Red Hat ENTERPRISE 5.4 RELEASE NOTES, Manual

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Chapter 1. Package Updates
144
Negotiation (SPNEGO) mechanism is used by GSS-API peers to choose from a common set of
security mechanisms.
An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT
Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos
library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer.
(
CVE-2009-0846
1100
)
Multiple input validation flaws were found in the MIT Kerberos GSS-API library's implementation of the
SPNEGO mechanism. A remote attacker could use these flaws to crash any network service utilizing
the MIT Kerberos GSS-API library to authenticate users or, possibly, leak portions of the service's
memory. (
CVE-2009-0844
1101
,
CVE-2009-0845
1102
)
All krb5 users should upgrade to these updated packages, which contain backported patches to
correct these issues. All running services using the MIT Kerberos libraries must be restarted for the
update to take effect.
1.112.2. RHBA-2009:1378: bug fix and enhancement update
Updated krb5 packages which fix several bugs and adds enhancements are now available for Red Hat
Enterprise Linux 5.
Kerberos 5 is a network authentication system which authenticates clients and servers to each other
using symmetric key encryption and a trusted third party, the KDC.
These updated packages address the following bugs:
• one of the error messages printed by the "ksu" command contained a spelling error ("geting"). This
has been corrected. (
BZ#462890
1103
)
• several dozen spelling errors across 21 krb5-related manual pages were corrected. (
BZ#499190
1104
)
• this update no longer attempts to create a keytab for use by the kadmin service when the service is
started; doing so is redundant and may interfere with third-party password-changing services such
as those provided by IPA. (
BZ#473151
1105
)
• with this update an attempt to load a database dump into a database which has not been created
will cause kdb5_util to create the database. (
BZ#442879
1106
)
• this update now correctly reports an error if an attempt to use rcp to copy data to a remote system
encounters an error as the file is closed. (
BZ#461902
1107
)
These new packages also add the following enhancements:
• the "ksu" command can now perform PAM account and session management for the target user.
(
BZ#477033
1108
)
• the Kerberos-aware rsh, rlogin, telnet, and ftp services can now set the PAM_RHOST item for users
who log in or connect to a server remotely. (
BZ#479071
1109
)
All users of the krb5 workstation utilities and services are advised to update to these packages which
address these issues and add this enhancement.
1100
https://www.redhat.com/security/data/cve/CVE-2009-0846.html
1101
https://www.redhat.com/security/data/cve/CVE-2009-0844.html
1102
https://www.redhat.com/security/data/cve/CVE-2009-0845.html