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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos Null Pointer Dereference in KDC PKINIT Code Lets Remote Users Deny Service
SecurityTracker Alert ID:  1028309
SecurityTracker URL:  http://securitytracker.com/id/1028309
CVE Reference:   CVE-2012-1016   (Links to External Site)
Date:  Mar 18 2013
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 5-1.10.4
Description:   A vulnerability was reported in MIT Kerberos. A remote user can cause denial of service conditions.

A remote user can send a specially crafted Draft 9 request to trigger a null pointer dereference in the pkinit_server_return_padata() function in plugins/preauth/pkinit/pkinit_srv.c and cause the target Kerberos server to crash.

Impact:   A remote user can cause the target Kerberos service to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2013-0656.html

Vendor URL:  web.mit.edu/kerberos/www/krb5-1.10/ (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.
Mar 18 2013 Kerberos Null Pointer Dereference in KDC PKINIT Code Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2013:0656-01] Moderate: krb5 security update

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

Synopsis:          Moderate: krb5 security update
Advisory ID:       RHSA-2013:0656-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0656.html
Issue date:        2013-03-18
CVE Names:         CVE-2012-1016 CVE-2013-1415 
=====================================================================

1. Summary:

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

The Red Hat Security Response Team 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 network authentication system which allows clients and
servers to authenticate to each other using symmetric encryption and a
trusted third-party, the Key Distribution Center (KDC).

When a client attempts to use PKINIT to obtain credentials from the KDC,
the client can specify, using an issuer and serial number, which of the
KDC's possibly-many certificates the client has in its possession, as a
hint to the KDC that it should use the corresponding key to sign its
response. If that specification was malformed, the KDC could attempt to
dereference a NULL pointer and crash. (CVE-2013-1415)

When a client attempts to use PKINIT to obtain credentials from the KDC,
the client will typically format its request to conform to the
specification published in RFC 4556. For interoperability reasons, clients
and servers also provide support for an older, draft version of that
specification. If a client formatted its request to conform to this older
version of the specification, with a non-default key agreement option, it
could cause the KDC to attempt to dereference a NULL pointer and crash.
(CVE-2012-1016)

All krb5 users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the updated
packages, the krb5kdc daemon will be restarted automatically.

4. Solution:

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

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

914749 - CVE-2013-1415 krb5: PKINIT null pointer deref leads to DoS  (pkinit_check_kdc_pkid())
917840 - CVE-2012-1016 krb5: PKINIT null pointer deref leads to DoS

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.10.3-10.el6_4.1.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-libs-1.10.3-10.el6_4.1.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.i686.rpm
krb5-workstation-1.10.3-10.el6_4.1.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.1.i686.rpm
krb5-libs-1.10.3-10.el6_4.1.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.10.3-10.el6_4.1.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-devel-1.10.3-10.el6_4.1.i686.rpm
krb5-server-1.10.3-10.el6_4.1.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.1.i686.rpm
krb5-devel-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.10.3-10.el6_4.1.src.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.1.i686.rpm
krb5-libs-1.10.3-10.el6_4.1.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.10.3-10.el6_4.1.src.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.1.i686.rpm
krb5-devel-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/krb5-1.10.3-10.el6_4.1.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-devel-1.10.3-10.el6_4.1.i686.rpm
krb5-libs-1.10.3-10.el6_4.1.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.i686.rpm
krb5-server-1.10.3-10.el6_4.1.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.i686.rpm
krb5-workstation-1.10.3-10.el6_4.1.i686.rpm

ppc64:
krb5-debuginfo-1.10.3-10.el6_4.1.ppc.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.ppc64.rpm
krb5-devel-1.10.3-10.el6_4.1.ppc.rpm
krb5-devel-1.10.3-10.el6_4.1.ppc64.rpm
krb5-libs-1.10.3-10.el6_4.1.ppc.rpm
krb5-libs-1.10.3-10.el6_4.1.ppc64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.ppc64.rpm
krb5-server-1.10.3-10.el6_4.1.ppc64.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.ppc.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.ppc64.rpm
krb5-workstation-1.10.3-10.el6_4.1.ppc64.rpm

s390x:
krb5-debuginfo-1.10.3-10.el6_4.1.s390.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.s390x.rpm
krb5-devel-1.10.3-10.el6_4.1.s390.rpm
krb5-devel-1.10.3-10.el6_4.1.s390x.rpm
krb5-libs-1.10.3-10.el6_4.1.s390.rpm
krb5-libs-1.10.3-10.el6_4.1.s390x.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.s390x.rpm
krb5-server-1.10.3-10.el6_4.1.s390x.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.s390.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.s390x.rpm
krb5-workstation-1.10.3-10.el6_4.1.s390x.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.1.i686.rpm
krb5-devel-1.10.3-10.el6_4.1.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.1.i686.rpm
krb5-libs-1.10.3-10.el6_4.1.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/krb5-1.10.3-10.el6_4.1.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-devel-1.10.3-10.el6_4.1.i686.rpm
krb5-libs-1.10.3-10.el6_4.1.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.i686.rpm
krb5-server-1.10.3-10.el6_4.1.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.i686.rpm
krb5-workstation-1.10.3-10.el6_4.1.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.1.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.1.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.1.i686.rpm
krb5-devel-1.10.3-10.el6_4.1.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.1.i686.rpm
krb5-libs-1.10.3-10.el6_4.1.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-1.10.3-10.el6_4.1.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.1.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.1.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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-1016.html
https://www.redhat.com/security/data/cve/CVE-2013-1415.html
https://access.redhat.com/security/updates/classification/#moderate
http://tools.ietf.org/html/rfc4556

8. Contact:

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

Copyright 2013 Red Hat, Inc.
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