[RHSA-2012:0306-03] Low: krb5 security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Low: krb5 security and bug fix update

Advisory ID: RHSA-2012:0306-03

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0306.html

Issue date: 2012-02-21

CVE Names: CVE-2011-1526

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1. Summary:

 

Updated krb5 packages that fix one security issue and various bugs are now

available for Red Hat Enterprise Linux 5.

 

The Red Hat Security Response Team has rated this update as having low

security impact. A Common Vulnerability Scoring System (CVSS) base score,

which gives a detailed severity rating, is available from the CVE link in

the References section.

 

2. Relevant releases/architectures:

 

RHEL Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - 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).

 

It was found that ftpd, a Kerberos-aware FTP server, did not properly drop

privileges. On Red Hat Enterprise Linux 5, the ftpd daemon did not check

for the potential failure of the effective group ID change system call. If

the group ID change failed, a remote FTP user could use this flaw to gain

unauthorized read or write access to files that are owned by the root

group. (CVE-2011-1526)

 

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

issue. Upstream acknowledges Tim Zingelman as the original reporter.

 

This update also fixes the following bugs:

 

* Due to a mistake in the Kerberos libraries, a client could fail to

contact a Key Distribution Center (KDC) or terminate unexpectedly if the

client had already more than 1024 file descriptors in use. This update

backports modifications to the Kerberos libraries and the libraries use

the poll() function instead of the select() function, as poll() does not

have this limitation. (BZ#701444)

 

* The KDC failed to release memory when processing a TGS (ticket-granting

server) request from a client if the client request included an

authenticator with a subkey. As a result, the KDC consumed an excessive

amount of memory. With this update, the code releasing the memory has been

added and the problem no longer occurs. (BZ#708516)

 

* Under certain circumstances, if services requiring Kerberos

authentication sent two authentication requests to the authenticating

server, the second authentication request was flagged as a replay attack.

As a result, the second authentication attempt was denied. This update

applies an upstream patch that fixes this bug. (BZ#713500)

 

* Previously, if Kerberos credentials had expired, the klist command could

terminate unexpectedly with a segmentation fault when invoked with the -s

option. This happened when klist encountered and failed to process an entry

with no realm name while scanning the credential cache. With this update,

the underlying code has been modified and the command handles such entries

correctly. (BZ#729067)

 

* Due to a regression, multi-line FTP macros terminated prematurely with a

segmentation fault. This occurred because the previously-added patch failed

to properly support multi-line macros. This update restores the support for

multi-line macros and the problem no longer occurs. (BZ#735363, BZ#736132)

 

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

resolve these issues.

 

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/kb/docs/DOC-11259

 

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

 

701444 - Fix libkrb5 to work when > 1024 file descriptors are in use

708516 - memory leak during kdc TGS request

711419 - CVE-2011-1526 krb5, krb5-appl: ftpd incorrect group privilege dropping (MITKRB5-SA-2011-005)

729067 - klist -s segfaults with expired credentials

750823 - Newly introduced defect into krb5

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-70.el5.src.rpm

 

i386:

krb5-debuginfo-1.6.1-70.el5.i386.rpm

krb5-libs-1.6.1-70.el5.i386.rpm

krb5-workstation-1.6.1-70.el5.i386.rpm

 

x86_64:

krb5-debuginfo-1.6.1-70.el5.i386.rpm

krb5-debuginfo-1.6.1-70.el5.x86_64.rpm

krb5-libs-1.6.1-70.el5.i386.rpm

krb5-libs-1.6.1-70.el5.x86_64.rpm

krb5-workstation-1.6.1-70.el5.x86_64.rpm

 

RHEL Desktop Workstation (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-70.el5.src.rpm

 

i386:

krb5-debuginfo-1.6.1-70.el5.i386.rpm

krb5-devel-1.6.1-70.el5.i386.rpm

krb5-server-1.6.1-70.el5.i386.rpm

krb5-server-ldap-1.6.1-70.el5.i386.rpm

 

x86_64:

krb5-debuginfo-1.6.1-70.el5.i386.rpm

krb5-debuginfo-1.6.1-70.el5.x86_64.rpm

krb5-devel-1.6.1-70.el5.i386.rpm

krb5-devel-1.6.1-70.el5.x86_64.rpm

krb5-server-1.6.1-70.el5.x86_64.rpm

krb5-server-ldap-1.6.1-70.el5.x86_64.rpm

 

Red Hat Enterprise Linux (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/krb5-1.6.1-70.el5.src.rpm

 

i386:

krb5-debuginfo-1.6.1-70.el5.i386.rpm

krb5-devel-1.6.1-70.el5.i386.rpm

krb5-libs-1.6.1-70.el5.i386.rpm

krb5-server-1.6.1-70.el5.i386.rpm

krb5-server-ldap-1.6.1-70.el5.i386.rpm

krb5-workstation-1.6.1-70.el5.i386.rpm

 

ia64:

krb5-debuginfo-1.6.1-70.el5.i386.rpm

krb5-debuginfo-1.6.1-70.el5.ia64.rpm

krb5-devel-1.6.1-70.el5.ia64.rpm

krb5-libs-1.6.1-70.el5.i386.rpm

krb5-libs-1.6.1-70.el5.ia64.rpm

krb5-server-1.6.1-70.el5.ia64.rpm

krb5-server-ldap-1.6.1-70.el5.ia64.rpm

krb5-workstation-1.6.1-70.el5.ia64.rpm

 

ppc:

krb5-debuginfo-1.6.1-70.el5.ppc.rpm

krb5-debuginfo-1.6.1-70.el5.ppc64.rpm

krb5-devel-1.6.1-70.el5.ppc.rpm

krb5-devel-1.6.1-70.el5.ppc64.rpm

krb5-libs-1.6.1-70.el5.ppc.rpm

krb5-libs-1.6.1-70.el5.ppc64.rpm

krb5-server-1.6.1-70.el5.ppc.rpm

krb5-server-ldap-1.6.1-70.el5.ppc.rpm

krb5-workstation-1.6.1-70.el5.ppc.rpm

 

s390x:

krb5-debuginfo-1.6.1-70.el5.s390.rpm

krb5-debuginfo-1.6.1-70.el5.s390x.rpm

krb5-devel-1.6.1-70.el5.s390.rpm

krb5-devel-1.6.1-70.el5.s390x.rpm

krb5-libs-1.6.1-70.el5.s390.rpm

krb5-libs-1.6.1-70.el5.s390x.rpm

krb5-server-1.6.1-70.el5.s390x.rpm

krb5-server-ldap-1.6.1-70.el5.s390x.rpm

krb5-workstation-1.6.1-70.el5.s390x.rpm

 

x86_64:

krb5-debuginfo-1.6.1-70.el5.i386.rpm

krb5-debuginfo-1.6.1-70.el5.x86_64.rpm

krb5-devel-1.6.1-70.el5.i386.rpm

krb5-devel-1.6.1-70.el5.x86_64.rpm

krb5-libs-1.6.1-70.el5.i386.rpm

krb5-libs-1.6.1-70.el5.x86_64.rpm

krb5-server-1.6.1-70.el5.x86_64.rpm

krb5-server-ldap-1.6.1-70.el5.x86_64.rpm

krb5-workstation-1.6.1-70.el5.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-2011-1526.html

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

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-005.txt

 

8. Contact:

 

The Red Hat security contact is . More contact

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

 

Copyright 2012 Red Hat, Inc.

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