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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1032054
SecurityTracker URL:  http://securitytracker.com/id/1032054
CVE Reference:   CVE-2014-5353   (Links to External Site)
Date:  Apr 9 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   Two vulnerabilities were reported in MIT Kerberos. A remote authenticated user can cause denial of service conditions.

A remote authenticated user with privileges to set password policy and add or modify principals can attempt to use a named ticket policy object as a password policy for a principal to trigger a null pointer dereference in krb5_ldap_get_password_policy_from_dn() and cause the target system to crash [CVE-2014-5353].

Systems with kadmind configured to use LDAP for the KDC database are affected.

Patrik Kis reported this vulnerability.

A remote authenticated user can insert a principal entry that contains no long-term keys into the database to trigger a null pointer dereference in krb5_add_ber_mem_ldap_mod() and cause the target system to crash [CVE-2014-5354]. Versions prior to 1.12 are not affected.

Impact:   A remote authenticated user can cause the target system to crash.
Solution:   Red Hat has issued a fix for CVE-2014-5353.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-0794.html

Vendor URL:  web.mit.edu/kerberos/ (Links to External Site)
Cause:   Access control 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.
Dec 16 2014 MIT Kerberos Null Pointer Dereference Bugs Let Remote Authenticated Users Deny Service



 Source Message Contents

Subject:  [RHSA-2015:0794-01] Moderate: krb5 security update

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

Synopsis:          Moderate: krb5 security update
Advisory ID:       RHSA-2015:0794-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-0794.html
Issue date:        2015-04-09
CVE Names:         CVE-2014-5352 CVE-2014-5353 CVE-2014-5355 
                   CVE-2014-9421 CVE-2014-9422 
=====================================================================

1. Summary:

Updated krb5 packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links 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 Workstation (v. 6) - i386, x86_64

3. Description:

Kerberos is a networked authentication system which allows clients and
servers to authenticate to each other with the help of a trusted third
party, the Kerberos KDC.

The following security issues are fixed with this release:

A use-after-free flaw was found in the way the MIT Kerberos libgssapi_krb5
library processed valid context deletion tokens. An attacker able to make
an application using the GSS-API library (libgssapi) could call the
gss_process_context_token() function and use this flaw to crash that
application. (CVE-2014-5352)

If kadmind were used with an LDAP back end for the KDC database, a remote,
authenticated attacker who has the permissions to set the password policy
could crash kadmind by attempting to use a named ticket policy object as a
password policy for a principal. (CVE-2014-5353)

It was found that the krb5_read_message() function of MIT Kerberos did not
correctly sanitize input, and could create invalid krb5_data objects.
A remote, unauthenticated attacker could use this flaw to crash a Kerberos
child process via a specially crafted request. (CVE-2014-5355)

A double-free flaw was found in the way MIT Kerberos handled invalid
External Data Representation (XDR) data. An authenticated user could use
this flaw to crash the MIT Kerberos administration server (kadmind), or
other applications using Kerberos libraries, via specially crafted XDR
packets. (CVE-2014-9421)

It was found that the MIT Kerberos administration server (kadmind)
incorrectly accepted certain authentication requests for two-component
server principal names. A remote attacker able to acquire a key with a
particularly named principal (such as "kad/x") could use this flaw to
impersonate any user to kadmind, and perform administrative actions as that
user. (CVE-2014-9422)

Red Hat would like to thank the MIT Kerberos project for reporting
CVE-2014-5352, CVE-2014-9421, and CVE-2014-9422. The MIT Kerberos project
acknowledges Nico Williams for assisting with the analysis of
CVE-2014-5352.

All krb5 users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

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/):

1174543 - CVE-2014-5353 krb5: NULL pointer dereference when using a ticket policy name as a password policy name
1179856 - CVE-2014-5352 krb5: gss_process_context_token() incorrectly frees context (MITKRB5-SA-2015-001)
1179857 - CVE-2014-9421 krb5: kadmind doubly frees partial deserialization results (MITKRB5-SA-2015-001)
1179861 - CVE-2014-9422 krb5: kadmind incorrectly validates server principal name (MITKRB5-SA-2015-001)
1193939 - CVE-2014-5355 krb5: unauthenticated denial of service in recvauth_common() and others

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
krb5-1.10.3-37.el6_6.src.rpm

i386:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-libs-1.10.3-37.el6_6.i686.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.i686.rpm
krb5-workstation-1.10.3-37.el6_6.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm
krb5-libs-1.10.3-37.el6_6.i686.rpm
krb5-libs-1.10.3-37.el6_6.x86_64.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.x86_64.rpm
krb5-workstation-1.10.3-37.el6_6.x86_64.rpm

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

i386:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-devel-1.10.3-37.el6_6.i686.rpm
krb5-server-1.10.3-37.el6_6.i686.rpm
krb5-server-ldap-1.10.3-37.el6_6.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm
krb5-devel-1.10.3-37.el6_6.i686.rpm
krb5-devel-1.10.3-37.el6_6.x86_64.rpm
krb5-server-1.10.3-37.el6_6.x86_64.rpm
krb5-server-ldap-1.10.3-37.el6_6.i686.rpm
krb5-server-ldap-1.10.3-37.el6_6.x86_64.rpm

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

Source:
krb5-1.10.3-37.el6_6.src.rpm

x86_64:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm
krb5-libs-1.10.3-37.el6_6.i686.rpm
krb5-libs-1.10.3-37.el6_6.x86_64.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.x86_64.rpm
krb5-workstation-1.10.3-37.el6_6.x86_64.rpm

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

x86_64:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm
krb5-devel-1.10.3-37.el6_6.i686.rpm
krb5-devel-1.10.3-37.el6_6.x86_64.rpm
krb5-server-1.10.3-37.el6_6.x86_64.rpm
krb5-server-ldap-1.10.3-37.el6_6.i686.rpm
krb5-server-ldap-1.10.3-37.el6_6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
krb5-1.10.3-37.el6_6.src.rpm

i386:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-devel-1.10.3-37.el6_6.i686.rpm
krb5-libs-1.10.3-37.el6_6.i686.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.i686.rpm
krb5-server-1.10.3-37.el6_6.i686.rpm
krb5-server-ldap-1.10.3-37.el6_6.i686.rpm
krb5-workstation-1.10.3-37.el6_6.i686.rpm

ppc64:
krb5-debuginfo-1.10.3-37.el6_6.ppc.rpm
krb5-debuginfo-1.10.3-37.el6_6.ppc64.rpm
krb5-devel-1.10.3-37.el6_6.ppc.rpm
krb5-devel-1.10.3-37.el6_6.ppc64.rpm
krb5-libs-1.10.3-37.el6_6.ppc.rpm
krb5-libs-1.10.3-37.el6_6.ppc64.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.ppc64.rpm
krb5-server-1.10.3-37.el6_6.ppc64.rpm
krb5-server-ldap-1.10.3-37.el6_6.ppc.rpm
krb5-server-ldap-1.10.3-37.el6_6.ppc64.rpm
krb5-workstation-1.10.3-37.el6_6.ppc64.rpm

s390x:
krb5-debuginfo-1.10.3-37.el6_6.s390.rpm
krb5-debuginfo-1.10.3-37.el6_6.s390x.rpm
krb5-devel-1.10.3-37.el6_6.s390.rpm
krb5-devel-1.10.3-37.el6_6.s390x.rpm
krb5-libs-1.10.3-37.el6_6.s390.rpm
krb5-libs-1.10.3-37.el6_6.s390x.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.s390x.rpm
krb5-server-1.10.3-37.el6_6.s390x.rpm
krb5-server-ldap-1.10.3-37.el6_6.s390.rpm
krb5-server-ldap-1.10.3-37.el6_6.s390x.rpm
krb5-workstation-1.10.3-37.el6_6.s390x.rpm

x86_64:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm
krb5-devel-1.10.3-37.el6_6.i686.rpm
krb5-devel-1.10.3-37.el6_6.x86_64.rpm
krb5-libs-1.10.3-37.el6_6.i686.rpm
krb5-libs-1.10.3-37.el6_6.x86_64.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.x86_64.rpm
krb5-server-1.10.3-37.el6_6.x86_64.rpm
krb5-server-ldap-1.10.3-37.el6_6.i686.rpm
krb5-server-ldap-1.10.3-37.el6_6.x86_64.rpm
krb5-workstation-1.10.3-37.el6_6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
krb5-1.10.3-37.el6_6.src.rpm

i386:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-devel-1.10.3-37.el6_6.i686.rpm
krb5-libs-1.10.3-37.el6_6.i686.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.i686.rpm
krb5-server-1.10.3-37.el6_6.i686.rpm
krb5-server-ldap-1.10.3-37.el6_6.i686.rpm
krb5-workstation-1.10.3-37.el6_6.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-37.el6_6.i686.rpm
krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm
krb5-devel-1.10.3-37.el6_6.i686.rpm
krb5-devel-1.10.3-37.el6_6.x86_64.rpm
krb5-libs-1.10.3-37.el6_6.i686.rpm
krb5-libs-1.10.3-37.el6_6.x86_64.rpm
krb5-pkinit-openssl-1.10.3-37.el6_6.x86_64.rpm
krb5-server-1.10.3-37.el6_6.x86_64.rpm
krb5-server-ldap-1.10.3-37.el6_6.i686.rpm
krb5-server-ldap-1.10.3-37.el6_6.x86_64.rpm
krb5-workstation-1.10.3-37.el6_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://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2014-5352
https://access.redhat.com/security/cve/CVE-2014-5353
https://access.redhat.com/security/cve/CVE-2014-5355
https://access.redhat.com/security/cve/CVE-2014-9421
https://access.redhat.com/security/cve/CVE-2014-9422
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 2015 Red Hat, Inc.
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