Fedora Core 1 : krb5-1.3.3-6 (2004-149)

Critical Nessus Plugin ID 13710


The remote Fedora Core host is missing a security update.


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.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected packages.

See Also


Plugin Details

Severity: Critical

ID: 13710

File Name: fedora_2004-149.nasl

Version: $Revision: 1.18 $

Type: local

Agent: unix

Published: 2004/07/23

Modified: 2015/10/21

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Vulnerability Information

CPE: p-cpe:/a:fedoraproject:fedora:krb5-debuginfo, p-cpe:/a:fedoraproject:fedora:krb5-devel, p-cpe:/a:fedoraproject:fedora:krb5-libs, p-cpe:/a:fedoraproject:fedora:krb5-server, p-cpe:/a:fedoraproject:fedora:krb5-workstation, cpe:/o:fedoraproject:fedora_core:1

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2004/06/04

Reference Information

CVE: CVE-2004-0523

FEDORA: 2004-149