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Category:   Application (Security)  >   FreeRADIUS Vendors:   FreeRADIUS Server Project
(Red Hat Issues Fix) FreeRADIUS SHAA Stack Overflow Lets Remote Users Deny Service in Certain Cases
SecurityTracker Alert ID:  1033055
SecurityTracker URL:  http://securitytracker.com/id/1033055
CVE Reference:   CVE-2014-2015   (Links to External Site)
Date:  Jul 24 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in FreeRADIUS. A remote user can cause denial of service conditions in certain cases.

A remote user with an existing user account and that can specify a specially crafted hashed SHAA password value can trigger a stack overflow in the rlm_pap module and cause the target service to crash.

Pierre Carrier from Airbnb reported this vulnerability.

Impact:   A remote user with an existing user account and that can specify a specially crafted hashed SHAA password value can cause the target service to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1287.html

Vendor URL:  freeradius.org/ (Links to External Site)
Cause:   Boundary 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.
Feb 17 2014 FreeRADIUS SHAA Stack Overflow Lets Remote Users Deny Service in Certain Cases



 Source Message Contents

Subject:  [RHSA-2015:1287-01] Moderate: freeradius security, bug fix, and enhancement update

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

Synopsis:          Moderate: freeradius security, bug fix, and enhancement update
Advisory ID:       RHSA-2015:1287-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1287.html
Issue date:        2015-07-22
Updated on:        2015-01-27
CVE Names:         CVE-2014-2015 
=====================================================================

1. Summary:

Updated freeradius packages that fix one security issue, several bugs, and
add various enhancements are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

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:

FreeRADIUS is a high-performance and highly configurable free Remote
Authentication Dial In User Service (RADIUS) server, designed to allow
centralized authentication and authorization for a network.

A stack-based buffer overflow was found in the way the FreeRADIUS rlm_pap
module handled long password hashes. An attacker able to make radiusd
process a malformed password hash could cause the daemon to crash.
(CVE-2014-2015)

The freeradius packages have been upgraded to upstream version 2.2.6, which
provides a number of bug fixes and enhancements over the previous version,
including:

* The number of dictionaries have been updated.

* This update implements several Extensible Authentication Protocol
(EAP) improvements.

* A number of new expansions have been added, including: %{randstr:...},
%{hex:...}, %{sha1:...}, %{base64:...}, %{tobase64:...}, and
%{base64tohex:...}.

* Hexadecimal numbers (0x...) are now supported in %{expr:...} expansions.

* This update adds operator support to the rlm_python module.

* The Dynamic Host Configuration Protocol (DHCP) and DHCP relay code have
been finalized.

* This update adds the rlm_cache module to cache arbitrary attributes.

For a complete list of bug fixes and enhancements provided by this rebase,
see the freeradius changelog linked to in the References section.

(BZ#1078736)

This update also fixes the following bugs:

* The /var/log/radius/radutmp file was configured to rotate at one-month
intervals, even though this was unnecessary. This update removes
/var/log/radius/radutmp from the installed logrotate utility configuration
in the /etc/logrotate.d/radiusd file, and /var/log/radius/radutmp is no
longer rotated. (BZ#904578)

* The radiusd service could not write the output file created by the
raddebug utility. The raddebug utility now sets appropriate ownership to
the output file, allowing radiusd to write the output. (BZ#921563)

* After starting raddebug using the "raddebug -t 0" command, raddebug
exited immediately. A typo in the special case comparison has been fixed,
and raddebug now runs for 11.5 days in this situation. (BZ#921567)

* MS-CHAP authentication failed when the User-Name and MS-CHAP-User-Name
attributes used different encodings, even when the user provided correct
credentials. Now, MS-CHAP authentication properly handles mismatching
character encodings. Authentication with correct credentials no longer
fails in this situation. (BZ#1060319)

* Automatically generated default certificates used the SHA-1 algorithm
message digest, which is considered insecure. The default certificates now
use the more secure SHA-256 algorithm message digest. (BZ#1135439)

* During the Online Certificate Status Protocol (OCSP) validation, radiusd
terminated unexpectedly with a segmentation fault after attempting to
access the next update field that was not provided by the OCSP responder.
Now, radiusd does not crash in this situation and instead continues to
complete the OCSP validation. (BZ#1142669)

* Prior to this update, radiusd failed to work with some of the more recent
MikroTIK attributes, because the installed directory.mikrotik file did not
include them. This update adds MikroTIK attributes with IDs up to 22 to
dictionary.mikrotik, and radiusd now works as expected with these
attributes. (BZ#1173388)

Users of freeradius are advised to upgrade to these updated packages, which
correct these issues and add these enhancements. After installing this
update, the radiusd service will be restarted automatically.

4. Solution:

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

904578 - radutmp should not rotate
921563 - raddebug not working correctly
921567 - raddebug -t 0 exists immediately
1060319 - MSCHAP Authentication is not working using automatic windows user credentials.
1066761 - CVE-2014-2015 freeradius: stack-based buffer overflow flaw in rlm_pap module
1078736 - Rebase FreeRADIUS to 2.2.4
1135439 - Default message digest defaults to sha1
1142669 - EAP-TLS and OCSP validation causing segmentation fault + patch
1173388 - dictionary.mikrotik missing Attributes
1189011 - FreeRADIUS doesn't start after upgrade due to failing OpenSSL version check
1189386 - radiusd fails to start after 'clean' installation
1189394 - radiusd segfaults after update

6. Package List:

Red Hat Enterprise Linux Server (v. 6):

Source:
freeradius-2.2.6-4.el6.src.rpm

i386:
freeradius-2.2.6-4.el6.i686.rpm
freeradius-debuginfo-2.2.6-4.el6.i686.rpm

ppc64:
freeradius-2.2.6-4.el6.ppc64.rpm
freeradius-debuginfo-2.2.6-4.el6.ppc64.rpm

s390x:
freeradius-2.2.6-4.el6.s390x.rpm
freeradius-debuginfo-2.2.6-4.el6.s390x.rpm

x86_64:
freeradius-2.2.6-4.el6.x86_64.rpm
freeradius-debuginfo-2.2.6-4.el6.x86_64.rpm

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

i386:
freeradius-debuginfo-2.2.6-4.el6.i686.rpm
freeradius-krb5-2.2.6-4.el6.i686.rpm
freeradius-ldap-2.2.6-4.el6.i686.rpm
freeradius-mysql-2.2.6-4.el6.i686.rpm
freeradius-perl-2.2.6-4.el6.i686.rpm
freeradius-postgresql-2.2.6-4.el6.i686.rpm
freeradius-python-2.2.6-4.el6.i686.rpm
freeradius-unixODBC-2.2.6-4.el6.i686.rpm
freeradius-utils-2.2.6-4.el6.i686.rpm

ppc64:
freeradius-debuginfo-2.2.6-4.el6.ppc64.rpm
freeradius-krb5-2.2.6-4.el6.ppc64.rpm
freeradius-ldap-2.2.6-4.el6.ppc64.rpm
freeradius-mysql-2.2.6-4.el6.ppc64.rpm
freeradius-perl-2.2.6-4.el6.ppc64.rpm
freeradius-postgresql-2.2.6-4.el6.ppc64.rpm
freeradius-python-2.2.6-4.el6.ppc64.rpm
freeradius-unixODBC-2.2.6-4.el6.ppc64.rpm
freeradius-utils-2.2.6-4.el6.ppc64.rpm

s390x:
freeradius-debuginfo-2.2.6-4.el6.s390x.rpm
freeradius-krb5-2.2.6-4.el6.s390x.rpm
freeradius-ldap-2.2.6-4.el6.s390x.rpm
freeradius-mysql-2.2.6-4.el6.s390x.rpm
freeradius-perl-2.2.6-4.el6.s390x.rpm
freeradius-postgresql-2.2.6-4.el6.s390x.rpm
freeradius-python-2.2.6-4.el6.s390x.rpm
freeradius-unixODBC-2.2.6-4.el6.s390x.rpm
freeradius-utils-2.2.6-4.el6.s390x.rpm

x86_64:
freeradius-debuginfo-2.2.6-4.el6.x86_64.rpm
freeradius-krb5-2.2.6-4.el6.x86_64.rpm
freeradius-ldap-2.2.6-4.el6.x86_64.rpm
freeradius-mysql-2.2.6-4.el6.x86_64.rpm
freeradius-perl-2.2.6-4.el6.x86_64.rpm
freeradius-postgresql-2.2.6-4.el6.x86_64.rpm
freeradius-python-2.2.6-4.el6.x86_64.rpm
freeradius-unixODBC-2.2.6-4.el6.x86_64.rpm
freeradius-utils-2.2.6-4.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
freeradius-2.2.6-4.el6.src.rpm

i386:
freeradius-2.2.6-4.el6.i686.rpm
freeradius-debuginfo-2.2.6-4.el6.i686.rpm

x86_64:
freeradius-2.2.6-4.el6.x86_64.rpm
freeradius-debuginfo-2.2.6-4.el6.x86_64.rpm

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

i386:
freeradius-debuginfo-2.2.6-4.el6.i686.rpm
freeradius-krb5-2.2.6-4.el6.i686.rpm
freeradius-ldap-2.2.6-4.el6.i686.rpm
freeradius-mysql-2.2.6-4.el6.i686.rpm
freeradius-perl-2.2.6-4.el6.i686.rpm
freeradius-postgresql-2.2.6-4.el6.i686.rpm
freeradius-python-2.2.6-4.el6.i686.rpm
freeradius-unixODBC-2.2.6-4.el6.i686.rpm
freeradius-utils-2.2.6-4.el6.i686.rpm

x86_64:
freeradius-debuginfo-2.2.6-4.el6.x86_64.rpm
freeradius-krb5-2.2.6-4.el6.x86_64.rpm
freeradius-ldap-2.2.6-4.el6.x86_64.rpm
freeradius-mysql-2.2.6-4.el6.x86_64.rpm
freeradius-perl-2.2.6-4.el6.x86_64.rpm
freeradius-postgresql-2.2.6-4.el6.x86_64.rpm
freeradius-python-2.2.6-4.el6.x86_64.rpm
freeradius-unixODBC-2.2.6-4.el6.x86_64.rpm
freeradius-utils-2.2.6-4.el6.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-2014-2015
https://access.redhat.com/security/updates/classification/#moderate
https://raw.githubusercontent.com/FreeRADIUS/freeradius-server/v3.0.x/doc/ChangeLog

8. Contact:

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

Copyright 2015 Red Hat, Inc.
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