| Descripción: | Description:
The remote host is missing updates announced in
advisory RHSA-2003:052.
Kerberos is a network authentication system. The MIT Kerberos team
released an advisory describing a number of vulnerabilities that affect the
kerberos packages shipped by Red Hat.
An integer signedness error in the ASN.1 decoder before version 1.2.5
allows remote attackers to cause a denial of service via a large unsigned
data element length, which is later used as a negative value. The Common
Vulnerabilities and Exposures project has assigned the name CVE-2002-0036
to this issue.
The Key Distribution Center (KDC) before version 1.2.5 allows remote,
authenticated, attackers to cause a denial of service (crash) on KDCs
within the same realm via a certain protocol request that:
- causes a null pointer dereference (CVE-2003-0058).
- causes the KDC to corrupt its heap (CVE-2003-0082).
A vulnerability in Kerberos before version 1.2.3 allows users from
one realm to impersonate users in other realms that have the same
inter-realm keys (CVE-2003-0059).
The MIT advisory for these issues also mentions format string
vulnerabilities in the logging routines (CVE-2003-0060). Previous versions
of the kerberos packages from Red Hat already contain fixes for this issue.
Vulnerabilities have been found in the implementation of support for
triple-DES keys in the implementation of the Kerberos IV authentication
protocol included in MIT Kerberos (CVE-2003-0139).
Vulnerabilities have been found in the Kerberos IV authentication protocol
which allow an attacker with knowledge of a cross-realm key that is shared
with another realm to impersonate any principal in that realm to any
service in that realm. This vulnerability can only be closed by disabling
cross-realm authentication in Kerberos IV (CVE-2003-0138).
Vulnerabilities have been found in the RPC library used by the kadmin
service in Kerberos 5. A faulty length check in the RPC library exposes
kadmind to an integer overflow which can be used to crash kadmind
(CVE-2003-0028).
All users of Kerberos are advised to upgrade to these errata packages,
which disable cross-realm authentication by default for Kerberos IV and
which contain backported patches to correct these issues.
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-2003-052.html
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-005-buf.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-004-krb4.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-003-xdr.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-001-multiple.txt
Risk factor : High
CVSS Score:
7.5
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