[RHSA-2015:2154-07] Moderate: krb5 security, bug fix, and enhancement update

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Red Hat Security Advisory

 

Synopsis: Moderate: krb5 security, bug fix, and enhancement update

Advisory ID: RHSA-2015:2154-07

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2154.html

Issue date: 2015-11-19

CVE Names: CVE-2014-5355 CVE-2015-2694

=====================================================================

 

1. Summary:

 

Updated krb5 packages that fix two security issues, several bugs, and add

various enhancements are now available for Red Hat Enterprise Linux 7.

 

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 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) - aarch64, 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).

 

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 flaw was found in the OTP kdcpreauth module of MIT kerberos.

An unauthenticated remote attacker could use this flaw to bypass the

requires_preauth flag on a client principal and obtain a ciphertext

encrypted in the principal's long-term key. This ciphertext could be used

to conduct an off-line dictionary attack against the user's password.

(CVE-2015-2694)

 

The krb5 packages have been upgraded to upstream version 1.13.2, which

provides a number of bug fixes and enhancements over the previous version.

(BZ#1203889)

 

Notably, this update fixes the following bugs:

 

* Previously, the RADIUS support (libkrad) in krb5 was sending krb5

authentication for Transmission Control Protocol (TCP) transports multiple

times, accidentally using a code path intended to be used only for

unreliable transport types, for example User Datagram Protocol (UDP)

transports. A patch that fixes the problem by disabling manual retries for

reliable transports, such as TCP, has been applied, and the correct code

path is now used in this situation. (BZ#1251586)

 

* Attempts to use Kerberos single sign-on (SSO) to access SAP NetWeaver

systems sometimes failed. The SAP NetWeaver developer trace displayed the

following error message:

 

No credentials were supplied, or the credentials were

unavailable or inaccessible

Unable to establish the security context

 

Querying SSO credential lifetime has been modified to trigger credential

acquisition, thus preventing the error from occurring. Now, the user can

successfully use Kerberos SSO for accessing SAP NetWeaver systems.

(BZ#1252454)

 

All krb5 users are advised to upgrade to these updated packages, which

correct these issues and add these enhancements.

 

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/):

 

1156144 - krb5 upstream test t_kdb.py failure

1163402 - kdb5_ldap_util view_policy does not shows ticket flags on s390x and ppc64

1164304 - Upstream unit tests loads the installed shared libraries instead the ones from the build

1185770 - Missing upstream test in krb5-1.12.2: src/tests/gssapi/t_invalid.c

1193939 - CVE-2014-5355 krb5: unauthenticated denial of service in recvauth_common() and others

1203889 - RFE: Rebase krb5 in RHEL7.2 to krb5 1.13 (krb1.13.2) ...

1216133 - CVE-2015-2694 krb5: issues in OTP and PKINIT kdcpreauth modules leading to requires_preauth bypass

1222903 - [sELinux] AVC denials may appear when kadmind starts

1247608 - [RFE] Add support for multi-hop preauth mechs via |KDC_ERR_MORE_PREAUTH_DATA_REQUIRED| for RFC 6113 ("A Generalized Framework for Kerberos Pre-Authentication")

1247751 - krb5-config returns wrong -specs path

1247761 - RFE: Minor krb5 spec file cleanup and sync with recent Fedora 22/23 changes

1250154 - [s390x, ppc64, ppc64le]: kadmind does not accept ACL if kadm5.acl does not end with EOL

1251586 - KDC sends multiple requests to ipa-otpd for the same authentication

1259846 - KDC does not return proper client principal for client referrals

 

6. Package List:

 

Red Hat Enterprise Linux Client (v. 7):

 

Source:

krb5-1.13.2-10.el7.src.rpm

 

x86_64:

krb5-debuginfo-1.13.2-10.el7.i686.rpm

krb5-debuginfo-1.13.2-10.el7.x86_64.rpm

krb5-libs-1.13.2-10.el7.i686.rpm

krb5-libs-1.13.2-10.el7.x86_64.rpm

krb5-pkinit-1.13.2-10.el7.x86_64.rpm

krb5-workstation-1.13.2-10.el7.x86_64.rpm

 

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

 

x86_64:

krb5-debuginfo-1.13.2-10.el7.i686.rpm

krb5-debuginfo-1.13.2-10.el7.x86_64.rpm

krb5-devel-1.13.2-10.el7.i686.rpm

krb5-devel-1.13.2-10.el7.x86_64.rpm

krb5-server-1.13.2-10.el7.x86_64.rpm

krb5-server-ldap-1.13.2-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode (v. 7):

 

Source:

krb5-1.13.2-10.el7.src.rpm

 

x86_64:

krb5-debuginfo-1.13.2-10.el7.i686.rpm

krb5-debuginfo-1.13.2-10.el7.x86_64.rpm

krb5-libs-1.13.2-10.el7.i686.rpm

krb5-libs-1.13.2-10.el7.x86_64.rpm

krb5-pkinit-1.13.2-10.el7.x86_64.rpm

krb5-workstation-1.13.2-10.el7.x86_64.rpm

 

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

 

x86_64:

krb5-debuginfo-1.13.2-10.el7.i686.rpm

krb5-debuginfo-1.13.2-10.el7.x86_64.rpm

krb5-devel-1.13.2-10.el7.i686.rpm

krb5-devel-1.13.2-10.el7.x86_64.rpm

krb5-server-1.13.2-10.el7.x86_64.rpm

krb5-server-ldap-1.13.2-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 7):

 

Source:

krb5-1.13.2-10.el7.src.rpm

 

aarch64:

krb5-debuginfo-1.13.2-10.el7.aarch64.rpm

krb5-devel-1.13.2-10.el7.aarch64.rpm

krb5-libs-1.13.2-10.el7.aarch64.rpm

krb5-pkinit-1.13.2-10.el7.aarch64.rpm

krb5-server-1.13.2-10.el7.aarch64.rpm

krb5-server-ldap-1.13.2-10.el7.aarch64.rpm

krb5-workstation-1.13.2-10.el7.aarch64.rpm

 

ppc64:

krb5-debuginfo-1.13.2-10.el7.ppc.rpm

krb5-debuginfo-1.13.2-10.el7.ppc64.rpm

krb5-devel-1.13.2-10.el7.ppc.rpm

krb5-devel-1.13.2-10.el7.ppc64.rpm

krb5-libs-1.13.2-10.el7.ppc.rpm

krb5-libs-1.13.2-10.el7.ppc64.rpm

krb5-pkinit-1.13.2-10.el7.ppc64.rpm

krb5-server-1.13.2-10.el7.ppc64.rpm

krb5-server-ldap-1.13.2-10.el7.ppc64.rpm

krb5-workstation-1.13.2-10.el7.ppc64.rpm

 

ppc64le:

krb5-debuginfo-1.13.2-10.el7.ppc64le.rpm

krb5-devel-1.13.2-10.el7.ppc64le.rpm

krb5-libs-1.13.2-10.el7.ppc64le.rpm

krb5-pkinit-1.13.2-10.el7.ppc64le.rpm

krb5-server-1.13.2-10.el7.ppc64le.rpm

krb5-server-ldap-1.13.2-10.el7.ppc64le.rpm

krb5-workstation-1.13.2-10.el7.ppc64le.rpm

 

s390x:

krb5-debuginfo-1.13.2-10.el7.s390.rpm

krb5-debuginfo-1.13.2-10.el7.s390x.rpm

krb5-devel-1.13.2-10.el7.s390.rpm

krb5-devel-1.13.2-10.el7.s390x.rpm

krb5-libs-1.13.2-10.el7.s390.rpm

krb5-libs-1.13.2-10.el7.s390x.rpm

krb5-pkinit-1.13.2-10.el7.s390x.rpm

krb5-server-1.13.2-10.el7.s390x.rpm

krb5-server-ldap-1.13.2-10.el7.s390x.rpm

krb5-workstation-1.13.2-10.el7.s390x.rpm

 

x86_64:

krb5-debuginfo-1.13.2-10.el7.i686.rpm

krb5-debuginfo-1.13.2-10.el7.x86_64.rpm

krb5-devel-1.13.2-10.el7.i686.rpm

krb5-devel-1.13.2-10.el7.x86_64.rpm

krb5-libs-1.13.2-10.el7.i686.rpm

krb5-libs-1.13.2-10.el7.x86_64.rpm

krb5-pkinit-1.13.2-10.el7.x86_64.rpm

krb5-server-1.13.2-10.el7.x86_64.rpm

krb5-server-ldap-1.13.2-10.el7.x86_64.rpm

krb5-workstation-1.13.2-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 7):

 

Source:

krb5-1.13.2-10.el7.src.rpm

 

x86_64:

krb5-debuginfo-1.13.2-10.el7.i686.rpm

krb5-debuginfo-1.13.2-10.el7.x86_64.rpm

krb5-devel-1.13.2-10.el7.i686.rpm

krb5-devel-1.13.2-10.el7.x86_64.rpm

krb5-libs-1.13.2-10.el7.i686.rpm

krb5-libs-1.13.2-10.el7.x86_64.rpm

krb5-pkinit-1.13.2-10.el7.x86_64.rpm

krb5-server-1.13.2-10.el7.x86_64.rpm

krb5-server-ldap-1.13.2-10.el7.x86_64.rpm

krb5-workstation-1.13.2-10.el7.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-2014-5355

https://access.redhat.com/security/cve/CVE-2015-2694

https://access.redhat.com/security/updates/classification/#moderate

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2015 Red Hat, Inc.

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