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Category:   Application (Security)  >   Network Security Services (NSS) Vendors:   Mozilla.org
(Red Hat Issues Fix) Network Security Services Library Supports Certificates With Weak MD2 Hash Signatures
SecurityTracker Alert ID:  1022645
SecurityTracker URL:  http://securitytracker.com/id/1022645
CVE Reference:   CVE-2009-2409   (Links to External Site)
Date:  Jul 31 2009
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.12.3
Description:   A vulnerability was reported in Network Security Services. A remote user may be create certificates that appear to be valid for arbitrary sites. OpenSSL, GnuTLS, Mozilla Firefox, and other applications are affected.

A remote user that is able to create a certificate that has the same MD2 hash signature as a trusted Certificate Authority root certificate can issue valid SSL certificates for arbitrary sites.

Dan Kaminsky reported this vulnerability.
Impact:   A remote user may be able to issue valid SSL certificates for arbitrary sites in certain cases.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-1190.html
Vendor URL:  www.mozilla.org/projects/security/pki/nss/ (Links to External Site)
Cause:   Authentication error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Jul 31 2009 Network Security Services Library Supports Certificates With Weak MD2 Hash Signatures


 Source Message Contents
Date:  Fri, 31 Jul 2009 10:31:41 -0400
Subject:  [RHSA-2009:1190-01] Critical: nspr and nss security and bug fix


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

Synopsis:          Critical: nspr and nss security and bug fix update
Advisory ID:       RHSA-2009:1190-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1190.html
Issue date:        2009-07-31
CVE Names:         CVE-2009-2404 CVE-2009-2408 CVE-2009-2409 
=====================================================================

1. Summary:

Updated nspr and nss packages that fix security issues and bugs are now
available for Red Hat Enterprise Linux 4.7 Extended Update Support.

This update has been rated as having critical security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4.7.z - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux ES version 4.7.z - i386, ia64, x86_64

3. Description:

Netscape Portable Runtime (NSPR) provides platform independence for non-GUI
operating system facilities. These facilities include threads, thread
synchronization, normal file and network I/O, interval timing, calendar
time, basic memory management (malloc and free), and shared library linking.

Network Security Services (NSS) is a set of libraries designed to support
the cross-platform development of security-enabled client and server
applications. Applications built with NSS can support SSLv2, SSLv3, TLS,
and other security standards.

These updated packages upgrade NSS from the previous version, 3.12.2, to a
prerelease of version 3.12.4. The version of NSPR has also been upgraded
from 4.7.3 to 4.7.4.

Moxie Marlinspike reported a heap overflow flaw in a regular expression
parser in the NSS library used by browsers such as Mozilla Firefox to match
common names in certificates. A malicious website could present a
carefully-crafted certificate in such a way as to trigger the heap
overflow, leading to a crash or, possibly, arbitrary code execution with
the permissions of the user running the browser. (CVE-2009-2404)

Note: in order to exploit this issue without further user interaction in
Firefox, the carefully-crafted certificate would need to be signed by a
Certificate Authority trusted by Firefox, otherwise Firefox presents the
victim with a warning that the certificate is untrusted. Only if the user
then accepts the certificate will the overflow take place.

Dan Kaminsky discovered flaws in the way browsers such as Firefox handle
NULL characters in a certificate. If an attacker is able to get a
carefully-crafted certificate signed by a Certificate Authority trusted by
Firefox, the attacker could use the certificate during a man-in-the-middle
attack and potentially confuse Firefox into accepting it by mistake.
(CVE-2009-2408)

Dan Kaminsky found that browsers still accept certificates with MD2 hash
signatures, even though MD2 is no longer considered a cryptographically
strong algorithm. This could make it easier for an attacker to create a
malicious certificate that would be treated as trusted by a browser. NSS
now disables the use of MD2 and MD4 algorithms inside signatures by
default. (CVE-2009-2409)

These version upgrades also provide fixes for the following bugs:

* SSL client authentication failed against an Apache server when it was 
using the mod_nss module and configured for NSSOCSP. On the client side,
the user agent received an error message that referenced "Error Code:
- -12271" and stated that establishing an encrypted connection had failed
because the certificate had been rejected by the host.

On the server side, the nss_error_log under /var/log/httpd/ contained the
following message:

[error] Re-negotiation handshake failed: Not accepted by client!?

Also, /var/log/httpd/error_log contained this error:

SSL Library Error: -8071 The OCSP server experienced an internal error

With these updated packages, the dependency problem which caused this
failure has been resolved so that SSL client authentication with an
Apache web server using mod_nss which is configured for NSSOCSP succeeds
as expected. Note that if the presented client certificate is expired,
then access is denied, the user agent is presented with an error message
about the invalid certificate, and the OCSP queries are seen in the OCSP
responder. Also, similar OCSP status verification happens for SSL server
certificates used in Apache upon instance start or restart. (BZ#508026)

* NSS uses a software integrity test to detect code corruption. RPM
transactions and system link optimization daemons (such as prelink) can
change the contents of libraries, causing the software integrity test to
fail. In combination with the updated prelink package (RHBA-2009:1041),
these updated packages can now prevent software integrity test failures.
(BZ#495938)

All users of nspr and nss are advised to upgrade to these updated packages,
which resolve these issues.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

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

495938 - seamonkey/nss FIPS mode failure, update prelink and nss
508026 - rhcs80beta TPS and mod_nss with NSSOCSP has ssl errors and unable to use agent service
510197 - CVE-2009-2409 deprecate MD2 in SSL cert validation (Kaminsky)
510251 - CVE-2009-2408 firefox/nss: doesn't handle NULL in Common Name properly
512912 - CVE-2009-2404 nss regexp heap overflow

6. Package List:

Red Hat Enterprise Linux AS version 4.7.z:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/nspr-4.7.4-1.el4_7.1.src.rpm
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/nss-3.12.3.99.3-1.el4_7.6.src.rpm

i386:
nspr-4.7.4-1.el4_7.1.i386.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.i386.rpm
nspr-devel-4.7.4-1.el4_7.1.i386.rpm
nss-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.i386.rpm

ia64:
nspr-4.7.4-1.el4_7.1.i386.rpm
nspr-4.7.4-1.el4_7.1.ia64.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.i386.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.ia64.rpm
nspr-devel-4.7.4-1.el4_7.1.ia64.rpm
nss-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-3.12.3.99.3-1.el4_7.6.ia64.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.ia64.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.ia64.rpm

ppc:
nspr-4.7.4-1.el4_7.1.ppc.rpm
nspr-4.7.4-1.el4_7.1.ppc64.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.ppc.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.ppc64.rpm
nspr-devel-4.7.4-1.el4_7.1.ppc.rpm
nss-3.12.3.99.3-1.el4_7.6.ppc.rpm
nss-3.12.3.99.3-1.el4_7.6.ppc64.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.ppc.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.ppc64.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.ppc.rpm

s390:
nspr-4.7.4-1.el4_7.1.s390.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.s390.rpm
nspr-devel-4.7.4-1.el4_7.1.s390.rpm
nss-3.12.3.99.3-1.el4_7.6.s390.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.s390.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.s390.rpm

s390x:
nspr-4.7.4-1.el4_7.1.s390.rpm
nspr-4.7.4-1.el4_7.1.s390x.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.s390.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.s390x.rpm
nspr-devel-4.7.4-1.el4_7.1.s390x.rpm
nss-3.12.3.99.3-1.el4_7.6.s390.rpm
nss-3.12.3.99.3-1.el4_7.6.s390x.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.s390.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.s390x.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.s390x.rpm

x86_64:
nspr-4.7.4-1.el4_7.1.i386.rpm
nspr-4.7.4-1.el4_7.1.x86_64.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.i386.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.x86_64.rpm
nspr-devel-4.7.4-1.el4_7.1.x86_64.rpm
nss-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-3.12.3.99.3-1.el4_7.6.x86_64.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.x86_64.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.x86_64.rpm

Red Hat Enterprise Linux ES version 4.7.z:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/nspr-4.7.4-1.el4_7.1.src.rpm
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/nss-3.12.3.99.3-1.el4_7.6.src.rpm

i386:
nspr-4.7.4-1.el4_7.1.i386.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.i386.rpm
nspr-devel-4.7.4-1.el4_7.1.i386.rpm
nss-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.i386.rpm

ia64:
nspr-4.7.4-1.el4_7.1.i386.rpm
nspr-4.7.4-1.el4_7.1.ia64.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.i386.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.ia64.rpm
nspr-devel-4.7.4-1.el4_7.1.ia64.rpm
nss-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-3.12.3.99.3-1.el4_7.6.ia64.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.ia64.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.ia64.rpm

x86_64:
nspr-4.7.4-1.el4_7.1.i386.rpm
nspr-4.7.4-1.el4_7.1.x86_64.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.i386.rpm
nspr-debuginfo-4.7.4-1.el4_7.1.x86_64.rpm
nspr-devel-4.7.4-1.el4_7.1.x86_64.rpm
nss-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-3.12.3.99.3-1.el4_7.6.x86_64.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el4_7.6.x86_64.rpm
nss-devel-3.12.3.99.3-1.el4_7.6.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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2404
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2408
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2409
http://www.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2009 Red Hat, Inc.
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