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Red Hat Security Advisory 2016-0532-01

Red Hat Security Advisory 2016-0532-01
Posted Apr 4, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0532-01 - Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center. Security Fix: A memory leak flaw was found in the krb5_unparse_name() function of the MIT Kerberos kadmind service. An authenticated attacker could repeatedly send specially crafted requests to the server, which could cause the server to consume large amounts of memory resources, ultimately leading to a denial of service due to memory exhaustion.

tags | advisory, denial of service, memory leak
systems | linux, redhat
advisories | CVE-2015-8629, CVE-2015-8630, CVE-2015-8631
SHA-256 | 7923c4a26bd8eaff6297576d2f1e25328457dfe3d9715a4441a96cf23a30904c

Red Hat Security Advisory 2016-0532-01

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

Synopsis: Moderate: krb5 security update
Advisory ID: RHSA-2016:0532-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0532.html
Issue date: 2016-03-31
CVE Names: CVE-2015-8629 CVE-2015-8630 CVE-2015-8631
=====================================================================

1. Summary:

An update for krb5 is now available for Red Hat Enterprise Linux 7.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

Kerberos is a network authentication system, which can improve the security
of your network by eliminating the insecure practice of sending passwords
over the network in unencrypted form. It allows clients and servers to
authenticate to each other with the help of a trusted third party, the
Kerberos key distribution center (KDC).

Security Fix(es):

* A memory leak flaw was found in the krb5_unparse_name() function of the
MIT Kerberos kadmind service. An authenticated attacker could repeatedly
send specially crafted requests to the server, which could cause the server
to consume large amounts of memory resources, ultimately leading to a
denial of service due to memory exhaustion. (CVE-2015-8631)

* An out-of-bounds read flaw was found in the kadmind service of MIT
Kerberos. An authenticated attacker could send a maliciously crafted
message to force kadmind to read beyond the end of allocated memory, and
write the memory contents to the KDC database if the attacker has write
permission, leading to information disclosure. (CVE-2015-8629)

* A NULL pointer dereference flaw was found in the procedure used by the
MIT Kerberos kadmind service to store policies: the
kadm5_create_principal_3() and kadm5_modify_principal() function did not
ensure that a policy was given when KADM5_POLICY was set. An authenticated
attacker with permissions to modify the database could use this flaw to add
or modify a principal with a policy set to NULL, causing the kadmind
service to crash. (CVE-2015-8630)

The CVE-2015-8631 issue was discovered by Simo Sorce of Red Hat.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

After installing the updated packages, running Kerberos services (krb5kdc,
kadmin, and kprop) will be restarted automatically.

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

1302617 - CVE-2015-8629 krb5: xdr_nullstring() doesn't check for terminating null character
1302632 - CVE-2015-8630 krb5: krb5 doesn't check for null policy when KADM5_POLICY is set in the mask
1302642 - CVE-2015-8631 krb5: Memory leak caused by supplying a null principal name in request

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
krb5-1.13.2-12.el7_2.src.rpm

x86_64:
krb5-debuginfo-1.13.2-12.el7_2.i686.rpm
krb5-debuginfo-1.13.2-12.el7_2.x86_64.rpm
krb5-libs-1.13.2-12.el7_2.i686.rpm
krb5-libs-1.13.2-12.el7_2.x86_64.rpm
krb5-pkinit-1.13.2-12.el7_2.x86_64.rpm
krb5-workstation-1.13.2-12.el7_2.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
krb5-debuginfo-1.13.2-12.el7_2.i686.rpm
krb5-debuginfo-1.13.2-12.el7_2.x86_64.rpm
krb5-devel-1.13.2-12.el7_2.i686.rpm
krb5-devel-1.13.2-12.el7_2.x86_64.rpm
krb5-server-1.13.2-12.el7_2.x86_64.rpm
krb5-server-ldap-1.13.2-12.el7_2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
krb5-1.13.2-12.el7_2.src.rpm

x86_64:
krb5-debuginfo-1.13.2-12.el7_2.i686.rpm
krb5-debuginfo-1.13.2-12.el7_2.x86_64.rpm
krb5-libs-1.13.2-12.el7_2.i686.rpm
krb5-libs-1.13.2-12.el7_2.x86_64.rpm
krb5-pkinit-1.13.2-12.el7_2.x86_64.rpm
krb5-workstation-1.13.2-12.el7_2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
krb5-debuginfo-1.13.2-12.el7_2.i686.rpm
krb5-debuginfo-1.13.2-12.el7_2.x86_64.rpm
krb5-devel-1.13.2-12.el7_2.i686.rpm
krb5-devel-1.13.2-12.el7_2.x86_64.rpm
krb5-server-1.13.2-12.el7_2.x86_64.rpm
krb5-server-ldap-1.13.2-12.el7_2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
krb5-1.13.2-12.el7_2.src.rpm

ppc64:
krb5-debuginfo-1.13.2-12.el7_2.ppc.rpm
krb5-debuginfo-1.13.2-12.el7_2.ppc64.rpm
krb5-devel-1.13.2-12.el7_2.ppc.rpm
krb5-devel-1.13.2-12.el7_2.ppc64.rpm
krb5-libs-1.13.2-12.el7_2.ppc.rpm
krb5-libs-1.13.2-12.el7_2.ppc64.rpm
krb5-pkinit-1.13.2-12.el7_2.ppc64.rpm
krb5-server-1.13.2-12.el7_2.ppc64.rpm
krb5-server-ldap-1.13.2-12.el7_2.ppc64.rpm
krb5-workstation-1.13.2-12.el7_2.ppc64.rpm

ppc64le:
krb5-debuginfo-1.13.2-12.el7_2.ppc64le.rpm
krb5-devel-1.13.2-12.el7_2.ppc64le.rpm
krb5-libs-1.13.2-12.el7_2.ppc64le.rpm
krb5-pkinit-1.13.2-12.el7_2.ppc64le.rpm
krb5-server-1.13.2-12.el7_2.ppc64le.rpm
krb5-server-ldap-1.13.2-12.el7_2.ppc64le.rpm
krb5-workstation-1.13.2-12.el7_2.ppc64le.rpm

s390x:
krb5-debuginfo-1.13.2-12.el7_2.s390.rpm
krb5-debuginfo-1.13.2-12.el7_2.s390x.rpm
krb5-devel-1.13.2-12.el7_2.s390.rpm
krb5-devel-1.13.2-12.el7_2.s390x.rpm
krb5-libs-1.13.2-12.el7_2.s390.rpm
krb5-libs-1.13.2-12.el7_2.s390x.rpm
krb5-pkinit-1.13.2-12.el7_2.s390x.rpm
krb5-server-1.13.2-12.el7_2.s390x.rpm
krb5-server-ldap-1.13.2-12.el7_2.s390x.rpm
krb5-workstation-1.13.2-12.el7_2.s390x.rpm

x86_64:
krb5-debuginfo-1.13.2-12.el7_2.i686.rpm
krb5-debuginfo-1.13.2-12.el7_2.x86_64.rpm
krb5-devel-1.13.2-12.el7_2.i686.rpm
krb5-devel-1.13.2-12.el7_2.x86_64.rpm
krb5-libs-1.13.2-12.el7_2.i686.rpm
krb5-libs-1.13.2-12.el7_2.x86_64.rpm
krb5-pkinit-1.13.2-12.el7_2.x86_64.rpm
krb5-server-1.13.2-12.el7_2.x86_64.rpm
krb5-server-ldap-1.13.2-12.el7_2.x86_64.rpm
krb5-workstation-1.13.2-12.el7_2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
krb5-1.13.2-12.el7_2.src.rpm

x86_64:
krb5-debuginfo-1.13.2-12.el7_2.i686.rpm
krb5-debuginfo-1.13.2-12.el7_2.x86_64.rpm
krb5-devel-1.13.2-12.el7_2.i686.rpm
krb5-devel-1.13.2-12.el7_2.x86_64.rpm
krb5-libs-1.13.2-12.el7_2.i686.rpm
krb5-libs-1.13.2-12.el7_2.x86_64.rpm
krb5-pkinit-1.13.2-12.el7_2.x86_64.rpm
krb5-server-1.13.2-12.el7_2.x86_64.rpm
krb5-server-ldap-1.13.2-12.el7_2.x86_64.rpm
krb5-workstation-1.13.2-12.el7_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://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-8629
https://access.redhat.com/security/cve/CVE-2015-8630
https://access.redhat.com/security/cve/CVE-2015-8631
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 2016 Red Hat, Inc.
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