Family: Red Hat Local Security Checks --> Category: infos
RHSA-2004-236: krb Vulnerability Scan
Vulnerability Scan Summary
Check for the version of the krb packages
Detailed Explanation for this Vulnerability Test
Updated Kerberos 5 (krb5) packages which correct buffer overflows in the
krb5_aname_to_localname function are now available.
Kerberos is a network authentication system.
Bugs have been fixed in the krb5_aname_to_localname library function.
Specifically, buffer overflows were possible for all Kerberos versions up
to and including 1.3.3. The krb5_aname_to_localname function translates a
Kerberos principal name to a local account name, typically a UNIX username.
This function is frequently used when performing authorization checks.
If configured with mappings from particular Kerberos principals to
particular UNIX user names, certain functions called by
krb5_aname_to_localname will not properly check the lengths of buffers
used to store portions of the principal name. If configured to map
principals to user names using rules, krb5_aname_to_localname would
consistently write one byte past the end of a buffer allocated from the
heap. The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CVE-2004-0523 to this issue.
Only configurations which enable the explicit mapping or rules-based
mapping functionality of krb5_aname_to_localname() are vulnerable.
These configurations are not the default.
Users of Kerberos are advised to upgrade to these erratum packages which
contain backported security patches to correct these issues.
Solution : http://rhn.redhat.com/errata/RHSA-2004-236.html
Threat Level: High
Click HERE for more information and discussions on this network vulnerability scan.