MIT Kerberos 5 KDC NULL pointer dereference denial of service
| kerberos-kdc-null-pointer-dos (10099) |  Low Risk |
Description:
The MIT Kerberos Key Distribution Center (KDC) in MIT Kerberos 5 is vulnerable to a denial of service attack, caused by a NULL pointer dereference that can occur under certain configurations. A remote attacker who has successfully authenticated to the KDC can cause the KDC to crash by sending a malformed request.
Platforms Affected:
- Conectiva, Linux 8.0
- MandrakeSoft, Mandrake Linux 8.2 PPC
- MandrakeSoft, Mandrake Linux 8.2
- MandrakeSoft, Mandrake Linux 9.0
- MandrakeSoft, Mandrake Linux 9.1 PPC
- MandrakeSoft, Mandrake Linux 9.1
- MandrakeSoft, Mandrake Linux Corporate Server 2.1
- MandrakeSoft, Mandrake Linux Corporate Server 2.1 X86_64
- MandrakeSoft, Mandrake Multi Network Firewall 8.2
- MIT, Kerberos 5-1.2.1
- MIT, Kerberos 5-1.2.2
- MIT, Kerberos 5-1.2.3
- MIT, Kerberos 5-1.2.4
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Enterprise Linux 2.1 WS
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Linux 6.2
- RedHat, Linux 7
- RedHat, Linux 7.1
- RedHat, Linux 7.1 for iSeries
- RedHat, Linux 7.1 for pSeries
- RedHat, Linux 7.2
- RedHat, Linux 7.3
- RedHat, Linux 8.0
- RedHat, Linux Advanced Workstation 2.1 Itanium
- Sun, SEAM 1.0
- Sun, Solaris 2.6
- Sun, Solaris 7.0
- Sun, Solaris 8
- Sun, Solaris 9
Remedy:
Upgrade to the latest version of MIT Kerberos 5 (krb5-1.2.7 or later), available from the MIT Kerberos Web site. See References.
For Sun Solaris Enterprise Authentication Mechanism (SEAM) and Sun Solaris:
Apply the appropriate patch for your system, as listed below. Refer to Sun Alert ID: 50142 for more information. See References.
SPARC:
SEAM 1.0 for Solaris 2.6: 12534-02 or later
SEAM 1.0 for Solaris 7: 112536-02 or later
Solaris 8: 112237-07 (global) or later
Solaris 8: 112390-07 (domestic) or later
Solaris 9: 112908-04 or later
Intel:
SEAM 1.0 for Solaris 2.6: 112535-02 or later
SEAM 1.0 for Solaris 7: 112537-03 or later
Solaris 8: 112238-06 (global) or later
Solaris 8: 112240-06 (domestic) or later
For Red Hat Linux:
Upgrade to the latest krb5 package, as listed below. Refer to RHSA-2003:051-30 for more information. See References.
Red Hat 6.2: 1.1.1-40 or later
Red Hat 7.0, 7.1, and 7.2: 1.2.2-24 or later
Red Hat 7.3: 1.2.4-11 or later
Red Hat 8.0: 1.2.5-15 or later
For Conectiva Linux 8.0:
Upgrade to the latest version of krb5 (1.2.8-1U80_1cl or later), as listed in Conectiva Linux Security Announcement CLSA-2003:639. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
Denial of Service
References:
- CIAC Information Bulletin N-037, Multiple Vulnerabilities in Old Releases of MIT Kerberos at http://www.ciac.org/ciac/bulletins/n-037.shtml.
- Conectiva Linux Security Announcement CLSA-2003:639, krb5 at http://distro.conectiva.com/atualizacoes/?id=a&anuncio=000639.
- MIT Kerberos Web site, Kerberos: The Network Authentication Protocol at http://web.mit.edu/kerberos/www/.
- MIT krb5 Security Advisory 2003-001, Multiple vulnerabilities in old releases of MIT Kerberos at http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-001-multiple.txt.
- Sun Alert ID: 50142, Several Kerberos Applications are Vulnerable to a Denial of Service (DoS) at http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F50142&zone_32=category%3Asecurity.
- BID-6683: Kerberos Key Distribution Center Denial of Service Vulnerability
- CVE-2003-0058: MIT Kerberos V5 Key Distribution Center (KDC) before 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 dereference.
- MDKSA-2003:043: Updated krb5 packages fix multiple vulnerabilities
- MDKSA-2003:043-1: Updated krb5 packages fix multiple vulnerabilities
- RHSA-2003-051: Updated kerberos packages fix various vulnerabilities
- RHSA-2003-052: krb5 security update
- RHSA-2003-168: Updated kerberos packages fix various vulnerabilities
- US-CERT VU#661243: MIT Kerberos V5 KDC vulnerable to denial-of-service via null pointer dereference
Reported:
Sep 16, 2002
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