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Category:   Application (Security)  >   Network Security Services (NSS) Vendors:   Mozilla.org
(Red Hat Issues Fix) Network Security Services Library Heap Overflow in Regular Expression Parser Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1022638
SecurityTracker URL:  http://securitytracker.com/id/1022638
CVE Reference:   CVE-2009-2404   (Links to External Site)
Date:  Jul 31 2009
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.12.3
Description:   A vulnerability was reported in Network Security Services (NSS). A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted certificate that, when processed by the target library's regular expression parser, will trigger a heap overflow and execute arbitrary code on the target system. The code will run with the privileges of the target application.

The flaw is triggered automatically when the certificate is issued by a previously trusted (Certificate Authority) CA. If the certificate is issued by an untrusted CA, the target user is presented with a dialog box before the flaw is triggered.

A demonstration exploit is described at:

http://www.blackhat.com/presentations/bh-usa-09/MARLINSPIKE/BHUSA09-Marlinspike-DefeatSSL-SLIDES.pdf

Moxie Marlinspike reported this vulnerability.
Impact:   A remote user can create a certificate that, when processed by the target application, will execute arbitrary code on the target system.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-1186.html
Vendor URL:  www.mozilla.org/projects/security/pki/nss/ (Links to External Site)
Cause:   Boundary 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 Heap Overflow in Regular Expression Parser Lets Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Thu, 30 Jul 2009 18:21:05 -0400
Subject:  [RHSA-2009:1186-01] Critical: nspr and nss security, bug fix,


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Critical: nspr and nss security, bug fix, and enhancement update
Advisory ID:       RHSA-2009:1186-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1186.html
Issue date:        2009-07-30
CVE Names:         CVE-2009-2404 CVE-2009-2408 CVE-2009-2409 
=====================================================================

1. Summary:

Updated nspr and nss packages that fix security issues, bugs, and add an
enhancement are now available for Red Hat Enterprise Linux 5.

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

The packages with this update are identical to the packages released by
RHBA-2009:1161 on the 20th of July 2009. They are being reissued as a Red
Hat Security Advisory as they fixed a number of security issues that were
made public today. If you are installing these packages for the first time,
they also provide a number of bug fixes and add an enhancement, as detailed
in RHBA-2009:1161. Since the packages are identical, there is no need to
install this update if RHBA-2009:1161 has already been installed.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, 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)

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

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/):

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 Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/nspr-4.7.4-1.el5_3.1.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/nss-3.12.3.99.3-1.el5_3.2.src.rpm

i386:
nspr-4.7.4-1.el5_3.1.i386.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.i386.rpm
nss-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-tools-3.12.3.99.3-1.el5_3.2.i386.rpm

x86_64:
nspr-4.7.4-1.el5_3.1.i386.rpm
nspr-4.7.4-1.el5_3.1.x86_64.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.i386.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.x86_64.rpm
nss-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-tools-3.12.3.99.3-1.el5_3.2.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/nspr-4.7.4-1.el5_3.1.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/nss-3.12.3.99.3-1.el5_3.2.src.rpm

i386:
nspr-debuginfo-4.7.4-1.el5_3.1.i386.rpm
nspr-devel-4.7.4-1.el5_3.1.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.i386.rpm

x86_64:
nspr-debuginfo-4.7.4-1.el5_3.1.i386.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.x86_64.rpm
nspr-devel-4.7.4-1.el5_3.1.i386.rpm
nspr-devel-4.7.4-1.el5_3.1.x86_64.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/nspr-4.7.4-1.el5_3.1.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/nss-3.12.3.99.3-1.el5_3.2.src.rpm

i386:
nspr-4.7.4-1.el5_3.1.i386.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.i386.rpm
nspr-devel-4.7.4-1.el5_3.1.i386.rpm
nss-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-tools-3.12.3.99.3-1.el5_3.2.i386.rpm

ia64:
nspr-4.7.4-1.el5_3.1.i386.rpm
nspr-4.7.4-1.el5_3.1.ia64.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.i386.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.ia64.rpm
nspr-devel-4.7.4-1.el5_3.1.ia64.rpm
nss-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-3.12.3.99.3-1.el5_3.2.ia64.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.ia64.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.ia64.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.ia64.rpm
nss-tools-3.12.3.99.3-1.el5_3.2.ia64.rpm

ppc:
nspr-4.7.4-1.el5_3.1.ppc.rpm
nspr-4.7.4-1.el5_3.1.ppc64.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.ppc.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.ppc64.rpm
nspr-devel-4.7.4-1.el5_3.1.ppc.rpm
nspr-devel-4.7.4-1.el5_3.1.ppc64.rpm
nss-3.12.3.99.3-1.el5_3.2.ppc.rpm
nss-3.12.3.99.3-1.el5_3.2.ppc64.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.ppc.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.ppc64.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.ppc.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.ppc64.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.ppc.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.ppc64.rpm
nss-tools-3.12.3.99.3-1.el5_3.2.ppc.rpm

s390x:
nspr-4.7.4-1.el5_3.1.s390.rpm
nspr-4.7.4-1.el5_3.1.s390x.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.s390.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.s390x.rpm
nspr-devel-4.7.4-1.el5_3.1.s390.rpm
nspr-devel-4.7.4-1.el5_3.1.s390x.rpm
nss-3.12.3.99.3-1.el5_3.2.s390.rpm
nss-3.12.3.99.3-1.el5_3.2.s390x.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.s390.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.s390x.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.s390.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.s390x.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.s390.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.s390x.rpm
nss-tools-3.12.3.99.3-1.el5_3.2.s390x.rpm

x86_64:
nspr-4.7.4-1.el5_3.1.i386.rpm
nspr-4.7.4-1.el5_3.1.x86_64.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.i386.rpm
nspr-debuginfo-4.7.4-1.el5_3.1.x86_64.rpm
nspr-devel-4.7.4-1.el5_3.1.i386.rpm
nspr-devel-4.7.4-1.el5_3.1.x86_64.rpm
nss-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-debuginfo-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-devel-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.i386.rpm
nss-pkcs11-devel-3.12.3.99.3-1.el5_3.2.x86_64.rpm
nss-tools-3.12.3.99.3-1.el5_3.2.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
http://rhn.redhat.com/errata/RHBA-2009-1161.html

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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