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Updated kerberos packages fix a number of vulnerabilities found in MIT
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
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
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.
See also :
Update the affected packages.
Risk factor :
High / CVSS Base Score : 7.5
Family: Red Hat Local Security Checks
Nessus Plugin ID: 12364 ()
CVE ID: CVE-2002-0036CVE-2003-0028CVE-2003-0058CVE-2003-0059CVE-2003-0072CVE-2003-0082CVE-2003-0138CVE-2003-0139CVE-2004-0772
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