| Description: | Description:
The remote host is missing updates announced in
advisory RHSA-2010:0925.
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).
Multiple checksum validation flaws were discovered in the MIT Kerberos
implementation. A remote attacker could use these flaws to tamper with
certain Kerberos protocol packets and, possibly, bypass authentication or
authorization mechanisms and escalate their privileges. (CVE-2010-1323,
CVE-2010-1324, CVE-2010-4020)
Red Hat would like to thank the MIT Kerberos Team for reporting these
issues.
This update also fixes the following bug:
* When attempting to perform PKINIT pre-authentication, if the client had
more than one possible candidate certificate the client could fail to
select the certificate and key to use. This usually occurred if certificate
selection was configured to use the value of the keyUsage extension, or if
any of the candidate certificates did not contain a subjectAltName
extension. Consequently, the client attempted to perform pre-authentication
using a different (usually password-based) mechanism. (BZ#644825)
All krb5 users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the updated
packages, the krb5kdc daemon will be restarted automatically.
Solution:
Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date
http://rhn.redhat.com/errata/RHSA-2010-0925.html
http://www.redhat.com/security/updates/classification/#important
http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2010-007.txt
Risk factor : Medium
CVSS Score:
4.3
|
