[RHSA-2015:0439-01] 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-2015:0439-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0439.html

Issue date: 2015-03-05

CVE Names: CVE-2014-4341 CVE-2014-4342 CVE-2014-4343

CVE-2014-4344 CVE-2014-4345 CVE-2014-5352

CVE-2014-5353 CVE-2014-9421 CVE-2014-9422

CVE-2014-9423

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

 

1. Summary:

 

Updated krb5 packages that fix multiple 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.

 

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.

 

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, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

 

3. Description:

 

A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO

acceptor for continuation tokens. A remote, unauthenticated attacker could

use this flaw to crash a GSSAPI-enabled server application. (CVE-2014-4344)

 

A buffer overflow was found in the KADM5 administration server (kadmind)

when it was used with an LDAP back end for the KDC database. A remote,

authenticated attacker could potentially use this flaw to execute arbitrary

code on the system running kadmind. (CVE-2014-4345)

 

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) call the

gss_process_context_token() function could 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 with 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)

 

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, using 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)

 

An information disclosure flaw was found in the way MIT Kerberos RPCSEC_GSS

implementation (libgssrpc) handled certain requests. An attacker could send

a specially crafted request to an application using libgssrpc to disclose a

limited portion of uninitialized memory used by that application.

(CVE-2014-9423)

 

Two buffer over-read flaws were found in the way MIT Kerberos handled

certain requests. A remote, unauthenticated attacker able to inject packets

into a client or server application's GSSAPI session could use either of

these flaws to crash the application. (CVE-2014-4341, CVE-2014-4342)

 

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An

attacker able to spoof packets to appear as though they are from an GSSAPI

acceptor could use this flaw to crash a client application that uses MIT

Kerberos. (CVE-2014-4343)

 

Red Hat would like to thank the MIT Kerberos project for reporting the

CVE-2014-5352, CVE-2014-9421, CVE-2014-9422, and CVE-2014-9423 issues. MIT

Kerberos project acknowledges Nico Williams for helping with the analysis

of CVE-2014-5352.

 

The krb5 packages have been upgraded to upstream version 1.12, which

provides a number of bug fixes and enhancements, including:

 

* Added plug-in interfaces for principal-to-username mapping and verifying

authorization to user accounts.

 

* When communicating with a KDC over a connected TCP or HTTPS socket, the

client gives the KDC more time to reply before it transmits the request to

another server. (BZ#1049709, BZ#1127995)

 

This update also fixes multiple bugs, for example:

 

* The Kerberos client library did not recognize certain exit statuses that

the resolver libraries could return when looking up the addresses of

servers configured in the /etc/krb5.conf file or locating Kerberos servers

using DNS service location. The library could treat non-fatal return codes

as fatal errors. Now, the library interprets the specific return codes

correctly. (BZ#1084068, BZ#1109102)

 

In addition, this update adds various enhancements. Among others:

 

* Added support for contacting KDCs and kpasswd servers through HTTPS

proxies implementing the Kerberos KDC Proxy (KKDCP) protocol. (BZ#1109919)

 

4. Solution:

 

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

correct these issues and add these enhancements.

 

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/):

 

1084068 - ipv6 address handling in krb5.conf

1102837 - Please backport improved GSSAPI mech configuration

1109102 - Kerberos does not handle incorrect Active Directory DNS SRV entries correctly

1109919 - Backport https support into libkrb5

1116180 - CVE-2014-4341 krb5: denial of service flaws when handling padding length longer than the plaintext

1118347 - ksu non-functional, gets invalid argument copying cred cache

1120581 - CVE-2014-4342 krb5: denial of service flaws when handling RFC 1964 tokens

1121789 - CVE-2014-4343: use-after-free crash in SPNEGO

1121876 - CVE-2014-4343 krb5: double-free flaw in SPNEGO initiators

1121877 - CVE-2014-4344 krb5: NULL pointer dereference flaw in SPNEGO acceptor for continuation tokens

1127995 - aggressive kinit timeout causes AS_REQ resent and subsequent OTP auth failure

1128157 - CVE-2014-4345 krb5: buffer overrun in kadmind with LDAP backend (MITKRB5-SA-2014-001)

1166012 - libkadmclnt SONAME change (8 to 9) in krb5 1.12 update

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)

1179863 - CVE-2014-9423 krb5: libgssrpc server applications leak uninitialized bytes (MITKRB5-SA-2015-001)

1184629 - kinit loops on principals on unknown error

 

6. Package List:

 

Red Hat Enterprise Linux Client (v. 7):

 

Source:

krb5-1.12.2-14.el7.src.rpm

 

x86_64:

krb5-debuginfo-1.12.2-14.el7.i686.rpm

krb5-debuginfo-1.12.2-14.el7.x86_64.rpm

krb5-libs-1.12.2-14.el7.i686.rpm

krb5-libs-1.12.2-14.el7.x86_64.rpm

krb5-pkinit-1.12.2-14.el7.x86_64.rpm

krb5-workstation-1.12.2-14.el7.x86_64.rpm

 

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

 

x86_64:

krb5-debuginfo-1.12.2-14.el7.i686.rpm

krb5-debuginfo-1.12.2-14.el7.x86_64.rpm

krb5-devel-1.12.2-14.el7.i686.rpm

krb5-devel-1.12.2-14.el7.x86_64.rpm

krb5-server-1.12.2-14.el7.x86_64.rpm

krb5-server-ldap-1.12.2-14.el7.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode (v. 7):

 

Source:

krb5-1.12.2-14.el7.src.rpm

 

x86_64:

krb5-debuginfo-1.12.2-14.el7.i686.rpm

krb5-debuginfo-1.12.2-14.el7.x86_64.rpm

krb5-libs-1.12.2-14.el7.i686.rpm

krb5-libs-1.12.2-14.el7.x86_64.rpm

krb5-pkinit-1.12.2-14.el7.x86_64.rpm

krb5-workstation-1.12.2-14.el7.x86_64.rpm

 

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

 

x86_64:

krb5-debuginfo-1.12.2-14.el7.i686.rpm

krb5-debuginfo-1.12.2-14.el7.x86_64.rpm

krb5-devel-1.12.2-14.el7.i686.rpm

krb5-devel-1.12.2-14.el7.x86_64.rpm

krb5-server-1.12.2-14.el7.x86_64.rpm

krb5-server-ldap-1.12.2-14.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 7):

 

Source:

krb5-1.12.2-14.el7.src.rpm

 

ppc64:

krb5-debuginfo-1.12.2-14.el7.ppc.rpm

krb5-debuginfo-1.12.2-14.el7.ppc64.rpm

krb5-devel-1.12.2-14.el7.ppc.rpm

krb5-devel-1.12.2-14.el7.ppc64.rpm

krb5-libs-1.12.2-14.el7.ppc.rpm

krb5-libs-1.12.2-14.el7.ppc64.rpm

krb5-pkinit-1.12.2-14.el7.ppc64.rpm

krb5-server-1.12.2-14.el7.ppc64.rpm

krb5-server-ldap-1.12.2-14.el7.ppc64.rpm

krb5-workstation-1.12.2-14.el7.ppc64.rpm

 

s390x:

krb5-debuginfo-1.12.2-14.el7.s390.rpm

krb5-debuginfo-1.12.2-14.el7.s390x.rpm

krb5-devel-1.12.2-14.el7.s390.rpm

krb5-devel-1.12.2-14.el7.s390x.rpm

krb5-libs-1.12.2-14.el7.s390.rpm

krb5-libs-1.12.2-14.el7.s390x.rpm

krb5-pkinit-1.12.2-14.el7.s390x.rpm

krb5-server-1.12.2-14.el7.s390x.rpm

krb5-server-ldap-1.12.2-14.el7.s390x.rpm

krb5-workstation-1.12.2-14.el7.s390x.rpm

 

x86_64:

krb5-debuginfo-1.12.2-14.el7.i686.rpm

krb5-debuginfo-1.12.2-14.el7.x86_64.rpm

krb5-devel-1.12.2-14.el7.i686.rpm

krb5-devel-1.12.2-14.el7.x86_64.rpm

krb5-libs-1.12.2-14.el7.i686.rpm

krb5-libs-1.12.2-14.el7.x86_64.rpm

krb5-pkinit-1.12.2-14.el7.x86_64.rpm

krb5-server-1.12.2-14.el7.x86_64.rpm

krb5-server-ldap-1.12.2-14.el7.x86_64.rpm

krb5-workstation-1.12.2-14.el7.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 7):

 

Source:

krb5-1.12.2-14.el7.src.rpm

 

x86_64:

krb5-debuginfo-1.12.2-14.el7.i686.rpm

krb5-debuginfo-1.12.2-14.el7.x86_64.rpm

krb5-devel-1.12.2-14.el7.i686.rpm

krb5-devel-1.12.2-14.el7.x86_64.rpm

krb5-libs-1.12.2-14.el7.i686.rpm

krb5-libs-1.12.2-14.el7.x86_64.rpm

krb5-pkinit-1.12.2-14.el7.x86_64.rpm

krb5-server-1.12.2-14.el7.x86_64.rpm

krb5-server-ldap-1.12.2-14.el7.x86_64.rpm

krb5-workstation-1.12.2-14.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-2014-4341

https://access.redhat.com/security/cve/CVE-2014-4342

https://access.redhat.com/security/cve/CVE-2014-4343

https://access.redhat.com/security/cve/CVE-2014-4344

https://access.redhat.com/security/cve/CVE-2014-4345

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-2014-9421

https://access.redhat.com/security/cve/CVE-2014-9422

https://access.redhat.com/security/cve/CVE-2014-9423

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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