user may be able to execute arbitrary code on the target system.

A remote user can send specially crafted DHE and ECDHE handshake data to trigger a user-after-free memory error when the target system's available memory is low and potentially execute arbitrary code on the target system.

Eric Rescorla reported this vulnerability vulnerability.

Impact:   A remote user may be able to execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-0684.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-0684.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Mar 14 2016 Network Security Services (NSS) SSL DHE/ECDHE Use-After-Free Memory Error May Let Remote Users Execute Arbitrary Code on the Target System



 Source Message Contents

Subject:  [RHSA-2016:0684-01] Moderate: nss and nspr security, bug fix, and enhancement update

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

Synopsis:          Moderate: nss and nspr security, bug fix, and enhancement update
Advisory ID:       RHSA-2016:0684-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0684.html
Issue date:        2016-04-25
CVE Names:         CVE-2016-1978 CVE-2016-1979 
=====================================================================

1. Summary:

An update for nss and nspr is now available for Red Hat Enterprise Linux 5.

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 (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop Workstation (v. 5 client) - 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. Netscape Portable Runtime (NSPR) provides platform
independence for non-GUI operating system facilities.

The following packages have been upgraded to a newer upstream version: nss
3.21.0, nspr 4.11.0. (BZ#1297944, BZ#1297943)

Security Fix(es):

* A use-after-free flaw was found in the way NSS handled DHE
(Diffie-Hellman key exchange) and ECDHE (Elliptic Curve Diffie-Hellman key
exchange) handshake messages. A remote attacker could send a specially
crafted handshake message that, when parsed by an application linked
against NSS, would cause that application to crash or, under certain
special conditions, execute arbitrary code using the permissions of the
user running the application. (CVE-2016-1978)

* A use-after-free flaw was found in the way NSS processed certain DER
(Distinguished Encoding Rules) encoded cryptographic keys. An attacker
could use this flaw to create a specially crafted DER encoded certificate
which, when parsed by an application compiled against the NSS library,
could cause that application to crash, or execute arbitrary code using the
permissions of the user running the application. (CVE-2016-1979)

Red Hat would like to thank the Mozilla project for reporting these issues.
Upstream acknowledges Eric Rescorla as the original reporter of
CVE-2016-1978; and Tim Taubert as the original reporter of CVE-2016-1979.

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 or NSPR (for example,
Firefox) must be restarted for this update to take effect.

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

1297943 - Rebase RHEL 5.11.z to NSPR 4.11 in preparation for Firefox 45.
1297944 - Rebase RHEL 5.11.z to NSS 3.21 in preparation for Firefox 45.
1315202 - CVE-2016-1979 nss: Use-after-free during processing of DER encoded keys in NSS (MFSA 2016-36)
1315565 - CVE-2016-1978 nss: Use-after-free in NSS during SSL connections in low memory (MFSA 2016-15)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
nspr-4.11.0-1.el5_11.src.rpm
nss-3.21.0-6.el5_11.src.rpm

i386:
nspr-4.11.0-1.el5_11.i386.rpm
nspr-debuginfo-4.11.0-1.el5_11.i386.rpm
nss-3.21.0-6.el5_11.i386.rpm
nss-debuginfo-3.21.0-6.el5_11.i386.rpm
nss-tools-3.21.0-6.el5_11.i386.rpm

x86_64:
nspr-4.11.0-1.el5_11.i386.rpm
nspr-4.11.0-1.el5_11.x86_64.rpm
nspr-debuginfo-4.11.0-1.el5_11.i386.rpm
nspr-debuginfo-4.11.0-1.el5_11.x86_64.rpm
nss-3.21.0-6.el5_11.i386.rpm
nss-3.21.0-6.el5_11.x86_64.rpm
nss-debuginfo-3.21.0-6.el5_11.i386.rpm
nss-debuginfo-3.21.0-6.el5_11.x86_64.rpm
nss-tools-3.21.0-6.el5_11.x86_64.rpm

Red Hat Enterprise Linux Desktop Workstation (v. 5 client):

Source:
nspr-4.11.0-1.el5_11.src.rpm
nss-3.21.0-6.el5_11.src.rpm

i386:
nspr-debuginfo-4.11.0-1.el5_11.i386.rpm
nspr-devel-4.11.0-1.el5_11.i386.rpm
nss-debuginfo-3.21.0-6.el5_11.i386.rpm
nss-devel-3.21.0-6.el5_11.i386.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.i386.rpm

x86_64:
nspr-debuginfo-4.11.0-1.el5_11.i386.rpm
nspr-debuginfo-4.11.0-1.el5_11.x86_64.rpm
nspr-devel-4.11.0-1.el5_11.i386.rpm
nspr-devel-4.11.0-1.el5_11.x86_64.rpm
nss-debuginfo-3.21.0-6.el5_11.i386.rpm
nss-debuginfo-3.21.0-6.el5_11.x86_64.rpm
nss-devel-3.21.0-6.el5_11.i386.rpm
nss-devel-3.21.0-6.el5_11.x86_64.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.i386.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
nspr-4.11.0-1.el5_11.src.rpm
nss-3.21.0-6.el5_11.src.rpm

i386:
nspr-4.11.0-1.el5_11.i386.rpm
nspr-debuginfo-4.11.0-1.el5_11.i386.rpm
nspr-devel-4.11.0-1.el5_11.i386.rpm
nss-3.21.0-6.el5_11.i386.rpm
nss-debuginfo-3.21.0-6.el5_11.i386.rpm
nss-devel-3.21.0-6.el5_11.i386.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.i386.rpm
nss-tools-3.21.0-6.el5_11.i386.rpm

ia64:
nspr-4.11.0-1.el5_11.i386.rpm
nspr-4.11.0-1.el5_11.ia64.rpm
nspr-debuginfo-4.11.0-1.el5_11.i386.rpm
nspr-debuginfo-4.11.0-1.el5_11.ia64.rpm
nspr-devel-4.11.0-1.el5_11.ia64.rpm
nss-3.21.0-6.el5_11.i386.rpm
nss-3.21.0-6.el5_11.ia64.rpm
nss-debuginfo-3.21.0-6.el5_11.i386.rpm
nss-debuginfo-3.21.0-6.el5_11.ia64.rpm
nss-devel-3.21.0-6.el5_11.ia64.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.ia64.rpm
nss-tools-3.21.0-6.el5_11.ia64.rpm

ppc:
nspr-4.11.0-1.el5_11.ppc.rpm
nspr-4.11.0-1.el5_11.ppc64.rpm
nspr-debuginfo-4.11.0-1.el5_11.ppc.rpm
nspr-debuginfo-4.11.0-1.el5_11.ppc64.rpm
nspr-devel-4.11.0-1.el5_11.ppc.rpm
nspr-devel-4.11.0-1.el5_11.ppc64.rpm
nss-3.21.0-6.el5_11.ppc.rpm
nss-3.21.0-6.el5_11.ppc64.rpm
nss-debuginfo-3.21.0-6.el5_11.ppc.rpm
nss-debuginfo-3.21.0-6.el5_11.ppc64.rpm
nss-devel-3.21.0-6.el5_11.ppc.rpm
nss-devel-3.21.0-6.el5_11.ppc64.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.ppc.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.ppc64.rpm
nss-tools-3.21.0-6.el5_11.ppc.rpm

s390x:
nspr-4.11.0-1.el5_11.s390.rpm
nspr-4.11.0-1.el5_11.s390x.rpm
nspr-debuginfo-4.11.0-1.el5_11.s390.rpm
nspr-debuginfo-4.11.0-1.el5_11.s390x.rpm
nspr-devel-4.11.0-1.el5_11.s390.rpm
nspr-devel-4.11.0-1.el5_11.s390x.rpm
nss-3.21.0-6.el5_11.s390.rpm
nss-3.21.0-6.el5_11.s390x.rpm
nss-debuginfo-3.21.0-6.el5_11.s390.rpm
nss-debuginfo-3.21.0-6.el5_11.s390x.rpm
nss-devel-3.21.0-6.el5_11.s390.rpm
nss-devel-3.21.0-6.el5_11.s390x.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.s390.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.s390x.rpm
nss-tools-3.21.0-6.el5_11.s390x.rpm

x86_64:
nspr-4.11.0-1.el5_11.i386.rpm
nspr-4.11.0-1.el5_11.x86_64.rpm
nspr-debuginfo-4.11.0-1.el5_11.i386.rpm
nspr-debuginfo-4.11.0-1.el5_11.x86_64.rpm
nspr-devel-4.11.0-1.el5_11.i386.rpm
nspr-devel-4.11.0-1.el5_11.x86_64.rpm
nss-3.21.0-6.el5_11.i386.rpm
nss-3.21.0-6.el5_11.x86_64.rpm
nss-debuginfo-3.21.0-6.el5_11.i386.rpm
nss-debuginfo-3.21.0-6.el5_11.x86_64.rpm
nss-devel-3.21.0-6.el5_11.i386.rpm
nss-devel-3.21.0-6.el5_11.x86_64.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.i386.rpm
nss-pkcs11-devel-3.21.0-6.el5_11.x86_64.rpm
nss-tools-3.21.0-6.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-2016-1978
https://access.redhat.com/security/cve/CVE-2016-1979
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 2016 Red Hat, Inc.
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