MIT Kerberos 5 KDC NULL pointer dereference denial of service
| kerberos-kdc-null-pointer-dos (10099) |  Medium 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.
*CVSS:
| Base Score: | 2.1 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Required |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 1.6 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
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.
References:
- CIAC Information Bulletin N-037: Multiple Vulnerabilities in Old Releases of MIT Kerberos.
- Conectiva Linux Security Announcement CLSA-2003:639: krb5.
- MIT Kerberos Web site: Kerberos: The Network Authentication Protocol.
- MIT krb5 Security Advisory 2003-001: Multiple vulnerabilities in old releases of MIT Kerberos.
- Sun Alert ID: 50142: Several Kerberos Applications are Vulnerable to a Denial of Service (DoS).
- 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
Platforms Affected:
- Conectiva Linux 8.0
- MandrakeSoft Mandrake Linux 8.2
- MandrakeSoft Mandrake Linux 8.2 PPC
- MandrakeSoft Mandrake Linux 9.0
- MandrakeSoft Mandrake Linux 9.1
- MandrakeSoft Mandrake Linux 9.1 PPC
- MandrakeSoft Mandrake Linux Corporate Server 2.1 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 2.1
- 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 WS
- RedHat Enterprise Linux 2.1 AS
- RedHat Enterprise Linux 2.1 ES
- 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
Reported:
Sep 16, 2002
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