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Date: | Wed, 7 Apr 2010 13:30:42 -0500 |
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Synopsis: Important: krb5 security and bug fix update
Issue date: 2010-04-06
CVE Names: CVE-2010-0629
A use-after-free flaw was discovered in the MIT Kerberos administration
daemon, kadmind. A remote, authenticated attacker could use this flaw to
crash the kadmind daemon. Administrative privileges are not required to
trigger this flaw, as any realm user can request information about their
own principal from kadmind. (CVE-2010-0629)
This update also fixes the following bug:
* when a Kerberos client seeks tickets for use with a service, it must
contact the Key Distribution Center (KDC) to obtain them. The client
must also determine which realm the service belongs to and it typically
does this with a combination of client configuration detail, DNS
information and guesswork.
If the service belongs to a realm other than the client's, cross-realm
authentication is required. Using a combination of client configuration
and guesswork, the client determines the trust relationship sequence
which forms the trusted path between the client's realm and the
service's realm. This may include one or more intermediate realms.
Anticipating the KDC has better knowledge of extant trust relationships,
the client then requests a ticket from the service's KDC, indicating it
will accept guidance from the service's KDC by setting a special flag in
the request. A KDC which recognizes the flag can, at its option, return
a ticket-granting ticket for the next realm along the trust path the
client should be following.
If the ticket-granting ticket returned by the service's KDC is for use
with a realm the client has already determined was in the trusted path,
the client accepts this as an optimization and continues. If, however,
the ticket is for use in a realm the client is not expecting, the client
responds incorrectly: it treats the case as an error rather than
continuing along the path suggested by the service's KDC.
For this update, the krb5 1.7 modifications which allow the client to
trust such KDCs to send them along the correct path, resulting in the
client obtaining the tickets it originally desired, were backported to
krb 1.6.1 (the version shipped with Scientific Linux 5.5). (BZ#578540)
All running KDC services must be restarted for the update to take effect.
SL 5.x
SRPMS:
krb5-1.6.1-36.el5_5.2.src.rpm
i386:
krb5-devel-1.6.1-36.el5_5.2.i386.rpm
krb5-libs-1.6.1-36.el5_5.2.i386.rpm
krb5-server-1.6.1-36.el5_5.2.i386.rpm
krb5-workstation-1.6.1-36.el5_5.2.i386.rpm
x86_64:
krb5-devel-1.6.1-36.el5_5.2.i386.rpm
krb5-devel-1.6.1-36.el5_5.2.x86_64.rpm
krb5-libs-1.6.1-36.el5_5.2.i386.rpm
krb5-libs-1.6.1-36.el5_5.2.x86_64.rpm
krb5-server-1.6.1-36.el5_5.2.x86_64.rpm
krb5-workstation-1.6.1-36.el5_5.2.x86_64.rpm
-Connie Sieh
-Troy Dawson
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